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1. Assigns all waveplate positions to an assumed 0 angular position Then moves all waveplates to initialization position tapping sound Alignment to 0 occurs at current scan rate When completed the display shows the waveplate position as 0 1 888 91 FIBER toll free F i be rCo ntro 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 20 4 2 6 Adjusting Rotational Speed RATE The RATE key alters the angular speed in which all the waveplates of the chosen channel move The MPC1 may be adjusted to move rapidly or in a slow smooth progression to the assigned waveplate position The relationship between the RATE identifier and the angular velocity in Stokes 3 space is shown in Figure 7 a convenient tabular form of the graph appears at the end of this section 4 2 6 in Table 6 RATE Setting vs Waveplate Rotational Velocity Velocity Deg sec Waveplate Rotational 0 5 10 15 20 25 RATE Setting Figure 7 RATE value vs angular velocity of Lef vre waveplates for the MPC1 series For the MPC1 01 pressing the RATE key initiates a menu whereupon the rotation the right most encoder alters the rate value Higher numeric values represent higher waveplates angular velocities Conversely lower values represent slower Lefevre loop i e waveplate angular rotation All three waveplates associated with this
2. In general the MPC1 can be controlled serially in LabView or any other program using a similar architecture to those outlined under the GPIB subsection The programmer may find it convenient to use the ACK handshaking features of the RS 232 easier to implement than reading the OPC command lt is notable that because of the serial monitor user interface and the echo back features of the monitor program it is necessary to PARSE for the return codes from MPC1 To clarify it is necessary for the programmer to process a line of returned text from MPC1 to pick out the return value from surrounding text 5 6 MPC1 Binary Transparent Mode Remote Programming Transparent mode utilizes a SEND ONLY structure which compresses an abbreviated command set into two bytes for transmission to the MPC1 Using this technique very rapid motion movements may be made between an application program and the MPC1 1 888 91 FIBER toll free F i be rCo ntrol 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 59 After every Motion request which is processed the ACK character is transmitted in exactly the same manner described earlier in this section Sample command encapsulation C source code is also published later in this section The Transparent mode is entered via a serial standard mode command TR MPC1 will prevent the processing of the TR command
3. On all models exiting the RATE menu by pressing the CENTER key will save the value selected in the RATE menu into nonvolatile memory It should be noted that the value selected in the RATE menu is automatically recalled each time the MPC1 is powered up The rate value can be set from 1 20 from the front control panel This provides an approximate physical angular rotational speed of the waveplate from 10 sec RATE 1 on the low side to 1440 sec RATE 20 on the high side In the optical domain when viewed in Stokes 3 space the effective angular velocity is twice the physical rotational velocity or 2880 per second 1 888 91 FIBER toll free F i be rCo ntro 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 22 The almost exponential relationship provides the end user with a fine resolution at the slow rotational movement settings providing increased opportunity for clean curve generation on a wide range of polarimeters even on early generation polarimeters with relatively slow Poincare graphical renderings built on Visual Basic platforms To adjust the RATE of the MPC1 02 and MPC1 M Under the display corresponding to the desired channel pair push the RATE key once then rotate either the left most or right most encoder to desired rate then press JCENTER Rotational rates for that channel pair are listed above the outer en
4. LabView GPIB WAIT RQS C VB ibread LabView GPIB READ Further information on the C VB GPIB API is available from your GPIB card vendor 1 888 91 FIBER toll free F i be rCo ntrol 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 57 5 5 MPC1 Serial RS 232 Remote Programming Serial support on the MPC1 includes the same command set provided to GPIB with a few additions 1 A monitor program is provided by MPC1 to allow remote control via a terminal program such as Microsofts HyperTerminal Using any PC based terminal utility the command set described in section three The serial monitor program has been configured to provide echo back and line command correction 2 When using Serial mode an ACK character is dispatched on completion of a waveplate motion command This ACK character character ascii 6 is issued on completion of a motion command and MPC1 returns to the idle state To clarify if three successive motion commands are issued to MPC1 axis X axis Y and axis Z an ACK will be submitted on completion of all motion Hence the host computer in this situation should expect only a single ACK character lt is important to note an illegitimate move command will not return an ACK For example a command intended to move a waveplate to a position in which the waveplate already resides produces no ACK response In the event of optic
5. This would be especially evident for very large axis displacement driven at a slow motion rate 5 2 3 Re Centering All Waveplates Single Channel Syntax CEN Multiple Channel Syntax CEN1 or CEN2 This simply will assign all waveplates to the 0 position 1 888 91 FIBER toll free F i be rCo ntrol 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 41 The CEN command can be compared to a macro consisting of X 0 Y 0 and Z 0 On the multiple channel model CENA centers channel A while CEN2 centers channel 2 5 2 4 Angular Velocity Control of MPC1 Lefevre Waveplates Single Channel Syntax RATE nn Multiple Channel Syntax RATE1 nn RATE2 nn nn 0 20 This value describes the time constant between steps of each axis stepper motor It is notable the angular velocity value is described using the chart from Figure 2 Caution should be exercised to ensure sufficient settle time for the Lefevre waveplates after a movement at high speed Insufficient settle time or whip sawing the waveplate may result in the introduction of drift in the waveplate While such action will not damage MPC1 it could introduce error into the experimental setup Cycling of power or issuance of a RST command would be required to correct this in the event of its occurrence settle time is guaranteed by reading the GPIB Status byte from MPC1 following a
6. computer control via GPIB 488 2 and RS 232 Stable long term preservation of output SOPs is inherent in this technique The MPC1 is capable of altering the SOP over a wide range of wavelengths while minimally impacting the other optical parameters e Ultra low insertion loss e Ultra low reflection and e Ultra low PDL Based on a technique originally developed by Herve C Lefevre at Stanford University the MPC1 utilizes stress induced birefringence to alter and control the SOP of the polarized components of light With one continuous length of optical fiber formed into individual coils commonly referred to as Lefevre loops multiple independent sets of fiber loops are secured to separate paddles Each paddle with its corresponding set of fiber loops act as fractional waveplates These waveplates can be rotated independently Adjustments in the angular orientation of these paddles alter the SOP of the incident light and provide complete coverage of the Poincare sphere 1 888 91 FIBER toll free F i be rCo ntrol 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 3 2 Applications The control and manipulation of the SOP is fundamental within the field of optics While polarized light constrained within optical fiber is easy to move from one part of the laboratory to another any movement of the fiber causes the SOP to be altered For those involved in fibe
7. gt 99 00 Keep in mind the resolution of the axis rotation is finite The step resolution is 0 15 Hence the request submitted to MPC1 will be rounded up to the nearest 0 15 1 888 91 FIBER toll free F i be rCo ntro 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 38 The syntax is defined as follows X Y Z defines the axis c defines the channel Normally this is either 1 or 2 The indicates to MPC1 the command is a channel assignment Finally the argument succeeds As a multiple channel MPC1 example X1 12 15 assigns channel 1 X axis to angle 12 15 Likewise Z2 22 50 assigns channel 2 Z axis to position 22 50 The same example on a single channel MPC1 X 12 15 assigns the X axis to angle 12 15 Again Z 22 50 assigns the Z axis to position 22 50 For backwards compatibility from the MPC1 multiple channel to the MPC1 single channel it is legitimate to assign a paddle command with the syntax X 12 15 lf the channel assignment is not specified MPC1 will default the value to Channel 1 When the command is issued to MPC1 the axis of choice will immediately begin motion Subsequent commands may be sent to other waveplates however an end of command character LF or character 10 must separate each request lf a subsequent assignment is made to a given axis MPC1 will
8. 1 to 30 do not choose 7 Programs are saved in non volatile memory Default address MPC1 01 MPC1 02 is 4 MPC1 M is 4 ch 1 2 and 5 ch 3 4 1 888 91 FIBER_ toll free F i be rCo ntro 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web
9. 6 0 s 75 00 44 40 59 55 E FiberControl HO Os PROGRAM STATE Io Eo ol a re orb PROGRAM ENTER GWSELEOT SAVE BD Fibercontrol MPC1 M POLARIZATION CONTROLLER 15 Is 15 s 6 0 s 15 s 15 s 6 0 s 75 00 44 40 59 55 75 00 44 40 59 55 E a o o OPTICAL CH1 CH2 CH3 CH4 a wa a yg i EO ON i HO ON OGRAM SS L E gt l C i m CENTER RECALL guney LOCAL AUTO SCAN ENTER sai CENTER m SHIFT FOCAL potest ECAN A GPI PRO CH SELECT SAVE GPI PROGRAI CH SELECT SAVE ENTER Figure 4 The front panel displays of the MPC1 family of products The single channel MPC1 01 Top the two channel MPC1 02 Middle and the four channel MPC1 M Bottom FiberControl Lightwave Polarization Solutions 1 888 91 FIBER toll free 732 332 1860 telephone 732 332 1861 facsimile info fibercontrol com email www fibercontrol com web The rear panel provides the easy access for connecting line power via IEC 320 and control cabling i e EIA RS232 and GPIB IEEE 488 2 It also contains the warning labels and fusing information In the sections to follow when a three dimensional box surrounds a word It represents a key or button on the front panel Please note sections of text surrounded by boxes with 10 gray level similar to this example periodically listed throughout the manual are intended as concise summaries to aid the use
10. 9 1 AutoScan Overvie W 0 0 0 ceccececeececeeceececeeceeeeceeeeceeeeceeaesetaesenaes 25 4 2 9 2 AutoScan Mode SOP Scramble cceceeceeceeeeseeseeeeeeeees 25 4 2 9 3 AutoScan Mode User Defined ccc eeceeeeceeceeeeeeeceeeeeeeees 26 4 2 9 4 Programming and AutoScan Program ccccceseeeeeeeeeeeeees 27 4 2 9 5 Example AutoScan ProQram cccsccccsescecseeceeeeeeeeseeeeeseeeeeaees 29 4 2 9 6 Recalling an AutoScan PrOgram sccccseseecseeeeseeeeeeeeeeeenees 29 AN UUO e E EE E 30 4 Mg 202 isl ace 2 ee ee E E ee 30 5 Remote Operation The MPC1 Command Set c ceeeeeeee 32 Di CIS I EE E E diangtenamemuessauracia beta saeaumueaaseaniens 32 5 1 1 GPIB COMmlQUrAV OM c ccetersatececacteennseteeccesdecehacteseeeaneeiah eeeesteete 32 See FCO IC QUO eaa EE aes 34 5 2 Command Structure of MPC1 2 0 cecccccsececceeceeseeseeseeeeeseeeesseeeesaees 35 5 2 1 Waveplate Motion Control of MPC1 ccccceccecceeseeeeeeeeeeeeeeeeees 37 32 2 NOU Ol AXIS FO SIMON saesae 39 5 2 3 Re Centering All Waveplates cccceccccsseeesseeeeeseeeeeseeeseeeeeens 40 5 2 4 Angular Velocity Control of MPC1 Lefevre Waveplates 41 5 2 5 Inquiry of Assigned Fale sic iiccchccshexcsctccincnaticrstinnacaiaestinchamadebetenceateius 42 5 2 6 Remote Invocation of Auto Mode and Scramble Mode 42 5 3 IEEE 488 2 Command Status Support ccceceeeeeeeeeeeeeeeeeeeeeeeneeeees 43 1 888 91
11. Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 49 Specifics of operation entail the following Step 1 Execution of a cycle begins with a read of the toggle switch Based on the Boolean condition of this switch commands will be sent to either channel A or to channel B Step 2 A command string is assembled and dispatched via GPIB to the MPC1 Notice the String Concatenate function is used to add a necessary LF Line Feed to the end of the MPC1 command When the command is assembled it is dispatched through the GPIB interface for processing by the MPC1 pO 2 0S ee OOOO Ooo oo GPIB Address the Asis assignment Lineteed The Termination Character FO OOGOOGOOGOOOOOOCOOOOOOO0OD Figure 13 Annotated string assembly for delivery to the GPIB port in Labview This string concatenation is from the single channel version of MPC1 Step 2 will prompt MPC1 to begin moving the first Lefevre waveplate to 99 1 888 91 FIBER toll free F i be rCo ntro 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 90 Step 3 The sub vi named CONDITIONAL GPIB DELAY vi is called This sub vi is a simple but is necessary to ensure MPC1 operates in a predictable manner Operation of CONDITIONAL is as follows 1 Oe Ceo Lee a 0 0 3 Gece eee ee GPIB Address Figure 14 Output String co
