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SR470 Laser Shutter Controller

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1. Failed ROM Check The ROM checksum failed The firmware code is likely corrupted Meaning 110 111 112 113 Continues Illegal Command The command syntax used was illegal A com mand is normally a sequence of four letters or a followed by three letters Undefined Command The specified command does not exist Illegal Query The specified command does not permit queries Illegal Set The specified command can only be queried ASRS SR470 Shutter Controller 2 6 Error Codes Parsing errors continued Error Code Meaning 114 115 116 117 118 120 121 122 126 Null Parameter The parser detected an empty parameter Extra Parameters The parser detected more parameters than al lowed by the command Missing Parameters The parser detected missing parameters required by the command Parameter Overflow The buffer for storing parameter values over flowed This probably indicates a syntax error Invalid Floating Point Number The parser expected a floating point number but was unable to parse it Invalid Integer The parser expected an integer but was unable to parse it Integer Overflow A parsed integer was too large to store correctly Invalid Hexadecimal The parser expected hexadecimal characters but was unable to parse them Syntax Error The parser detected a syntax error in the com mand SR470 Shutter Controll
2. definition ij Integers tf Floating point numbers s Single ASCII character b Hexadecimal formatted byte s Required for queries illegal for set commands var Parameter always required var Required parameter for set commands illegal for queries var Optional parameter for both set and query forms IEEE 488 Commands CLS ESE i ESR IDN OPC PSC i RCL i RST SAV i SRE i STB TRG WAI 2 10 Clear Status 2 10 Standard Event Status Enable 2 10 Standard Event Status Register 2 11 Identify 2 11 Operation Complete 2 11 Power on Status Clear 2 11 Recall Instrument Settings 2 12 Reset the Instrument 2 12 Recall Instrument Settings 2 12 Service Request Enable 2 12 Status Byte 2 13 Trigger 2 13 Wait for Command Execution Status Reporting Commands CNTR INSE i INSR FLTS LERR TRGS 2 13 Counts Remaining 2 13 Instrument Status Enable 2 14 Instrument Status Register 2 14 Fault Status 2 14 Last Error 2 15 Trigger Status Instrument Control Commands 2 15 Abort Trigger in Progress 2 15 Assertion State 2 16 Auxiliary I O BNC 1 Configuration 2 16 Auxiliary I O BNC 2 Configuration 2 16 Auxiliary I O State 2 17 Alignment Mode 2 17 Display On Off 2 17 Enable Shutter ASRS SR470 Shutter Controller 2 1 Index of Common Commands 2 17 2 17 2 18 2 18 2 18 Mute Alarm Shutter Polarity Show Main Display Source of Control Open Closed
3. State Exposure Cycle Control Commands SPCN i SPPR i SPEX i SPPS i SPTL i SPFR i 2 19 2 19 2 19 2 19 2 19 2 19 2 19 2 19 2 19 2 19 2 20 2 20 2 20 2 20 2 20 2 20 2 20 2 20 Step Burst Count Step Predelay Step Exposure Step Postdelay Step Total Delay Step Frequency Step Size Burst Count Step Size Predelay Step Size Exposure Step Size Postdelay Step Size Total Delay Step Size Frequency Burst Count Frequency Predelay Time Exposure Time Postdelay Time Total Delay Time Shutter Specific Commands MODE i MODL RATE SCMD s b SERR SPOS SSER SSTB TEMP 2 20 2 21 2 21 2 21 2 21 2 21 2 21 2 21 2 22 Shutter Mode Shutter Model Maximum Rate Shutter Command Shutter Error Word Shutter Position Shutter Serial Number Shutter Status Byte Shutter Temperature Interface Commands EMAC EPHY 2 ilj IFCF ilj IFRS i LCAL LOCK UNLK 2 22 2 22 2 23 2 23 2 24 2 24 2 24 Ethernet MAC Address Ethernet Physical Layer Configuration Interface Configuration Interface Reset Go to Local Request Lock Release Lock SR470 Shutter Controller ASRS Remote Operation REMT XTRM iLJILK 2 24 Go to Remote 2 24 Set Interface Terminator ASRS SR470 Shutter Controller 2 2 Alphabetic List of Commands 2 2 Alphabetic List of Commands CLS 2 10 Clear Status ESE i 2 10 Standard Event Status Enable E
4. When an interface is reset all connections on that interface are reset to the power on state To reset the RS 232 interface use the and gt keys to switch from r5t no to r 5t YES and then press the Enter key The message r ESEE re will briefly display on the screen as confirmation that the inter face has been reset e Baud rate Two RS 232 baud rate choices are available on the SR470 Press the and gt keys to switch between bd 9600 and bd 516580 which indicate respectively that the RS 232 interface is at baud rate 9 600 baud or 57 600 baud A change in this parameter will not take effect until the SR470 is power cycled or the interface is reset 1 2 6 2 GPIB The GPIB menu can be accessed by pressing Shift GPIB Use A and V to navigate between menu items The menu items are e GPIB on or off Press the and gt keys to switch between 9P b on and 9P ib oFfF which indicate respectively that the GPIB interface is enabled or disabled A change in this parameter will not take effect until the SR470 is power cycled or the interface is reset SR470 Shutter Controller SRS Getting Started 1 2 6 3 Ethernet Interface reset When an interface is reset all connections on that interface are reset to the power on state To reset the GPIB interface use the and gt keys to switch from r5E no to rae SES and then press the Enter key The messag