12. MPC1 a few examples are PDL system and component measurements Polarization stabilization with appropriate feedback Low medium speed polarization scrambler As a component in a PMD emulator or compensator EDFA noise figure measurements to remove the input signal Semiconductor optical amplifiers measurements Interferometric experiments Coherence sources and receivers and General use throughout the laboratory 1 888 91 FIBER toll free F i be rCo ntrol 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 11 4 Front and Rear Panel Description 4 1 General The MPC1 Polarization Controller provides high performance polarization control together with a flexible and easy to use user interfaces The front and rear panel interfaces enable the user to perform all operations By coupling an alphanumeric LCD display with an intuitive front panel control system the MPC1 s core functionality may be used with minimal instruction The MPC1 also features nonvolatile memory via EEPROM storing critical system information and user settings for later recall even after power is removed from the instrument MPC1 01 POLARIZATION CONTROLLER 15 js 15 s 6 0 s 75 00 44 40 59 55 gt FiberControl POWER PROGRAM STATE gt E E l T pee An To aea ROG MPC1 02 POLARIZATION CONTROLLER 15 ls 15 s
13. and teEMPerature cccceccceccseccseeeceeeeceeceeeceeeeeeeeseeeseeesaees 6 Table 4 Physical characteristics of the MPC1 cc eccceccceeeceeeeeeeeeseeeeeeeeaees 6 Table 5 Angular rotational movement per detent and the corresponding display INCI CATION cc cece ecceeceecceeteeeeeeeeeeceeeeeeeueceeceeeaeeeeeeeetaeeeeeeeeteeeeueeeeteeeseeseetanees 18 Table 6 A convenient tabular form showing how the RATE setting corresponds to the Stokes angular velocity SCC ccccccceecccesceceeeeceeeeaeeeeeeeaneeeauees 22 Table 7 Hardware settings for RS 232 COMMUNICATION cceceeeeeeeeeeeeeeee es 34 Table 8 RS 232 pin assignments for MPC1 cccceecececeeeeeeeseeeseeeeeeeeeanees 34 Table 9 Standard IEEE 488 2 status byte bit assignments ccccseeeeeeeeees 45 Table 10 Detailed IEEE 488 2 bit assignments cccccccsececeeeceeeeeeeeseeeeaes 45 1 888 91 FIBER_ toll free FiberControl ee eee Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web XIV Figures Figure 1 One of the two tapped front enclosure housing bezels part MPC1 HOO Oli satnsonguseesneuy tne mnmesnntiessusnnenseonaysasdosncincasnceisusesungosupessnspeimesenosonteesuaege moe 2 Figure 2 Rack mount mounting frame part MPC1 18002 cceeeeceeeeeee ees 3 Figure 3 An example showing the rotation of a single fractional waveplate displayed as a polarimetric plot on
14. com web 44 The following standard commands are supported by MPC1 to maintain compatibility with the IEEE 488 2 command set Traditionally the asterisk is used before each IEEE 488 2 command MPC1 accepts IEEE 488 2 commands both with and without the leading asterisk CLS Clears status byte to default of MPC1 when issued by host to MPC1 OPC Operation Complete query MPC1 responds with 1 or 0 1 ASCII 49 Operation COMPLETE 0 ASCII 48 Operation NOT COMPLETE The OPC inquiry is an excellent method for handshaking a series of movement commands When a motion command is submitted to MPC1 it is wise to poll the MPC1 via the OPC inquiry When OPC returns a 1 a subsequent motion command can be sent to MPC1 5 3 1 Status Byte Register Control Mechanisms SRE n This is the Status Byte mask assignment The SRE command expects a mask value in decimal The valid range of values is SRE 0 gt SRE 255 This command is very closely tied to the STB Command Further operational specifics are outlined in the STB Command explanation STB Displays the contents of status byte as a decimal value This command performs a similar function to a Serial Poll However unlike the Serial Poll response the STB Applies the mask specified by the SRE command The response is an eight bit byte containing a pattern describing the instrument status For the MPC1 the status byte describes whether the MPC1 is busy wheth
15. current program and current interval During the programming of user programs the resolution buttons the pressing in of the encoders are active however the resolution setting is not displayed 1 888 91 FIBER toll free F i be rCo ntro 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 28 At any time during the programming procedure pressing the AutoScan key terminates the process The current interval is saved and the AutoScan menu is exited Thus it is possible to configure an AutoScan routine to use less than 16 intervals To do this configure all intervals that are of interest Then program the unwanted intervals to the last valid interval MPC1 will skip all redundant intervals until the AutoScan program is re cycled However the 16 intervals of Program A and Program B cannot be combined into a longer interval sequence larger than 16 For the multi channel units like the MPC1 02 and MPC1 M each of the intervals programmed for Program A and Program B are independent or in other words channel specific To program the AUTOSCAN function Press and hold the blue JSHIFI key then push the JRROGRAM key Rotate the right encoder to select user program A or user program B Press the CENTER key to select a program Next program the waveplates using the front panel controls Use the ENTER key to register the each interval Continue
16. dark blue Using the LOCAL Function Press the LOCALJ key once FiberControl Lightwave Polarization Solutions Decouples the MPC1 channel or channel pair from remote GPIB control and ensures control of the front panel Display now shows waveplate angular position in degrees and resolution setting Each encoder now controls the angular orientation of its corresponding waveplate Immediately stops the last remote command and leaves all waveplates at the last angular position 1 888 91 FIBER toll free 732 332 1860 telephone 732 332 1861 facsimile info fibercontrol com email www fibercontrol com web 68 To Change Angular Resolution Press and release the left hand center and or right encoder knob one or more times The upper row of the display indicates the present resolution of each waveplate in degrees per detent Each press alters the resolution cyclically as 15 1 5 6 0 15 Aio As the knob is rotated the corresponding waveplate rotates at the chosen resolution Using the CENTER Function Press the CENTER key once e Aligns all waveplates simultaneously to the 0 angular position e Alignment to 0 occurs at current scan rate e When completed the display shows the waveplate position as 0 Recalibrating Angular Position of Waveplates Press the CENTER key cycle power via JRPOWERS key then re press CENTER key Assigns all waveplate positions to an assumed 0 angular po
17. encoder provides negative rotation of the waveplate The range of motion of each Lef vre waveplate is limited to 99 gt 99 in increments ranging from 0 15 to 15 With each motion of an encoder the LCD display will report the given position of the waveplate Each waveplate s encoder provides resolution control This resolution is determined by the incremental excursion provided by a given encoder s rotational detent i e the faintly perceptible physical sensation of a snap or tick as the encoder s knob is rotated Angular resolution in degrees detent is changed by gently pressing any given encoder s knob inward towards the instrument By pressing any given encoder pushing in the adjustment knob the resolution of that waveplate is individually and independently changed The top row of the LCD display reports the selected degrees tick setting Resolution settings are toggled between very fine 0 15 per tick fine 1 5 per tick medium 6 0 per tick and coarse 15 per tick Pressing the encoder while the waveplate resolution is on a coarse setting cycles the resolution back to the very fine setting For additional information on altering the waveplates angular resolution see section 4 2 4 When any waveplate is moved manually at the front panel the MPC1 commits the position to memory within 3ms thereby automatically enabling the angular position of all waveplates to be reset on the next power up Th
18. laboratory applications Each significant MPC1 detail will be explained in the following text PADDLE CYCLE_1_SINGLE vi PADDLE _CYCLE_1_MULITI vi This mini application simply moves each Lefevre waveplate in a round robin fashion The significant aspect of this program is the operation of MPC1 ina closed control loop fashion 1 888 91 FIBER toll free F i be rCo ntrol 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 48 Figure 12 A screen shot of Paddle _Cycle_1 MULTI The two demos are essentially the same The only difference between SINGLE and MULTI is the latter contains a small control device a toggle switch used to direct Labview to use either channel 1 A or channel 2 B Structurally PADDLE CYCLE demonstration programs operate as follows via GPIB a waveplate assignment command is issued from LabView to the MPC1 LabView then must wait until MPC1 completes the requested task Using a status byte inquiry LabView waits until the waveplate motion is completed then continues by issuing the subsequent waveplate motion command lf you elect to experiment with this sample program the actions are best illustrated when MPC1 is assigned a very low RATE value e g RATE 1 either via the front control panel or as a GPIB command 1 888 91 FIBER toll free F ibe rG ontrol 732 332 1860 telephone 732 332 1861 facsimile
19. the Poincar Sphere and on the Observable Polarization SONEre cccceccceececeseeceeeeceeeeseesseeesseeeeseeeeaeees 9 Figure 4 The front panel displays of the MPC1 family of products The single channel MPC1 01 Top the two channel MPC1 02 Middle and the four Channel MPC1 M BottOmM ccccceccceeeceeeeeeeeeeseeeeseeeseeeseueeseeseeeeeeeess 11 Figure 5 MPC1 02 front panel showing Lefevre loop waveplate and angular VEIOGILY COMM Ol a E 14 Figure 6 Identification and control features that enable toggling between either of BINS RC Fie PINGS OrMP CO 2s sate a cept cen er peenadecebevet eras eesteeosarade sets eacenee 17 Figure 7 RATE value vs angular velocity of Lefevre waveplates for the MPC1 SSCS sory ecg te E soot eesa asaeaoaansancedancasneecesiesse er 20 Figure 8 Location of the RECALL SAVE and SHIFT keyS ccccseeeeeees 23 Figure 9 Location of the relevant AutoScan KeYS ccseecceseeeeeeeseeeeeeeeeaeeeeees 26 Figure 10 Line voltage and fusing information located on the rear panel of the NS Ot and MO 2 assis eis anectaet sees sensei nih eta daatadeoigaienedgudeiaeadesed gee tae 31 Figure 11 Line voltage and fusing information located on the rear panel of the MPOT pastes aes sre tear canteen ea cence accion ceca tte ease rine eivas E E EE 31 Figure 12 A screen shot of Paddle Cycle 1 MULTL eee eeee eee 48 Figure 13 Annotated string assembly for delivery to the GPIB port in
20. to 35 C Table 4 Physical characteristics of the MPC1 PHYSICAL OverallHxWxD OverallHxWxD Enclosure Dimensions Metric English Height Width MPC1 01 9 2 x 23 5 x 40 cm 3 5 8 x 9 x 15 2U 46 25HP MPC1 02 9 2 x 23 5 x 40 cm 3 5 8 x 9 x 1534 46 25HP MPC1 M desktop 9 2 x 44 8 x 40 cm 3 5 8 x 17 5 x 15 88 12HP MPC1 M rack mount 8 9 x 48 3 x 40 cm 312 x 19 x 15 88 12HP MPC1 18002 r m kit 8 9 x 48 3 x 0 3 cm 3 2 x 19 x 1 8 88 12HP Weight MPC1 01 8 03 Ibs MPC1 02 9 32 Ibs MPC1 M desktop l i 15 92 Ibs MPC1 M rack mount i l 15 88 Ibs MPC1 18002 r m kit 2 1 N 0 22 kg 0 48 lbs Note e Overall heights H of desktop units include the presence of skid resistant rubber pads 0 32 cm 1 8 thick e Overall widths W of rack mount units include mounting hardware e 1U 4 44cm 1 3 4 e HP 0 51 cm 0 2 e MPC1 18002 rack mount faceplate enables the MPC1 01 and MPC1 02 to be rack mounted 1 888 91 FIBER toll free FiberControl es eae Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web Declaration of Conformity Declaration de Conformite Konformitatserklarung FiberControl P O Box 198 Holmdel New Jersey 07733 U S A declares under its own responsibility that the product Motorized Polarization Controller MPC1 conforms to the following product Directives and Standards Safety 73 23 EEC 1973 93 68 EEC 1993 EN 6095
21. 0 1992 Low Voltage Directive including amendments to Directive Standard including amendments 1 2 3 4 and 11 EMC Directive Standard Electromagnetic Compatibility emissions Standard emissions Standard emissions Standard emissions 89 336 EEC EN 50081 1 1992 EN 55022 1998 EN 61000 3 2 1995 EN 61000 3 3 1995 EN 50082 1 1997 Standard Electromagnetic Compatibility immunity EN 61000 4 2 1995 EN 61000 4 3 1995 EN 61000 4 4 1995 EN 61000 4 5 1995 EN 61000 4 6 1995 EN 61000 4 11 1995 Supplementary Information Standard immunity Standard immunity Standard immunity Standard immunity Standard immunity Standard immunity Since this product conforms to the requirements of the Low Voltage Directive 73 23 EEC and the EMC Directive 89 336 EEC the MPC1 carries the CE marking Holmdel New Jersey USA FiberControl Lightwave Polarization Solutions June 28 2002 J D Evankow Jr MTS 1 888 91 FIBER toll free 732 332 1860 telephone 732 332 1861 facsimile info fibercontrol com email www fibercontrol com web 3 General Concepts and Applications 3 1 Introduction This manual describes the operation and specifications of FiberControl s Polarization Controller MPC1 The MPC1 alters the state of polarization SOP of light within single mode optical fibers lt provides a user friendly front panel interface for direct interaction as well as real time