5. as a manual input CHOP i Alignment Mode Set query alignment mode i e continuous chopping of shutter to i If parameter is 0 alignment mode is turned off If itis 1 alignment mode is turned on This command will fail if the instrument is in external level mode See 1 2 5 2 for more about alignment mode DISP i Display On Off Set query the display state to i If parameter is O the display is turned off If it is 1 the display is turned on See 1 2 5 6 for more about display blanking ENAB i Enable Shutter Set query the enable state of the shutter c to i If parameter is 0 the shutter is in sleep mode If it is 1 then shutter is powered on The query form will return 2 if a fault has been detected for the shutter The fault is cleared when the shutter is turned off Changing the state of a shutter from disabled to enabled takes 500 ms to complete See 1 2 2 4 for more about shutter head operation and standby modes MUTE i Mute Alarm Set query the mute status on the audible alarm If i is O alarms are audible If 1 alarms are muted See 1 2 2 5 and 1 2 5 1 for more about faults and alarms on the SR470 POLR i Shutter Polarity Set query the polarity of the shutter to i A value of 0 indicates the shutter is normally open A value of 1 indicates the shutter is normally closed See 1 2 2 2 for more about shutter polarity SR470 Shutt
6. ber sticker on the rear panel ASRS SR470 Shutter Controller 1 3 The SR470 Rear Panel 1 3 8 3 RS 232 The RS 232 interface connector is a standard 9 pin type D female connector configured as a DCE transmit on pin 3 receive on pin 2 The factory default communication parameters are set to 8 Data bits 1 Stop bit No Parity No Hardware Flow Control All of these parameters are fixed The interface is enabled or disabled and the baud rate is set from the front panel Please see 1 2 6 1 for more information SR470 Shutter chassis is internally Shutter Head connected to the cable shield N Optional grounding of cable shield ys e C Float e able b Ground i snutter A Figure 1 5 Grounding the shield of the shutter cable 1 3 9 Shutter grounding considerations For reliable operation of a shutter head connected to the SR470 it is essential that the shield of the cable to the shutter is properly grounded The grounding scheme for the shutter cable is shown in Fig 1 5 The cable connects a rear panel output to an external shutter head Inside the shutter head there is an electrical connection between its chassis case and the shield of the cable If the chassis of the shutter head is electrically connected to earth ground for example by way of attachment to a grounded optical table then the shield will be grounded as well The SR470 can internally connect the cable shield
7. is executed In either of these modes the control signals can be derived from internal or external sources Pressing the front panel Input Source key in the Mode section will cycle between the different operating modes 1 2 3 1 Internal triggered mode The SR470 is in the internal triggered mode when the front panel indicator INT TRIG in the Mode section is illuminated This mode should be selected to control the shutter state indepen dently of the rear panel TTL control input 1 3 3 internal triggered mode ignores that input While in this mode timed sequences may be initiated by pressing the front panel gt trigger button Direct state control of the shutter is also allowed in this mode the state can be changed by pressing the OPEN or CLOSE keys Please see 1 2 4 for more about timed sequences 1 2 3 2 External triggered mode 1 2 3 3 External level mode The SR470 is in the external triggered mode when the front panel indicator EXT TRIG in the Mode section is illuminated In this mode timed sequences may be initiated on the falling edge of a signal connected to the rear panel TTL control input Pressing the gt trigger key while in external triggered mode will force an immediate trigger and Forc tr 9 wil appear on the numeric display Pressing either m reset OPEN or CLOSE are requests for man ual control that will force the instrument out of EXT TRIG mode and back to
8. level no Fk WN Table 1 1 Shutter connector pinouts The pinout for the connector is shown in Fig 1 4 and the signal names are shown in Table 1 1 The shield of the shutter connector is connected to earth ground as it ships from the factory Please see 1 3 9 about grounding consid erations for more information 1 3 5 Aux I O ports The two rear panel Auxiliary I O BNC connector labeled Aux I O 1 and Aux I O 2 are multifunction I O ports that can be configured over any remote interface Each has specific capabilities please see 2 5 3 in the remote programming section for more information Both ports can be used for manual TTL level input or output and there are additional capabilities that include inhibiting triggers forc ing a shutter to the normal state or outputting a pulse when a trigger is issued The factory default setting for each is to be configured for manual control with high output The Aux I O ports are each internally pulled up to 5 VDC through a 10 kQ resistor Note The shields of these BNC connectors are connected to earth ground SR470 Shutter Controller 4S RS 1 22 Getting Started 1 3 6 Sync out 1 3 7 Alarm output 1 3 8 Remote interfaces 1 3 8 1 IEEE 488 GPIB 1 3 8 2 Ethernet This rear panel TTL output provides a logic signal that mirrors the commanded state of the shutter A high output is provided when the shutter is commanded to the open state and a
9. panel Alarm output 1 3 7 that is also asserted pulled low whenever the FAULT indicator is lit This is a fixed output and cannot be disabled The alarm functions are intended to help draw attention to fault conditions that might otherwise be difficult to detect For example if an enabled shutter head is disconnected that event will generate a fault The expected configuration of the SR470 is saved in non volatile memory such that if a shutter head is accidentally discon nected during a power outage a fault will be declared in that channel when power is restored and cannot be cleared by merely cycling the power Operator action is required to clear a fault condition As discussed in 1 2 2 3 a shutter fault can be cleared by pressing the m reset key Before the fault is cleared it is possible to display the error word for the shutter by pressing Shift Err Code This alternate function is located is above the Cancel key in the Modify section of the front panel Please see the manual for your shutter head for the meanings of possible error codes See also 2 6 for more about the error codes on the SR470 ASRS SR470 Shutter Controller 1 2 Front Panel Operation 1 2 3 Operating modes The SR470 has several distinct operating modes The most basic mode distinction is between direct state control where the shutter is explicitly commanded to open or close versus triggered control where a timed sequence
10. shutter and returns the response 2 5 6 Interface Configuration Commands EMAC Ethernet MAC Address Query the SR470 s ethernet MAC address EPHY i j Example Example Ethernet Physical Layer Configuration Set query the physical configuration item i to j The parameter i may be one of the following i Configuration O Enable disable Auto negotiation of link speed 1 Set link speed to 10 Base T or 100 Base T When auto negotiation is enabled the manual link speed selection is ignored When auto negotiation is disabled the manual speed selection is used to configure the link Under certain circumstances the auto negotiation of link speed may fail To avoid this the SR470 defaults to manually configured 100 Base T link speed When setting the link speed a value of j equal to 0 selects 10 Base T and a value of 1 selects 100 Base T EPHYSO 0 CR Disable auto negotiation of link speed EPHYS1 1 CR Manually configure link for 100 Base T operation ASRS SR470 Shutter Controller 2 5 Command List IFCF 11 5 Example Example Example Interface Configuration Set query interface configuration parameter i to j The parameter i may be one of the following Configuration parameter RS 232 Baud Rate disable enable RS 232 Baud Rate 9600 or 57600 GPIB disable enable GPIB address Disable Enable TCPIP interface Disable Enable Raw Socket access on port 5025
11. shutter head to determine this interval and if either Texp or Tpost is shorter than the opening closing time the Limit enunciator to the left of the numeric display will be illuminated Delay times can be selected to be as low as 1 ms for both of these parameters even if that is less than the opening closing time The maximum rate which is related to the opening closing time can be queried over the remote interface please see 2 5 5 There are two possible frameworks delay priority and frequency pri ority for entering timing parameters which depend upon whether the individual delay times are the most important parameters or on whether the complete sequence duration is the most important parameter We will discuss these separately in the next two sections The default framework for entering timing information is called de lay priority In delay priority mode the user may directly enter the three timing delay parameters Tpre Texp and Tpost If these values are changed the total sequence duration Tota will change as an elastic parameter remaining equal to the sum of Tpre Texp and Tpost The frequency f also changes since f 1 T total In this framework Tiota and f might best be regarded as read only values since it is not obvious which of the three component delays should be altered when the the total is changed 1 2 4 4 Frequency priority mode A second timing framework is called frequency priority In fre quency priori