22. 1 FIBER toll free F i be rCo ntro 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web Assistance and Maintenance yi Calibration service and maintenance agreements for the MPC1 series of products are available from FiberControl Assistance for proper product usage is also available Feel free to contact FiberControl via phone fax and or email for assistance FiberControl Lightwave Polarization Solutions 1 888 91 FIBER toll free 732 332 1860 telephone 732 332 1861 facsimile info fibercontrol com email www fibercontrol com web vii Hazard and Warning Labels Symbols The following symbols have been placed at various points on the MPC1 product series To ensure personal safety of users and those around them the user must be familiar with their meaning before operating the unit Assistance is available from FiberControl see Assistance and Maintenance and Warranty and Restrictions These symbols signify posted warnings where extreme caution is required therefore it is not recommended to proceed past them into the enclosure These symbols do not imply that FiberControl recommends the user to proceed inside the enclosure but instead that if the user does choose to proceed it must be with great caution Moreover entry into the enclosure not only incurs the risk of physical harm but also nullifies the MPC1 product series warr
23. 1860 telephone 732 332 1861 facsimile info fibercontrol com email www fibercontrol com web xi Table of Contents 1 Setup and PreparatOn ssuicitnewersscnesiecunaunennuisanusuaeuiaaawueueanuuuuncuuuuneiyaks 1 LI T DECON e E E EE EE EEEE 1 1 2 Rack Mounting the Tabletop UNit ce ccceecccseeeeseeeeseeeeseeeesseeeeeees 2 2 Specifications and General Information cccccssceeesseeeeeeeeeees 4 3 General Concepts and Applications ccccsssceccseseeeeseeeeeseeeeees 8 Sel ANOU UON sc53s cote care E EEEE E E 8 a2 APPICCIU eee EEE E E E EEE E E E E eE 9 4 Front and Rear Panel Description cccceccseeeeeeeeeeeeeeneeeenees 11 n Ie 10 2 EE eee ee ee eee 11 4 2 Front Panel Display and User Interface Manual Operation 12 4 2 1 General Usage Powering up and Powering down c 00008 12 Be OCA eres aeececs eects tae een ook eet eee erent een eee eee 15 4 2 3 Toggling Between Multiple Channels MPC1 02 and MPC1 04 17 4 2 4 Changing Waveplate Angular Resolution ccceeceeseeeeeeeeeeeees 18 4 2 5 Centering Waveplates cccccccccccssscccsseceeseeeesseeeeseeeesseesesseeeeteas 19 4 2 6 Adjusting Rotational Speed RATE cccccseeceseeeeeseeeeeeeeeeeees 20 4 2 Position Memory PreSet ccccccccsscecseecseeeceseceeeeceeeeeeeseeeseeeens 23 d2 o RECN oes E uaa amsdoelinee henson choenquteett 24 429 AutoScan ModE sssrini EEEE EEE 25 4 2
24. 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 37 Programming Note lt is normal convention to PARSE any returned string from the MPC1 after a request is issued either via GPIB or via the serial communications port The reason for this requirement is that often a returned string from a GPIB device such as the MPC1 may contain extraneous characters For instance a returned string may often contain a space character 32 d and or the termination string character 10 d The result of a string compare between a raw unparsed return String and a test string will therefore fail For example If the OPC command is issued via GPIB the MPC1 will return 1 n It is necessary therefore to parse the return string for the desired return code a O or a 1 in this example If your development platform is National Instrument s Labview a convenient string function is included to Search within string for a given sub string In Visual Basic or C it is necessary to write a very simple parser to strip away any extra characters which may be included within the returned string 5 2 1 Waveplate Motion Control of MPC1 Syntax Single Channel X nn nn Y nn nn Z nn nn Syntax Multiple Channel Xc nn nn Yc nn nn Zc nn nn This is the position command of the MPC1 Legitimate values assigned to each channel are in the range of 99 00
25. B4 B3 B2 B1 BO lt LSB gt B 7 Incomplete READ B6 Incomplete WRITE B5 System Error B4 USER INPUT error B3 2 1 0 Not Used by MPC1 always 0 The ESE command is a mask value applied to the Event Standard Register Control to the Status Byte 1 888 91 FIBER toll free F i be rCo ntrol 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 47 ESE lt dec value gt SETS the mast The system default is 255 Oxff hex Unless a specific need is identified it is recommended to NOT change this value ESE Reports the mask setting IDN Queries MPC1 for identification The response will identify the product and the firmware revision RST Performs a cold reset to the MPC1 TST Performs a brief self test and reports general configuration In the event an internal error is detected an error code is presented Else a result code is presented to indicate normal operation and configuration In the event an error code is reported contract FiberControl for assistance 5 4 MPC1 GPIB Remote Programming On the distribution CD you will find a few application files written for the MPC1 in the National Instruments LabView programming environment This section will attempt to explain how and why the techniques used in the application programs were used Further the sub VI components have been written modularly allowing for quick reuse into you own
26. C1 series of products are only to be cleaned with a lightly damp cloth regardless of the precautions and care undertaken by the user doing the cleaning 1 888 91 FIBER toll free F i be rCo ntrol 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web Ground Label Symbol Located on the inside of the MPC1 product series near the switching power supply is the symbol for the Protective Earth shown below This ground symbol is placed next to the green yellow striped ground wire that attaches near the power supply on the side of the enclosure and the ground connection on the power entry module Consistent with CE marking requirements this procedure ensures that all metal portions of the enclosure are properly grounded Protective Earth symbol Despite the grounding design and procedure the MPC1 series of products are only to be cleaned with a lightly damp cloth regardless of the precautions and care undertaken by the user doing the cleaning 1 888 91 FIBER toll free F i be rCo ntro 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web High Level View of this User Guide The FiberControl MPC1 product series User Manual and Programming Guide is organized as follows FiberControl Lightwave Polarization Solutions 1 888 91 FIBER toll free 732 332
27. DDDDDD 1000 0000 0x80 Hex Assembling this into a structure with 1 s framing the value portion Byte 0 1011 1000 Byte 1 1000 0000 Byte 0 0xb8 Byte 1 0x80 5 6 3 Exiting Transparent Mode The following command structure is used lt MSB gt 76543210 76543210 lt LSB gt lt MSB gt AABBICCC DDDDDDDD lt LSB gt AA 11 BB 10 Fi C 1 888 91 FIBER toll free b 732 332 1860 telephone er ontro 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 63 CCCDDDDDDDD Don t care Once again a 1 bit must be placed between AABB and CC DD eg AABB1CCC DDDDDDDD Example to exit Transparent Mode issue the following command 11101000 00000000 Byte 0 Oxe8 Byte 2 0x00 As in standard RS 232 command mode an ACK is sent by MPC1 to the host on completion of any motion command In transparent command mode the programmer may elect to either ignore handshaking or to process the ACK command when each motion has completed 1 888 91 FIBER toll free F i be rCo ntrol 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 64 Appendix A Instructional Program Example AutoScan Code Provided below in tabular form is an example AutoScan program It shows the entry of the corresponding commands at each interval to produce the desired paddle angular orientation Waveplate X Wavep
28. FIBER_ toll free FiberControl E eee Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web xii 5 3 1 Status Byte Register Control Mechanisms cccccsseeeeseeeeeeeees 44 5 3 2 Event Standard Register Control Mechanisms ccsecceees 46 5 4 MPC1 GPIB Remote Programming cccccccsseecseeeeeeeeeceeeceeeeeeeees 47 5 5 MPC1 Serial RS 232 Remote Programming ccccccseceeeeeeeeeeeees 57 5 6 MPC1 Binary Transparent Mode Remote Programming 00 58 5 6 1 Issuing a Motion Command in Transparent Mode 060008 60 5 6 2 Issuing a RATE Change command in Transparent Mode 62 5 6 3 Exiting Transparent MOde ccccccccsseccseeeeeeeeeseeeeseeeeseeeeseeeaaes 62 Appendix A Instructional Program Example AutoScan Code 64 Appendix B LabView Driver Example GPIB and RS 232 Code 65 Appendix C Instructional Program Example Binary Transparent Mode GOde ese ee ee eee 66 Appendix D Front Panel Quick Reference ccccceeesseeeeeeeeeeeeeees 67 1 888 91 FIBER toll free F i be rCo ntro 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web xiii Tables Table 1 Optical SOCCINCAUNOINS suse cet perce cctdceeemeeceessecentarctacttacntoere aaeeeseeencemiandacsaes 4 Fable 2 INSTI Mall ON CON Ol aaan EEEO 5 Table 3 Line power
29. Labview This string concatenation is from the single channel version of MPC1 49 Figure 14 Output String concatenation Notice this command creates the GPIB Command Xc 99 C either A or B to designate the channel AS IV Meets iceis actsanstase sates teense dewaaetgana cuiasdasavasauasuessasasaveeteesasesesaacedaosaeesee 50 Figure 15 Implementation of Conditional GPIB Delay Use this Labview function to confirm MPC1 is ready to accept a new motion command before ISSUING A NEW COMMANA ccccccneccceeeceeeeneeeceeeceueeseeeseeeeeueeaeeesaeeseueeaeeenaees 52 Figure 16 A screen shot of MPC1 Interactive Control ccccceeeeseeeeeeeeeeeees 54 Figure 17 LabView core code for receiving and transmitting to MPC1 Notice the bus arbitration performed via the wait for RQS command item C 55 1 888 91 FIBER toll free F i be rCo ntro 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 1 Setup and Preparation 1 1 Tabletop Unit The MPC1 series was designed primarily as a tabletop unit Four small rubber pads have been placed at the corners on the underside providing anti skid protection and to protect the table s surface While designed with the rubber pads positioned on a table the MPC1 can be oriented in any desired direction i e upside down or on any of its sides with the only caveat being the equi
30. TO1 2 invokes User Program 2 or B on channel 1 AUTO1 S invokes SOP scan program on channel 1 AUTO2 0 STOPS all auto programs on channel 2 AUTO2 1 invokes User Program 1 or A on channel 2 AUTO2 2 invokes User Program 2 or B on channel 2 AUTO2 S invokes SOP scan program on channel 2 It is notable that when any Auto Mode is operating remote axis assignment commands are locked out For example a GPIB axis assignment such as X1 90 will be ignored by the MPC1 during the execution of any AUTO1 assignment Whilst the Auto mode is operating the Rate value may be changed remotely This is done via a remote interface by issuing the RATE or RATEc command for multiple channel model MPC1 s AUTO 0 or AUTOc 0 disables any operating auto scan mode The ability to issue axis position assignments is restored 5 3 IEEE 488 2 Command Status Support MPC1 Support for Standard IEEE 488 2 Commands IDN Identifies the instrument RST Resets MPC1 STB Returns status byte CLS Clears the status byte STR n Sets status byte mask to n SRE Inquires status byte mask from MPC1 ESR Returns status register contents from MPC1 sets the status register mask to n Reports mask setting of status register Reports result from Self Test n 1 888 91 FIBER toll free F i be rCo ntrol 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol
31. USER MANUAL and PROGRAMMING GUIDE FiberControl Motorized Polarization Controller MPC1 01 Single Channel MPC1 02 Dual Channel MPC1 M Quad Channel FiberControl Lightwave Polarization Solutions 1 888 91 FIBER toll free 732 332 1860 telephone 732 332 1861 facsimile info fibercontrol com email www fibercontrol com web Please Note With the understanding and the desire of improving the clarity and readability as well as to reduce omissions and correct errors the information within this manual is subject to change without notice FiberControl shall not be liable for any errors herein or for any accompanying or subsequent damage in connection with the furnishing operation or use of this material With regard to this material FiberControl makes no warrantee regarding the suitability and fitness for any specific function purpose or use Base FiberContro part number MPC1 Printed 12 February 2003 Copyright FiberControl 2003 All rights reserved 1 888 91 FIBER toll free F i be rCo ntro 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web FiberControl s goal is to produce the best valued Lightwave Polarization Solutions to meet a wide range of applications in the field of optical measurements We greatly value input from our customers with ideas to improve and enhance our existing products as well as expand our product
32. XXX CCXX scratch cChannel scratch xxxx XXXX xXxxx CCBB scratch lt lt 1 gt scratch XXXX XXXX XXXC CBBx scratch 0x0001 scratch xxxx XXXX XxXxC CBBI1 scratch lt lt 11 scratch CCBB 1xxx XXXX XXXX uiValue uiValue amp 0x07ff Interested in xxxx x111 1111 1111 11 bit value scratch scratch uiValue scratch CCBB lvvv wyvv vvvv eCommString 0 HIBYTE scratch CommString 0 CCBBlvvv cCommString 1 LOBYTE scratch CommString 1 vvvvvvvl cCommString 2 0x00 Delimit character WriteFile hComm cCommString dwToWrite amp dwWritten amp PortInfo osWrite return TRUE FiberControl Lightwave Polarization Solutions 1 888 91 FIBER toll free 732 332 1860 telephone 732 332 1861 facsimile info fibercontrol com email www fibercontrol com web 67 Appendix D Front Panel Quick Reference To Power up the MPC1 Attach provided power cord by mating C13 plug to the MPC1 s IEC 320 receptacle then insert plug end into line power and push the ROWER key once Integrated green LED will light All waveplates simultaneously align to the last known position Very light tapping sound may be heard during waveplate initialization To Power down the MPC1 Push the JROWER key once The once lighted integrated green LED will dim slowly over a few seconds until dark The display s backlight dims and the alphanumeric information fades until the overall display s becomes
33. Z alters the GPIB address The usable address range is limited to the industry standard range of 1 and 30 It is not necessary to perform the traditional re start of the instrument following a GPIB change Upon exiting the GPIB alteration menu the GPIB address is changed immediately To select the desired address press the CENTER key It is not recommended that address 7 be used for the MPC1 since industry standards choose this for the main computer based controller The GPIB address will be saved into non volatile EEPROM memory To change the GPIB address Press and hold the blue SHIFT key then push the LOCAL key Rotate the right encoder to set desired address and then press the CENTER key Display indicates the address as the right encoder is rotated Address range is 1 to 30 do not choose 7 Programs are saved in non volatile memory Default address MPC1 01 MPC1 02 is 4 MPC1 M is 4 ch 1 2 and 5 ch 3 4 4 3 Rear Panel The rear panel of the MPC1 provides the easy access for connecting line power via the IEC 320 receptacle in the power entry module 1 888 91 FIBER toll free F i be rCo ntro 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 31 Also present is a silk screened table showing the specifications and information on the fusing and line voltage Below in Figure 10 is shown a likeness of the silk scree
34. al measurement equipment integration the ACK may be used to presume the settlement of MPC1 after a motion assignments execution In doing so measurement equipment within the optical circuit may sample on reception of an ACK It is notable that HyperTerminal displays the ACK character as a playing card spade Programming Note When programming the MPC1 via the RS232 port in normal mode handshaking may be handled in one of three direct methods 1 888 91 FIBER toll free F i be rCo ntrol 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 58 a You may monitor the progress of an MPC1 motion assignment by monitoring for the ACK character which MPC1 issues at the conclusion of each move b You may issue an OPC command and parse the return code of either a 0 or a 1 Please remember that if you elect not to use a handshaking method use care when designing a delay mechanism to ensure assignment intervals are not overwritten 3 MPC1 supports a special binary mode which is known to the MPC1 as Transparent Communications Mode This mode is supported by the RS 232 interface only Usage of the Transparent mode to control MPC1 allows for extremely rapid communications for the purpose of leveling the score between RS 232 and GPIB control The transparent mode will be described in greater detail later in this section
35. antee Silk screened onto the back of the MPC1 products is the following Caution High Voltage symbol This symbol shown as a lightning bolt inside an equilateral triangle warns of the presence of life threatening voltages inside of the enclosure if entered by the user Caution High Voltage symbol On the inside of the MPC1 products the locations of these life threatening voltages are not specifically marked Therefore significant and meaningful personal physical risk is present for anyone not completely familiar with the MPC1 series design The level of risk also holds true for the measurement and test equipment of the user 1 888 91 FIBER toll free F i be rCo ntrol 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web vill The Caution symbol shown below as the exclamation point inside a equilateral triangle is also silk screened on the back of the MPC1 product series denoting the requirement of extreme caution if the enclosure is entered into or if the exterior is cleaned with liquids Caution symbol Again assistance is available from FiberControl please refer to Assistance and Maintenance and Warranty and Restrictions To insure the personal physical safety of the operator it is recommended that the top and or bottom covers of the MPC1 product series never be removed at any time The MP
36. ared front panel interface The front panel display of the multiple channel MPC1 i e the MPC1 02 and MPC1 M are engineered to allow rapid identification and control of the controlling channel E FiberControl MPC1 02 POLARIZATION CONTROLLER 15 s 159 5 6 0 5 75 00 44 40 59 55 Controls and indicators used for channel control LOCAL AUTO SCAN ENTER RATE GPIB PROGRAM CH SELECT Figure 6 Identification and control features that enable toggling between either of the channels of MPC1 02 Pressing the SHIFT key together with the RATE key toggles between each of channel A and channel B The LED display positioned above each respective optical connector will allow for rapid identification of the channel under front panel control It is important to note that during the selection process as the optical channels are being toggled all action will briefly pause during the identification of the selected channel The LED indicators flicker during motor motion thus indicating a given channel is operating One further note regarding the LED channel indicators In REMOTE mode both indicators are illuminated And once again as waveplate motion actively occurs the LED for that individual channel will flicker 1 888 91 FIBER toll free F i be rCo ntro 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 4 2 4 Changing Waveplate Angular Re
37. channel will have the same angular velocity 1 888 91 FIBER toll free F i be rCo ntro 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 21 To adjust the RATE of the MPC1 01 Push the RATE key once then rotate the right most encoder to desired rate then press CENTERG Refer to Figure 7 to correlate rate value setting to angular speed Rotating the right most encoder alters the rate of the channel High Low rate values correspond to high Low angular speed Maximum angular rotational soeed of any one waveplate is 2880 sec in Stokes 3 space Lowest angular rotational speed of any one waveplate is 20 sec in Stokes 3 space The multi channel MPC1 series MPC1 02 and MPC1 M allow the simultaneous access on a pair wise basis to the individualized adjustment of the RATE values on a per channel basis For example with the MPC1 02 in the RATE menu the left most encoder alters channel 1 and the right most encoder alters channel 2 Thus regardless of which channel the front panel currently controls when the RATE key is pressed the menu allows the rates of both corresponding channels to be adjusted As mentioned earlier for the MPC1 M the left display corresponds to channels 1 and 2 while the right display is tied to channels 3 and 4 For that reason the previous example given for the MPC1 02 is relevant on a pair wise basis
38. coders Refer to Figure 7 to correlate rate value setting to angular speed Rotating the left most encoder alters the rate of the left channel of that pair Rotating the right most encoder alters the rate of the right channel of that pair High Low rate values correspond to high Low angular speed Maximum angular rotational speed is 2880 sec in Stokes 3 space Lowest angular rotational speed is 20 sec in Stokes 3 space Setting Velocity Setting Velocity Identifier sec Identifier sec 19 1440 9 472 0 8 339 17 16 57 6 213 15 14 13 12 i 90 f 1 n Table 6 A convenient tabular form showing how the RATE setting corresponds to the Stokes angular velocity sec 1 888 91 FIBER toll free F i be rCo ntro 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 23 4 2 7 Position Memory Preset A valuable feature of the MPC1 is the ability to store pre set waveplate positions The MPC1 allows for nine 1 9 preset configurations Any combination of waveplates positions may be quickly saved into non volatile memory by pressing the SHIFT key and the SAVE key simultaneously When saving a particular waveplate configuration desired angular position the MPC1 requests the selection of a preset memory location one of nine Presets can be conveniently recalled as desire
39. d see section 4 2 8 And because these settings are stored in non volatile memory the MPC1 s power may be cycled without losing the waveplates combinatorial positions Using the Waveplate Z encoder select the desired storage location Selection of the preset from a range of location 1 through location 9 is possible by rotating the encoder Pressing the CENTER key saves the current waveplate positions into the preset location E FiberControl MPC1 02 POLARIZATION CONTROLLER C m CAE fil RESOLUTION PROGRAM STATE La Ep a LOCAL AUTO SCAN RATE RECALL GPIB PROGRAM ENTER cysetect CENTER sayg SHIFT EA O CH1 Figure 8 Location of the RECALL SAVE and SHIFT keys 1 888 91 FIBER toll free F i be rCo ntro 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 24 To SAVE a setting in Memory Press and hold the blue SHIFI key then push the JSAVE key Select memory stack location using right encoder Press the CENTER key stores the present angular location of all waveplates Display shows the memory stack setting Select memory stack by rotating encoder Nine 1 9 different memory stack locations are available Presets are saved in non volatile memory 4 2 8 Recalling Returning to a previously saved combination of angular positions is done in a similar operation to that described under Saving see s
40. ection 4 2 7 Pressing the RECALL key invokes the Preset menu To RECALL a Preset from Memory Press the RECALL key Select memory stack location using right most encoder Display shows the memory stack setting Select memory stack by rotating encoder Nine 1 9 different memory stack locations are available Presets are saved in non volatile memory You will be prompted once again to select the preset of choice by rotating the right most encoder and then press the CENTER key to select On selection all 1 888 91 FIBER toll free F i be rCo ntro 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 25 waveplates of the controlled channel will move to the configuration relative angular orientation dictated by the preset 4 2 9 AutoScan Mode 4 2 9 1 AutoScan Overview The MPC1 is equipped with three AutoScan Mode settings at the local interface two programmable AutoScan programs and one fixed AutoScan program The two programmable user defined AutoScan settings provide sequential angular positioning of the paddles and are entered directly at the front panel selecting and saving 16 sets of independent positions of the three paddles for that channel The third non programmable AutoScan sequence acts to provide variable speed scrambling functionality low to medium speed The channels on the MPC1 02 and MPC1 M operate indep
41. endently More specifically the left channel of the MPC1 02 can be chosen to scramble at any desired rate from slow to maximum while the right channel scrambles at its maximum rate 4 2 9 2 AutoScan Mode SOP Scramble SOP scrambling functionality is contained within the AutoScan Mode When Auto scramble is invoked a proprietary firmware algorithm initiates and controls the simultaneous movement of each of the three paddles to enhance the number of unique and independent Stokes vectors within a given period of time The desire is to provide an almost uniform coverage in Stokes 3 space regardless of input SOP The rate of motion in the scramble mode is controlled by the RATE key or by a similar command issued via a remote interface Therefore it is possible to first view and verify the extent of SOP coverage with even early vintage polarimeters by setting the RATE to a slow value the RATE can then be set to higher values to speed the measurement time e g for PDL evaluation 1 888 91 FIBER toll free F i be rCo ntrol 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 26 At the maximum motion rate the repetition period is less than approximately 8 seconds In other words it is possible to provide almost uniform coverage in stokes 3 space in less than 8 seconds for PDL test applications During operation of the Scramble Mode the
42. eption of a command either via GPIB or RS 232 the LCD display will indicate the MPC1 has entered remote control mode with a message i e Remote on the upper line of the display Further on the two channel MPC1 both LED activity indicators will be illuminated MPC1 will identify the active communications interface when remote mote has been invoked Further details of the communications link will be displayed when in remote mode The MPC1 must be in idle mode to initiate a remote request In the event the MPC1 is running an AutoScan program or if the instrument is in a configuration menu commands submitted by the GPIB controller remote host will be ignored lt is recommended that individual commands to the MPC1 be given 50ms by the GPIB controller for processing Hence a series of individual requests or commands to the MPC1 should be spaced at 50ms intervals to allow for command parsing and processing 5 1 1 GPIB Configuration In addition to the front panel interface the MPC1 may be controlled remotely by a GPIB Controller via the GPIB interface or the RS 232 interface via the DB 9 interface The core command structure used to communicate with the MPC1 for both interfaces is similar The GPIB must be configured on the GPIB bus controller The GPIB Bus controller is typically a PC equipped with a GPIB interface card The host must 1 888 91 FIBER toll free F i be rCo ntrol 732 332 1860 telephone 732 332 1861 facs