12. state 1 2 2 2 e The OPEN key commands an attached and operational shut ter head to go to the open state e The CLOSE key commands an attached and operational shut ter head to go to the closed state These buttons can affect the operational mode 1 2 3 of the SR470 Pressing either m reset OPEN or CLOSE are requests for man ual control that will force the instrument to the INT TRIG mode Pressing the gt trigger key while the instrument is in the EXT TRIG mode will not change the mode but will force a trigger even though it remains in the externally triggered mode ASRS SR470 Shutter Controller 1 2 Front Panel Operation 1 2 2 2 Shutter polarity 1 2 2 3 Shutter status An SR470 Series Laser Shutter head may be operated either as a nor mally open N O or normally closed N C shutter The normal state refers to the unasserted state of the shutter which is for exam ple the state in which the shutter idles when a trigger has not yet come The polarity may be selected by pressing Shift N O or Shift N C These alternate shifted functions are located above the 1 and 2 keys in the Modify section of the front panel The currently selected shutter polarity is indicated on the timing diagram near the center of the SR470 front panel On the left hand side of the diagram one of the two indicators N O or N C will be lit to indicate the polarity The shutter opera
13. the INT TRIG mode The SR470 is in the external level mode when the front panel indicator EXT LVL in the Mode section is illuminated In this mode the state of the shutter is controlled only by the level of the rear panel TTL control input When the input is high unasserted the shutter is commanded to be in the Normal state SR470 Shutter Controller ASRS Getting Started When the TTL input is low asserted the shutter is commanded to be in the Normal state Pressing either m reset OPEN or CLOSE are requests for man ual control that will force the instrument out of EXT LVL mode and back to the INT TRIG mode The gt trigger key has no effect while in external level mode 1 2 4 Timing and sequences 1 2 4 1 Timing diagram The SR470 is capable of controlling an attached shutter head through timed sequences of operation including triggered bursts Sequences are allowed when the shutter is powered on and the SR470 is in the INT TRIG or EXT TRIG operating mode 1 2 3 The se quence does not begin until a trigger is received the trigger source may be the front panel gt trigger key the rear panel TTL control input if in EXT TRIG mode or a trigger command from one of the remote interfaces The front panel TRIGGER indicator located next to the gt key remains illuminated for the duration that any timed sequence is in progress The timing diagram for the instrument appears on
14. the SR470 Shutter Controller is the rear panel BNC input labeled Control Input This connector accepts an ex ternally generated logic level input signals It is internally pulled up to 3 3 VDC through 100 kQ and is compatible with 5 VDC TTL input signals The input is active low and the response to the input signal is mode dependent When the SR470 Shutter Controller is in the INT TRIG mode 1 2 3 the control input is ignored In EXT TRIG mode a trigger is generated when a low going edge is detected on the input In the EXT LVL mode a signal that is unasserted i e logically high or open disconnected commands the shutter to its Normal state and an input signal that is asserted i e pulled low commands the shutter to its normal state Note The shield of the input BNC is connected to earth ground The SR470 has one shutter connector which provides power and interface connections for an external SR470 Series Laser Shutter head Never connect the shutter output port to anything other than an SR470 Series Laser Shutter head ASRS SR470 Shutter Controller 1 3 The SR470 Rear Panel 1 21 Figure 1 4 Shutter connector pinout as seen looking into the con nector on the rear panel Connector Pin Description 1 12 V to shutter head Coil power supply Ground TX Serial to shutter head RX Serial from shutter head 4 5 V to shutter head Logic power supply Control signal to shutter head logic