43. er an error has occurred or whether the MPC1 is listening or talking 1 888 91 FIBER toll free F i be rCo ntrol 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 45 Status Byte Bit Assignments B7 B6 BS B4 B3 B2 B1 BO Table 9 Standard IEEE 488 2 status byte bit assignments In Table 10 additional information is provided explaining the bit assignments B7 Always ZERO RQS bit It is set and cleared internal to the MPC1 The purpose of this bit is to indicate to the controller if data is ready for transmission from the MPC1 to the controller PC This bit is unable to be masked Error Indicator MAV This bit is automatically handled by MPC1 to indicate to the GPIB controller if the output buffer contains characters to transmit B3 B2 BI BO Busy Status 1 Axis in motion 0 Axiside Table 10 Detailed IEEE 488 2 bit assignments As an example reading the status of the busy indicator bit may be done using the following procedure This function incidentally is very similar to reading the response to the query OPC First Set the Status bit mask or the SRQ SRE 1 Explanation The SRE value which is passed in this command represents the bit pattern MSB 0000 0001 LSB decimal 65 for which to mask the status byte A mask to bit on B6 is ignored as is provides request information t
44. espond to high Low angular speed Maximum angular rotational speed is 2880 sec in Stokes 3 space Lowest angular rotational speed is 20 sec in Stokes 3 space 1 888 91 FIBER_ toll free F i be rCo ntro 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 70 To SAVE a setting in Memory Press and hold the blue SHIFT key then push the JSAVE key Select memory stack location using right encoder Press the CENTER key stores the present angular location of all waveplates Display shows the memory stack setting Select memory stack by rotating encoder Nine 1 9 different memory stack locations are available Presets are saved in non volatile memory To RECALL a Preset from Memory Press the RECALL key Select memory stack location using right most encoder Display shows the memory stack setting Select memory stack by rotating encoder Nine 1 9 different memory stack locations are available Presets are saved in non volatile memory To activate the AUTOSCAN function Press the JAUTOSCAN key Select program by rotating the right encoder Press the CENTER fikey to begin playback of the program of choice Immediately sets into motion the previously programmed sequence The sequence repeats continuously lf no Sequence is programmed no motion occurs as the program step number cycles Waveplate rotat
45. ethod for reading a response from the MPC1 MPC1_Read_Fragment simply issues a request to MPC1 and then listens for a response from the instrument The applet begins by sending a request to the MPC1 by the GPIB Controller The command sent is IDN Identify MPC1 responds by identifying itself along with its Firmware revision code 1 888 91 FIBER toll free F i be rCo ntro 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 55 Enclosed is a screen dump of the business end of the applet Sending Receiving Data to MPC 1 via Labview O00 O00 o oo al of0 1 ee 0 g0 g0 o0 0o daoa 4 Assemble outgoing ommand terminating with a in Feed ascii 10 B Transmit command to PIB address 4 Ci wait For an ROS From P t D Assign the GPIB output t oa variable Figure 17 LabView core code for receiving and transmitting to MPC1 Notice the bus arbitration performed via the wait for RQS command item C Notice four distinct items Each will be explained in detail as this mechanism may be mimicked within your own application Item A concatenates the IDN request with the necessary terminator a linefeed ASCII 10 The output of the concatenate function is piped to the GPIB send function 1 888 91 FIBER_ toll free F i be rCo ntro 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solu
46. f Y1 Channel 1 Z1 n 1 888 91 FIBER toll free F i be rCo ntrol 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 36 X2 MPC1 returns angular position of respective axis of Y2 Channel 2 Z2 Paddle Velocity Assignment Inquiry Single Channel MPC1 RATE Assigns speed of motion channel 1 Range 1 20 RATE MPC1 Reports the RATE value for channel 1 Multiple Channel MPC1 RATE1 Assigns speed of motion channel A Range 1 20 RATE1 MPC1 reports the RATE value for channel 1 RATE2 Assigns speed of motion channel A Range 1 20 RATE2 MPC1 reports the RATE value for channel 2 Auto Mode Invocation single Channel MPC1 AUTO 0 Remotely disable all auto modes AUTO 1 Remotely invoke User Program A mode AUTO 2 Remotely invoke User Program B mode AUTO S Remotely invoke scramble mode Multiple Channel MPC1 AUTO1 0 Remotely disable all auto modes channel 1 AUTO2 0 Remotely disable all auto modes channel 2 AUTO1 1 Remotely invoke User Program A mode channel 1 AUTO2 1 Remotely invoke User Program A mode channel 2 AUTO1 2 Remotely invoke User Program B mode channel 1 AUTO2 2 Remotely invoke User Program B mode channel 2 AUTO1 S Remotely invoke scramble mode channel 1 AUTO2 S Remotely invoke scramble mode channel 2 1 888 91 FIBER toll free F i be rCo ntrol 732 332 1860 telephone
47. f these parts 217 l Q 656 Gg 1 312 10 32 2b TAP THRU TYP 2 PLACES Figure 1 One of the two tapped front enclosure housing bezels part MPC1 18001 F i b C 1 888 91 FIBER_ toll free 732 332 1860 telephone er ontro 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web The first is the tapped front housing bezel Figure 1 in place of the existing untapped bezels Since it requires the removal of the top and bottom covers installing these is done at the factory The standard desktop version of the MPC1 s front housing bezels does not have the pair of tapped mounting holes 10 32 displayed in Figure 1 The mounting frame shown below in Figure 2 is 1 8 thick 3 wide and 19 long With the tapped front enclosure housing bezels replacing the stock bench top bezels the front panel of the MPC1 mounts through the center of the opening and secured with two pair 4 10 32 flat head Phillips stainless steel machine SCrews Figure 2 Rack mount mounting frame part MPC1 18002 If desired the four channel MPC1 04 can be supplied with rack mounting capability MPC1 04 PC R option With this option the chassis of the unit contains mounting flanges that are immediately compatible to the standard 19 equipment rack rails 1 888 91 FIBER toll free F i be rCo ntr
48. first complete the current motion assignment before beginning on the next command For instance if the following command list is processed lt Y Axis begins at 0 gt Y 1 99 Y 1 99 MPC1 will process the two rapid succession commands in the following method Y will move to position 99 then immediately begin on the next motion back toward 99 In other words MPC1 will not abandon the current motion assignment for a successive move assignment An important distinction must be made the MPC1 buffers a single command for each axis Using again the example recently discussed 1 888 91 FIBER toll free F i be rCo ntrol 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 39 Y1 99 Y1 99 Y1 32 5 lf the axis is processing the Y1 99 command and TWO successive assignments are submitted MPC1 will honor only the last most motion assignment This implies again using the above example that Y1 99 will be OVERWRITTEN by the Y1 32 5 assignment For rapid fire motion assignments it may be wise to make an inquiry from MPC1 to check on the motion status This may be done via three methods issue a channel inquiry X7 Y1 217 issue an OPC command or issue and read the status byte register from the MPC1 via a serial poll Both of these commands will be described in further detail below 5 2 2 Inquiry of Axis Position Syntax Single Cha
49. imile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 33 have a GPIB interface properly installed and interconnects must be made between the MPC1 and the GPIB controller system The GPIB Address of MPC1 is configured using a soft switch The traditional DIP switch is not necessary for this instrument To configure the address of MPC1 simply press the SHIFT and the LOCAL keys together on the front panel of MPC1 A menu will appear Using the right most encoder change the MPC1 GPIB address to an address which is free on the system you are using To assign the new GPIB address simply press the CENTER key This new address will be saved to non volatile memory for future use For the MPC1 01 and MPC1 02 the factory default GPIB address is 4 In the case of the MPC1 M the default GPIB address settings are 4 on channel 1 channel 2 and 5 on channel 3 channel 4 For the MPC1 M two unique GPIB addresses are required The first left hand side display s GPIB address corresponds to Channel 1 and Channel 2 the right hand side display s GPIB Address to Channel 3 and Channel 4 It is important to set each of these GPIB addresses to different values lt is also important to note the terminating character or EOL character of your GPIB host system MPC1 requires each command to be terminated with a Linefeed otherwise known as the LF ASCII Ox0A character It is necessary to configure the ho
50. inction between the transparent mode and the standard command mode is the transparent mode motion commands are issued in STEPS not degrees To elaborate on the step assignment value MPC1 employs a micro stepping scheme to provide a total of 2400 steps per full motor revolution The active range of the MPC1 paddles is 198 99 gt 99 As the step resolution is 0 15 per step provides a product of 1320 total steps within the assignable range The origin of each Lefevre waveplate is as follows step 0 99 The maximum position or 99 is step position 1320 Hence every value sent in transparent mode must make the degree to step conversion This is stated as Step Position Step angle in degrees 999 0 15 per step To calculate step position 22 5 the result formula is 22 5 99 0 15 step 202 5 approx 810 steps 1 888 91 FIBER toll free F i be rCo ntrol 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 61 810 steps 0x032A hex 0000 0011 0010 1010 16 bit binary This truncates to an 11 bit value of binary 011 0010 1010 Taking for instance the assignment of axis X to position 22 5 Encapsulating this value into a transparent command AA 00 the move command BB Channel 00 for axis X CCCDDDDDDDD 011 0010 1010 absolute position value A mandatory 1 bit in bit p
51. ional speed is dictated by the current rate setting Programs are saved in non volatile memory Cannot be controlled programmed remotely 1 888 91 FIBER_ toll free F i be rCo ntro 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 71 To program the AUTOSCAN function Press and hold the blue JSHIFI key then push the JRROGRAM key Rotate the right encoder to select user program A or user program B Press the CENTER key to select a program Next program the waveplates using the front panel controls Use the JENTER key to register the each interval Continue to register intervals as desired Programmed sequences repeat continuously therefore only unique waveplate positions need be set as intervals lf no Sequence is programmed no motion occurs Each Program has a maximum of 16 intervals but cannot be combined into longer interval sequences For longer sequences with more independent positions remote control can be used Waveplate rotational speed is dictated by the current rate setting Cannot be controlled programmed remotely Programs are saved in non volatile memory To change the GPIB address Press and hold the blue JSHIFT key then push the LOCAL key Rotate the right encoder to set desired address and then press the CENTER key Display indicates the address as the right encoder is rotated Address range is
52. is short interval 1 888 91 FIBER toll free F i be rCo ntro 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 15 provides adequate time for the user s angular settings to be saved in all but the most severe power failure conditions It is important to note that this memory functionality does not exist however when motion commands are invoked via remote control user entered pre set programs or the scramble mode The resolution is also not saved in memory on power up it will be set to the default 0 15 per tick Powering down an energized MPC1 is a simple matter of pushing the power key once All LEDs on the MPC1 specifically those at the upper right hand side of the front panel i e MPC1 02 and MPC1 M and the one integrated into the power switch will dim slowly over the course of a few seconds The backlights on the display MPC1 01 or displays MPC1 02 and MPC1 M will dim as the alphanumeric information fades to a dark blue If so desired the power cord can now be removed from the back panel s IEC 320 receptacle To Power down the MPC1 Push the JROWER key once e The once lighted integrated green LED will dim slowly over a few seconds until dark The display s backlight dims and the alphanumeric information fades until the overall display s becomes dark blue 4 2 2 Local The LOCAL key located at the left most position in
53. late Y Waveplate Z ooo i S e O 2e l O In the above example the MPC1 will execute Interval 1 2 3 and 4 sequentially Because Intervals 5 through 16 are not assigned the program skips those intervals and rapidly re cycle the program back to Interval 1 1 888 91 FIBER toll free F i be rCo ntrol 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 65 Appendix B LabView Driver Example GPIB and RS 232 Code Please refer to Distribution CD FiberControl Lightwave Polarization Solutions 1 888 91 FIBER toll free 732 332 1860 telephone 732 332 1861 facsimile info fibercontrol com email www fibercontrol com web 66 Appendix C Instructional Program Example Binary Transparent Mode Code Finally to illustrate a packing scheme as follows is a Win32 code fragment to perform such transparent mode serial encapsulation This C function is passed a channel and a command The function will output via the WriteFile command the packed command to the RS 232 interface BOOL TransmitCommand char cCommand char cChannel unsigned int uiValue DWORD dwWritten DWORD dwToWwrite 3 unsigned char cCommString 4 static int tempy unsigned short int scratch 16 bit variable scratch 0x0000 init scratch Play safe scratch cCommand scratch xxxx XXXX XXXX XxCC scratch lt lt 2 scratch xxxx XXXX X
54. line Please feel free to offer your ideas and or criticisms We look forward to hearing from you and in meeting your needs in the field of polarization The Staff of FiberControl 1 888 91 FIBER toll free F i be rCo ntro 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web Warranty and Restrictions FiberControl FC warrants material and production of the MPC1 series for a period of 12 months from the shipping date During this warranty period FC will see to defaults arising from manufacturing via direct repair or replacement at FC s discretion For warranty repairs or service the unit must be sent back to FC U S A or to a place determined by FC The customer will be responsible for shipping costs to FC and in case of warranty repairs FC will cover the shipping costs back to the customer If no warranty repair is applicable the customer will be responsible to return shipping expenses In case of shipment from outside the United States all duties taxes etc arising from the transfer will be the responsibility of the customer FC warrants the hard firm and software designed by FC for this unit to operate fault free if they are handled according to our requirements However FC does not warrant a fault free and uninterrupted operation of the unit of the soft firm or hardware for any specific or special application s nor this instruc
55. move assignment This technique is exemplified in the sample program Conditional GPIB_Delay vi 1 888 91 FIBER toll free F i be rCo ntrol 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 42 5 2 5 Inquiry of Assigned Rate Single Channel Syntax RATE Multiple Channel Syntax RATE1 or RATE2 MPC1 will return the value assigned to the axis motion velocity constant The default is maximum speed It is notable that he RATE value is not stored in non volatile memory when assigned via GPIB or RS 232 as it is through a front panel assignment 5 2 6 Remote Invocation of Auto Mode and Scramble Mode Single Channel Syntax AUTO n Multiple Channel Syntax AUTO1 n AUTO2 n When issued to a single channel MPC1 the AUTO command initiates or halts a pre stored user program As with prior MPC1 commands the c component of the command indicates the channel Single Channel AUTO 0 STOPS all auto programs AUTO 1 invokes User Program 1 or A AUTO z2 invokes User Program 2 or B AUTO S invokes SOP scan program Multiple Channel F 2 b C 1 888 91 FIBER toll free 732 332 1860 telephone j O n t ro 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 43 AUTO1 0 STOPS all auto programs on channel 1 AUTO1 1 invokes User Program 1 or A on channel 1 AU
56. mple AutoScan program with a detailed explanation 4 2 9 6 Recalling an AutoScan Program Recalling a previously saved user AutoScan program is initiated by pressing the AUTOSCAN key A menu is presented which allows three options Display of available programs exit of the menu and selection of a program Use the right most encoder to scroll through the program options Press the Center key to select play back the program Press the AutoScan key to exit without executing a program On selection of a user program execution begins During each step in the program the AutoScan execution status program and interval is reported on the LCD display Each waveplate configuration is attained in rapid succession It is also notable that the speed in which the AutoScan program is executed is governed by the speed configuration provided by the RATE menu Hence it is possible to execute the user defined AutoScan sequence in a variety of execution speeds To do this simply alter the execution rate via the RATE key This is done outside of the AutoScan execution mode however 1 888 91 FIBER toll free F i be rCo ntrol 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 30 4 2 10 Utilities Changing the GPIB address can be done by first pressing the SHIFT key and then the LOCAL key This invokes the GPIB address menu In this menu the encoder for waveplate
57. ncatenation Notice this command creates the GPIB Command Xc 99 C either A or B to designate the channel assignment LabView requests a status byte via a Serial Poll The status byte is returned and masked with a 1 0x01 Keep in mind the least significant bit of the status byte contains a busy flag Masking the serial byte with a 0x01 yields a result containing only the busy bit If the status byte busy bit equals 1 the MPC1 is unavailable for a new instruction Hence LabView waits After a short delay the status byte is requested again via a serial poll Only when the busy bit cleared CONDITIONAL GPIB DELAY ends allowing LabView to issue a new command to MPC1 Alternatively the OPC command may be issued to MPC1 LabView reads the command response from MPC1 The returned value is then compared to a 1 ASCII 48 or a to a 0 ASCII 49 Please recall a 1 indicates the MPC1 completed a command and a 0 reports the MPC1 is busy 1 888 91 FIBER toll free F i be rCo ntrol 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 51 lf MPC1 is busy the sub vi will re cycle by waiting 50 100ms then re test via a subsequent OPC query If the MPC1 reports the command is completed a 1 it is now safe to issue another move request to the MPC1 Please note it is a wise approach to parse the return string f
58. ned label appearing on the back of the MPC1 01 and MPC1 02 units MODEL NUMBER MPC1 SD LINE VOLTAGE 47 63 Hz 85 264 VAC Figure 10 Line voltage and fusing information located on the rear panel of the MPC1 01 and MPC1 02 Figure 11 shows a likeness of the silk screened label appearing on the MPC1 M MODEL NUMBER MPC1 M LINE VOLTAGE 47 63 Hz 85 264 VAC Figure 11 Line voltage and fusing information located on the rear panel of the MPC1 M The line fuse is housed in upper part of the power entry module The fuse location is accessed by gently pulling out the fuse holder A slow blow 1 x 1 14 is placed under the plastic retaining strip of the fuse holder Remote control for the MPC1 is made available via industry standard bulkhead connectors The EIA RS232 is available via the standard female DB 9 connector and IEEE 488 via the GPIB connector The rear panel also contains the warning labels see Hazard and Warning Labels Symbols for additional information A fan with integrated fan guard and serial number is also located on the rear panel 1 888 91 FIBER toll free F i be rCo ntrol 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 32 5 Remote Operation The MPC1 Command Set 5 1 General Initiation of all communications is performed via a remote request by a host computer to the MPC1 On rec
59. ng and is accompanied by a rapid slightly audible tapping sound Immediately following the user system is available for use After initialization MPC1 will recall and position all waveplates to their last assigned positions Hence the instrument will recall its own settings from the last time the system was used Even if the MPC1 is unplugged for a prolonged duration the last known position will be recalled as this position information is held in non volatile memory Individually and independently rotatable front panel encoders control the angles of each of three Lefevre waveplates These are shown in Figure 5 above the row of push buttons For ease of reference within this Manual each of the three encoders refers to the internal waveplates as left or left hand center and right or right hand left to right respectively 1 888 91 FIBER toll free F i be rCo ntro 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web gt FiberControl MPC1 02 POLARIZATION CONTROLLER E O O O OUTPUT POWER 15 O O O PROGRAM O Ree E mt AUTO SCAN RA E GPIB PROGRAM ENTER cHseLecr CENTER gaye SHIFT S Figure 5 MPC1 02 front panel showing Lef vre loop waveplate and angular velocity controls Clockwise motion of the encoder provides positive rotation of the corresponding Lef vre waveplate Likewise counter clockwise rotation of the
60. nnel X Y Z Syntax Multiple Channel Xc Yc ZC This command when issued will return the value of each of these axis positions in degrees To issue an axis position inquiry on a single channel MPC1 a two character command may be submitted The axis position in degrees is reported for Axis X upon the issuance of the command X Likewise the second and third axis is returned via commands Y and Z respectively 1 888 91 FIBER toll free F i be rCo ntrol 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 40 On a multiple channel MPC1 the second character of the position assignment is the channel designator Hence X17 corresponds to a position request for the first axis of channel 1 Likewise X2 corresponds to a position request for the first axis of channel 2 Again to maintain compatibility to the MPC1 single channel the omission of a channel on a multi channel MPC1 indicator sets the inquiry to the default of channel A The response from MPC1 will be as follows S For example Command Sent X or X1 Response from MPC1 60 00 Command Sent Y or Y1 Response from MPC1 60 00 Command Sent Z or Z1 Response from MPC1 2 40 lf the axis is operating at a very slow rate it is possible an axis inquiry will provide a response based on the progress of the axis motion
61. o the GPIB host Bit BO is the Busy Status bit It is set high 1 when the MPC1 is busy and it is set low 0 when it the MPC1 is idle 1 888 91 FIBER toll free F i be rCo ntrol 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 46 Following the SRE 1 assignment subsequent STB inquiries will either provide a response of the following states all values in HEX O dec 0x00 hex 0000 0000 binary MPC1 is in READ mode B6 0 and NOT Busy BO 0 1 dec Ox01 hex 0000 0001 binary MPC1 is in READ mode B6 0 and Busy B0 1 64 dec 0x40 hex 0100 0000 binary MPC1 is in WRITE mode B6 0 and NOT Busy BO 0 65 dec 0x41 hex 0100 0001 binary MPC1 is in WRITE mode B6 0 and Busy BO 1 In the application program executing on the GPIB Controller only bit BO of the Status byte is of interest It is hence possible to mask the Serial Poll response with hex 0x01 and perform a Boolean test for only BO Based on the test of bit BO the application program can test whether MPC1 has completed a command request SRE Reports the SRE Mask The default mask is 255 dec Oxff After an assignment to SAE the mask value may be confirmed by an SRE Request 5 3 2 Event Standard Register Control Mechanisms ESR Reports the Event Status Register As follows are the bit assignments of this register lt MSB gt B7 B6 B5
62. ol 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 2 Specifications and General Information Table 1 Optical specifications Optical Specifications or 980 nm region Return Loss Connector polish gt 50 dB 09 gt 60 dB 8 fusion splice Maximum Rotational Speed Cascaded Channels MPC1 01 3 waveplates 8 640 sec MPC1 02 6 waveplates 17 280 sec MPC1 M 12 waveplates 34 560 sec Number of Save Recall Settings Z O Z o Z T 9 O i 1550 nm with connectors i 1550 nm completely polarized light 1550 nm FC PC connectors i Below SRS limit SBS limit determined by the spectral broadening of user s source Mechanical rotations via micro stepped stepper motors Statistically calculated mechanical value from experimental measurements of a representative sample of early production units non guaranteed non warranted specification Below mechanically resolved experimental measurement limit of 0 0069 lt 0 5 Corresponding to transitions in Stokes 3 space 1 888 91 FIBER toll free F i be rCo ntrol 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web Table 2 Instrumentation control NSTRUMENTATION CONTROL Parallel Control Interface GPIB IEEE 488 2 MPC1 01 1 port MPC1 02 1 port MPC1 M 1 port Serial Control Interfaces EIA RS232 amp Bina
63. or a return value Depending on the GPIB implementation on the host other characters may be received with the return string LabView conveniently provides the Match TRUE FALSE String function to perform this functionality Subsequent motion steps employ a similar structure A motion request is issued by the GPIB Controller LabView running on a PC and the MPC1 is polled to indicate the task is completed Given the ability to use either method the serial poll method is far superior to the OPC method The reason is as follows issuing a Serial Poll and reading the Status byte is very rapid The GPIB bus is not cluttered by the traffic required to transmit the OPC command and response The performance of your application will benefit as a result Further the serial poll method is easier to implement in LabView In a larger application it is recommended the time used to wait for MPC1 to complete a command be used to do another task It is unnecessary to wait ina tight loop for the MPC1 to complete its motion assignment For instance during the time MPC1 is moving a waveplate it would be a good interval to take measurements make calculations etc Programming Note The use of sub vi CONDITIONAL_GPIB_DELAY vi is recommended in Labview applications to form efficient GPIB handshaking between the host and the MPC7 1 888 91 FIBER toll free F i be rCo ntro 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polari
64. osition 3 of the most significant byte is used to frame the command To clarify this point the full 16 bit command is AABB1CCC DDDDDDDD Byte 0 00001011 Byte 1 0010 1010 Byte 0 Ox0OB Byte 1 Ox2A As a second Example to issue a command to the Z axis for an angle of 45 45 degrees 99 degrees 0 15 deg step 360 steps As a 16 bit binary value 90 steps is represented as 0000 0001 0110 1000 As we are interested only in an 11 bit value truncation is necessary Our original value of 360 value is hence reduced to 001 0110 1000 AA 00 the move command BB 10 Paddle Z axis 2 binary 10 CCCDDDDDDDD 001 0110 1000 absolute position value Framing the CCCDDDDDDDD with the leading 1 and combining Byte 0 0010 1001 Byte 1 0110 1000 Byte 0 0x29 Byte 1 0x68 1 888 91 FIBER toll free F i be rCo ntrol 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 62 5 6 2 Issuing a RATE Change command in Transparent Mode The following command structure is used lt MSB gt 76943210 760543210 lt LSB gt lt MSB gt AABBICCC DDDDDDDD lt LSB gt AA 10 BB 11 CCCDDDDDDD LOWER 8 bits represent the speed constant lt MOB gt 70540210 7eo45Z2L0 sLSB gt lt MSB gt 10111XXX DDDDDDDD lt LSB gt Valid values for value for RATE is 0 gt 254 As an example to set the rate to 128 AA 10 BB 11 CCC Don t Care X DD
65. out interfering with the operation on channels 3 and 4 The converse is true for the right display So it is possible to have channels 1 through 4 operating remotely and then decide to control locally channel 4 via the front panel by pressing the right display s LOCAL key and adjusting channel 4 as desired without ever altering the movement of any of the waveplates of channels 1 and 2 Using the LOCAL Function Press the LOCALJ key once Decouples the MPC1 channel or channel pair from remote GPIB control and ensures control of the front panel Display now shows waveplate angular position in degrees and resolution setting Each encoder now controls the angular orientation of its corresponding waveplate Immediately stops the last remote command and leaves all waveplates at the last angular position Please note the MPC1 is invoked into remote control mode via commands received by either the MPC1 s RS 232 or GPIB ports If a controlling computer dispatches a stray command the MPC1 will progress to remote mode In doing so the front panel s direct interactive control capability will be disabled 1 888 91 FIBER toll free F i be rCo ntro 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 17 4 2 3 Toggling Between Multiple Channels MPC1 02 and MPC1 04 Multi channel MPC1 instruments control two independent waveplate sets via a sh
66. pment s secure placement to ensure the safety of the end user as well as others Plug appropriate end of the provided power cord into the MPC1 s IEC 320 receptacle and the other end into a properly grounded electrical outlet Press the power switch in the lower left hand corner of the front panel to turn the unit on see section 4 2 1 for more details on powering up and powering down the unit With the unit secured in place the optical fibers can be attached Be sure to follow proper cleaning procedure for the connectors prior to inserting them into the bulkhead feedthrough e g using compressed air to remove particles 1 888 91 FIBER toll free F i be rCo ntrol 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 1 2 Rack Mounting the Tabletop Unit While the MPC1 family of polarization controllers has been designed primarily as desktop units they can also be rack mounted This section discusses the various mounting brackets available For the MPC1 single channel and double channel units MPC1 01 and MPC1 02 the following hardware options apply e Part MPC1 18001 Tapped front enclosure housing bezels one pair factory installed e Part MPC1 18002 Rack mount mounting frame 19 x 3 1 2 x 1 8 e Part MPC1 180003 Rack mount screws 10 32 flat head two pair Below are two figures Figure 1 and Figure 2 showing two o
67. progress of the scramble cycle period is indicated on the front panel LCD display from 0 to 100 Scramble mode is exited at any time during operation by pressing the AutoScan key 4 2 9 3 AutoScan Mode User Defined Because of the enhanced AutoScan like capability offered in the remote control feature set e g speed and flexibility AutoScan is a front panel feature only not programmable or controllable remotely i e GPIB RS 232 or BTM One advantage provided by this independent isolated set of interfaces is that it insures that the front panel memory pre sets are not inadvertently overwritten Please refer to section 5 for additional information on programming the enhanced AutoScan like feature gt FiberControl MPC1 02 POLARIZATION CONTROLLER o eee RESOLUTION t PROGRAM STATE rg POWER i 0 15 oas CH2 LOCAL AUTO SCAN RATE RECALL GPIB cHsecect CENTER cave CH 1 Figure 9 Location of the relevant AutoScan keys Using this feature a routine may be choreographed as desired to invoke a series of steps in a rapid succession On reaching the final step of the program the routine is automatically repeated 1 888 91 FIBER toll free F i be rCo ntro 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 2 To activate the AUTOSCAN function Press the JAUTOSCAN key Select program by
68. r These summaries are grouped together in Appendix D 4 2 Front Panel Display and User Interface Manual Operation 4 2 1 General Usage Powering up and Powering down To power up the MPC1 press the large dark colored button in the lower left front panel marked POWER An integrated green LED will light indicating the unit is powered A pictorial diagram is also shown designating the operation of the powering i e depressed button corresponding to powered on 1 and the out button position corresponding to unpowered 0 lf the LED does not light verify that the power cord is connected and or that the line voltage is within the proper range see MPC1 input power specifications in section 2 1 888 91 FIBER toll free F i be rCo ntrol 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web To Power up the MPC1 Attach provided power cord by mating C13 plug to the MPC1 s IEC 320 receptacle then insert plug end into line power and push the JROWER key once Integrated green LED will light All waveplates simultaneously align to the last known position Very light tapping sound may be heard during waveplate initialization The MPC1 on power up runs through a self test initialization process automatically moving all waveplates to a preliminary position This operation completes within seconds depending on the rate setti
69. r optic research develooment and manufacturing controlling these variations in SOP is critical Orientation Psi 79 4 Alpha 56 0 Delta 80 9 a Start 8 FiberControl Researc Sphere 1 Poincare C amp Sphere 2 Observabl 7 Figure 3 An example showing the rotation of a single fractional waveplate displayed as a polarimetric plot on the Poincar Sphere and on the Observable Polarization Sphere In Figure 3 the displayed image shows two representations of the Stokes parameters plotted in 3 space i e Poincar Sphere and the Observable Polarization Sphere With 1 888 91 FIBER toll free F i be rCo ntro 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 10 both spheres the portion of the curve in red corresponds to front surface of the sphere blue the back surface Changes in the physical orientation of the MPC1s paddles move the output SOP Figure 3 shows an example of the movement in Stokes Space resulting from the rotational movement of one paddle In this particular example the SOP at the input of the rotated paddle waveplate is close to linear resulting in a nearly balanced set of lobes crossing in the center i e close to the characteristic figure eight curve Any arbitrary output SOP i e any portion of Stokes Space can be achieved by moving all three paddles Many applications exist for the
70. roke from the host is echoed back to the host This allows for remote use by a terminal program such as HyperTerminal Further a monitor program is written into the Serial handler to allow for an interactive dialog between a host and the MPC1 The pin assignments for the RS 232 are listed in the following table Transmit Data Signal Ground Table 8 RS 232 pin assignments for MPC1 For the MPC1 M two RS232 ports exit the back panel Each channel may be addressed as separate devices 1 888 91 FIBER toll free F i be rCo ntrol 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 35 5 2 Command Structure of MPC1 All GPIB Commands must be in ALL CAPS MPC1 Specific Commands Synopsis Paddle Motion single Channel MPC1 X H Move waveplate to position nn nn degrees Y HH Z HH CEN Center all waveplates Multiple Channel MPC1 X1 4 Move waveplate channel 1 to position nn nn degrees Y1 4 Range 99 00 gt 99 00 21 H X2 Move waveplate channel 2 to position nn nn degrees Y2 Range 99 00 gt 99 00 Z2 H HH CEN1 Center all waveplates on Channel 1 CEN2 Center all waveplates on Channel 2 Paddle Position Inquiry single Channel MPC1 X MPC1 returns angular position of respective axis Y Z Multiple Channel MPC1 X1 MPC1 returns angular position of respective axis o
71. rotating the right encoder Press the CENTER fikey to begin playback of the program of choice Immediately sets into motion the previously programmed sequence The sequence repeats continuously lf no Sequence is programmed no motion occurs as the program step number cycles Waveplate rotational speed is dictated by the current rate setting Programs are saved in non volatile memory Cannot be controlled programmed remotely 4 2 9 4 Programming and AutoScan Program To begin programming press the SHIFT key together with the PROGRAM Key The LCD display will indicate AutoScan Program on the top line The bottom line presents a selection menu of different programs available Rolling the right encoder clockwise counterclockwise changes the selection When the program of choice is presented on the lower line press the CENTER key to select To abort the programming operation press the AUTOSCAN key a second time On selection of a user program for alteration programming of the AutoScan is done via a Teach mode The normal manual waveplate controls are now fully functional Any waveplate configuration may be selected using the waveplate encoders and the CENTER key When a desired waveplate position is chosen the interval and the respective waveplate position for the interval may be saved via the ENTER key The next interval is now available for programming Throughout the programming process the LCD display indicates the
72. ry Transparent Mode MPC1 01 1 port MPC1 02 1 port MPC1 M 2 ports Response Time w GUI interface capable development environment System Controller GPIB Controller Processor Win2000 Pro Windows XP Front Panel Control Interface Display s MPC1 01 1 MPC1 02 1 toggled between channels MPC1 M 2 toggled between channel pairs Waveplate Rotation Three independent encoders cw ccw SOP Scramble One button actuation start stop SOP AutoScan pseudo random User algorithms entered at front panel or via GUI Rotational Step Rate Adjusted with one button and corresponding encoder Rotational Step Size Adjusted by depressing encoder s Centering Waveplates One button actuation Channel Select Two button actuation GPIB Adjusted with one button and encoder Local One button actuation w GPIB IEEE 488 2 EIA RS 232 and Binary Transparent Mode ts MPC1 01 MPC1 02 per optical channel MPC1 M per optical channel for each of two independent interfaces 1 888 91 FIBER toll free F i be rCo ntro 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web Table 3 Line power and temperature LINE POWER TEMPERATURE 47 63 Hz Power Dissipation nominal MPC1 01 11 0 W MPC1 02 19 9 W MPC1 M 41 5 W Fusing Requirements MPC1 01 1 Amp MPC1 02 1 Amp MPC1 M 1 Amp Power Receptacle IEC 320 Power Supply Efficiency nominal 82 Operating Temperature 10 C
73. s alters the resolution cyclically as 15 1 5 6 0 15 I5 S As the knob is rotated the corresponding waveplate rotates at the chosen resolution 1 888 91 FIBER toll free F i be rCo ntro 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 4 2 5 Centering Waveplates Another useful feature of the MPC1 is the CENTER key This key brings all waveplates in the chosen optical channel to the 0 angular position This has shown to be a convenient tool to bring all waveplates to the home position but does not recalibrate the waveplate s relative angular position Using the CENTER Function Press the ICENTER key once e Aligns all waveplates simultaneously to the 0 angular position e Alignment to 0 occurs at current scan rate e When completed the display shows the waveplate position as 0 On the MPC1 02 and MPC1 M the pressing of the CENTER key will home position only the waveplates of the selected channel Under normal operation recalibration should not be required but if desired recalibration can be done by first hitting the CENTER key and then cycling the main power during which the initial tapping sound will occur just prior to the waveplates being moved to the 0 angular position Recalibrating Angular Position of Waveplates Press the ICENTER key cycle power via JPOWER key then re press CENTER key
74. s delayed until ALL axes have arrived to their final position step 3 All waveplates are again given a new assignment All waveplates move again This second example provides more efficient movement to a new SOP by ganging many axes together to perform three discreet motion commands as a single movement VISA_CONDITIONAL vi VISA PADDLE CONTROL 1 vi This is a simple variation of aforementioned example Labview applications which employ a Labview VISA interface rather than the direct GPIB access approach This is a reference example of addressing MPC1 using the VISA method if this is your programming preference MPC1_INTERACTIVE CONTROL vi This example program illustrates a method of user input to control the MPC1 remotely The example provides a simple user interface with a conveyance layer to format LabView control output into a MPC1 angle assignment command then transfer the request to the MPC1 The interactive example application employs the same hold until complete sub vi as used in prior examples 1 888 91 FIBER toll free F i be rCo ntrol 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web E MPC 2 Interactive 2400 13 Feb 03 vi Figure 16 A screen shot of MPC1 Interactive control Either of these methods may be employed as your application dictates MPC1_ READ FRAGMENT vi The final example applet describes a desirable m
75. sition Then moves all waveplates to initialization position tapping sound Alignment to 0 occurs at current scan rate When completed the display shows the waveplate position as 0 1 888 91 FIBER_ toll free F i be rCo ntro 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 69 To adjust the RATE of the MPC1 01 Push the RATE key once then rotate the right most encoder to desired rate then press CENTERG Refer to Figure 7 to correlate rate value setting to angular speed Rotating the right most encoder alters the rate of the channel High Low rate values correspond to high Low angular speed Maximum angular rotational soeed of any one waveplate is 2880 sec in Stokes 3 space Lowest angular rotational speed of any one waveplate is 20 sec in Stokes 3 space To adjust the RATE of the MPC1 02 and MPC1 M Under the display corresponding to the desired channel pair push the RATE key once then rotate either the left most or right most encoder to desired rate then press JCENTER Rotational rates for that channel pair are listed above the outer encoders Refer to Figure 7 to correlate rate value setting to angular speed Rotating the left most encoder alters the rate of the left channel of that pair Rotating the right most encoder alters the rate of the right channel of that pair High Low rate values corr
76. solution The MPC1 encoders used to control the angular position of each of the waveplates were engineered and designed by the manufacturer to have an intrinsic detent In other words with rotary movement the knob feels like it is physically stopped in discrete steps This allows the user to position any of the three waveplates precisely Pushing and releasing the encoder of the desired channel controls the waveplate step size or angular resolution from one detent to another This feature provides the end user with the ability to move the angular position of any of the waveplates quickly from one end point to the other or in precise 0 15 detent steps Each channel s resolution is independently controllable meaning that the left hand waveplate could be set to 0 15 per detent while the center waveplate is 15 per detent and right waveplate is 6 per detent To the right of the rotary encoders is a pictorial graphical aid depicting the pushing action of the encoder and the corresponding change in resolution Angular Rotation per Indication in top row Detent of LCD Display p 60 OF 15 00 Table 5 Angular rotational movement per detent and the corresponding display indication To Change Angular Resolution Press and release the left hand center and or right encoder knob one or more times The upper row of the display indicates the present resolution of each waveplate in degrees per detent Each pres
77. st GPIB settings to use LF as its command termination character The typical GPIB transaction begins with a command sent by the GPIB Bus controller otherwise known as your PC After receiving the command the MPC1 will process the request Requests typically ending in a IDN for example will invoke MPC1 to respond to the host Such a transaction will invoke MPC1 to raise the GPIB RQS line It is important that the host should look for this state change On receiving this indication the host will listen for the response from the MPC1 Failure to do so results in a GPIB bus error and requires a GPIB Device Clear to dismiss 1 888 91 FIBER toll free F i be rCo ntrol 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 34 An example LabView applet is included on the distribution CD to further illustrate this process A description of operation will be discussed later in this chapter 5 1 2 RS 232 Configuration To use RS 232 communications the following communications settings are necessary Baud Rate 57600 Parity Data Bits Stop Bits Handshaking Table 7 Hardware settings for RS 232 communication The standard command structure of the RS 232 equipped system is very similar to the GPIB configuration However the RS 232 interface system does differ Slightly in terms of return codes Most notably every keyst
78. the row of keys removes the MPC1 from remote GPIB control Prior to pressing the LOCAL key the word Remote is listed along the top most row the lower row of the LCD display shows the angular position of each waveplate directly in degrees i e 99 to 99 The lower line of the LCD screen will detail specifics of the Remote mode In RS232 serial control mode communications settings are posted to this lower line When in GPIB control mode the GPIB address is displayed in the lower portion of the LCD 1 888 91 FIBER toll free F i be rCo ntro 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web The LOCAL key provides a critical function to the MPC1 front panel When the MPC1 is controlled remotely the entire front panel interface is disabled except of course the LOCAL key As stated previously in remote controlled mode the LCD display displays Remote on the topmost line To disconnect from the remote controlling host the LOCAL key must be pressed In the case of the MPC1 M the left display controls optical channels 1 and 2 while the right display controls channels 3 and 4 It is possible to have either one or both of these sets i e 1 amp 2 and or 3 amp 4 independently operating under remote control In that case depressing the LOCAL key on the left display will disable from remote control channels 1 and 2 with
79. tion manual to be error free FC is not liable for consequential damages The warranty mentioned before does not cover errors and defects being the result of improper treatment software or interface not supplied by us modifications misuse or operation outside the defined ambient stated by us or unauthorized maintenance All further claims will not be consented to and will not be acknowledged FC does not explicitly warrant the usability or the economical use for any application FC reserves the right to change this instruction manual or the technical data of the described unit at any time Removal of any of the top and or bottom enclosure cover s screws even in only an effort to gain entry inside the enclosure nullifies the MPC1 series warrantee and incurs the risk of physical harm 1 888 91 FIBER toll free F i be rCo ntrol 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web Contact Information United States of America FiberControl P O Box 198 Holmdel New Jersey 07733 phone 1 732 332 1860 toll free 1 888 91 FIBER fax 1 732 332 1861 email info fibercontrol com Web http www fibercontrol com Call to obtain the ship to address Outside the U S A several distributors throughout the world also represent FiberControl Please refer to our web site or call our US based offices to ask for the nearest distributor 1 888 9
80. tions info fibercontrol com email www fibercontrol com web 56 Item B transmits the command via GPIB to the MPC1 There are two items of interest in this frame First notice the GPIB address is hard coded This may not suffice in your application It has been done this way only for clarity Secondly notice the function is devoid of a Mode assignment The default mode is correct 0 If you have any question about these particulars you may wish to consult with the LabView documentation Item C is the bus arbitration of the GPIB transaction This is a wait for the RQS indicator On receiving the RQS signal a GPIB bus signal line being toggled from high to low the GPIB Controller the PC is informed that it is time to receive Item D is the Receive function Once the RQS signal is raised it is necessary to receive the incoming packet from the MPC1 It should be stressed that this is the conservative approach to communicating to any instrument via GPIB Further a parallel scheme is available using the optional VISA abstraction layer within LabView Each command issued in this example has an identical VISA counterpart Finally this same general approach may be used when communicating to MPC1 using Visual Basic or C via a GPIB programming API The GPIB API for VB or C use these approximate equalities C VB ibdev LabView VISA OPEN C VB ibwrt LabView GPIB WRITE C VB ibwait
81. to register intervals as desired Programmed sequences repeat continuously therefore only unique waveplate positions need be set as intervals lf no Sequence is programmed no motion occurs Each Program has a maximum of 16 intervals but cannot be combined into longer interval sequences For longer sequences with more independent positions remote control can be used Waveplate rotational speed is dictated by the current rate setting Cannot be controlled programmed remotely Programs are saved in non volatile memory As stated before because of the enhanced AutoScan like capability offered in the remote control feature set e g speed and flexibility AutoScan is a front panel feature only not programmable or controllable remotely i e GPIB RS 1 888 91 FIBER_ toll free F i be rCo ntro 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 29 232 or BIM One advantage provided by this independent isolated set of interfaces is that it insures that the front panel memory pre sets are not inadvertently overwritten Please refer to section 5 for additional information on programming the enhanced AutoScan like feature Since the SOP scrambling capability is hard coded in the firmware it cannot be overwritten using with the programming procedure 4 2 9 5 Example AutoScan program Refer to Appendix A for an exa
82. via GPIB Exiting transparent mode can occur via one of three ways h The LOCAL key is pressed 2 The power is cycled on the MPC1 3 Transparent mode is exited via a command sent by the host computer to the MPC1 The two byte command should better be described as a single 16 bit value albeit broken into two 8 bit characters The general format is as follows lt MSB gt 76543210 76543210 lt LSB gt lt MSB gt AABBICCC DDDDDDDD lt LSB gt Leading first byte transmitted by host is AABBI1CCC Trailing second byte transmitted by host is DDDDDDDD In the bit sequence AA represents the command BB represents the CHANNEL Further CCCDDDDDDDD represents the VALUE Notice the VALUE is framed by 1 s This is critical MPC1 uses a delimiting 1 as a sanity check on transmission of a command If the host computer transmits a command without bit position Byte 0 bit 3 1 the command is discarded 1 888 91 FIBER toll free F i be rCo ntrol 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 60 5 6 1 Issuing a Motion Command in Transparent Mode The following command structure is used lt MSB gt 76543210 76543210 lt LSB gt lt MSB gt AABBICCC DDDDDDDD lt LSB gt AA 00 BB Channel 00 X 01 Y 10 Z 11 lt reserved gt CC DD 11 bit absolute position in steps A very important dist
83. zation Solutions info fibercontrol com email www fibercontrol com web 52 100000000 Oe 37 a pepo oOoOooeo n GPIB Address Figure 15 Implementation of Conditional GPIB Delay Use this Labview function to confirm MPC1 is ready to accept a new motion command before issuing a new command CONDITIONAL_GPIB_DELAY vi may be called in any Labview application by simply passing the GPIB address variable from your application to the CONDITIONAL Sub vi In programming the MPC1 via a VISA instrument interface VISA_CONDITIONAL_ DELAY vi may be called by passing the VISA context name to the function PADDLE CYCLE 2 vi The second sample LabView VI is a close variation to PADDLE _CYCLE_1 with the exception that all axes are given a move assignment simultaneously Only after all Lef vre waveplates are in motion will the conditional delay function be called 1 888 91 FIBER toll free F i be rCo ntrol 732 332 1860 telephone 732 332 1861 facsimile Lightwave Polarization Solutions info fibercontrol com email www fibercontrol com web 53 To further illustrate operation Step 1 Lef vre waveplate X is given an assignment of 99 Y 99 and Z 99 via the LabView GPIB Out command All waveplates begin moving Notice each command is separated by a short 50ms to 70ms delay This is recommended in any situation where multiple commands are rapidly issued Step 2 CONDITIONAL GPIB DELAY is again called Execution i

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