15. the front panel and is reproduced here Tpre N O R anne open N C closed T total Figure 1 2 Timing diagram The sequence represents a single exposure cycle with a predelay Tpre exposure of length Texp and postdelay Tpost The length of these intervals combined is Tiota the total duration of the sequence There are two curves drawn on the timing diagram one for normally open operation 1 2 2 2 and one for a normally closed operation the curves are labeled by designations N O and N C Suppose that the shutter is idle in its normal state and in the INT TRIG or EXT TRIG mode when a new trigger signal is received The timed sequence begins when the trigger is received During the first part of the sequence the predelay the shutter remains in its normal ASRS SR470 Shutter Controller 1 2 Front Panel Operation 1 9 state At the end of the predelay the exposure time begins As illustrated on the timing diagram the exposure is defined to begin at the moment that the shutter begins moving from the normal to the Normal asserted state The shutter remains commanded to the asserted state until the end of the exposure time The postdelay follows the exposure and is defined to begin at the moment that the shutter head begins to return to the normal state The SR470 is able to accept new triggers after the end of the postdelay As a concrete example consider the case with a shutter that h
16. to ground or leave it floating as selected by an internal jumper for each channel The factory default setting is to ground the shield for each of the four shutter channels If a shutter head is properly grounded and thereby providing a suit able ground to the cable shield it may be desirable to remove the shield ground connection for the shutter cable inside the SR470 GROUND a FLOAT Figure 1 6 Shutter cable ground selection header Part a shows the cable shield grounded at the SR470 with the jumper over the two pins marked GROUND and part b shows the cable ground floating where the jumper sits over the two pins marked FLOAT SR470 Shutter Controller ASRS Getting Started La WARNING The procedure for removing shield ground connection inside the SR470 is as follows First turn off and unplug the unit Wait one minute after removing power to reduce the risk due to residual volt ages inside the instrument To remove the top cover first remove the four large screws from the top cover of the instrument The cover can now be removed by carefully sliding it back towards the rear of the instrument while tilting it up from the rear The ground connection for the cable shield is in the form of a three pin header which is located adjacent to the shutter output connector A two pin jumper on the header selects whether the cable shield is in the grounded or floating configuration as illus
17. until queried by this command at which point they are cleared The status bits have the following definitions Bit Meaning 0 Trigger set when shutter is triggered 1 End of cycle set after post delay completes 2 End of burst set after post delay completes and no more cycles remain 3 OPEN set when the shutter transitions from closed to open 4 CLOSE set when the shutter transitions from open to closed 5 RATE set when the controller receives a trigger while a cycle is still in progress FLTS Fault Status Query the current fault status of the shutter This command may return the following fault responses Code Meaning 0 No fault 1 Disconnect fault 2 Fault reported by shutter 3 12 V power fault If the shutter reported a fault use the SERR command to identify the cause Example FLTS CR 1 A return of 1 indicates that the shutter head is disconnected LERR Last Error Query the last error in the error buffer Errors are returned on a first in first out basis Upon executing a LERR query the returned error is removed from the error buffer See the section Error Codes later in this chapter for a description of the possible error codes returned by LERR The error buffer has space to store up to 20 errors If more than 19 errors occur without being queried the 20 error will be 254 Too Many Errors indicating that errors were dropped ASRS SR470 Shutter Controller 2 5 Command List TRGS Trigger
18. Disable Enable Telnet access on port 5024 Disable Enable VXI 11 access Set Query Static IP Address 9 Set Query Subnet Address Network Mask 10 Set Query Default Gateway oF WNF Oj gt COND Set j to 0 to disable a setting and 1 to enable it Parameters 8 10 require an IP address in the form a b c d where each letter is a decimal integer in the range 0 255 Parameters 47 indicate the active IP configuration IFCF 6 0 CR Disable Telnet Access IFCF 8 192 168 10 5 CR Set IP address to 192 168 10 5 IFCF 10 CR 192 168 10 1 The returned value indicates the active default gateway IFRS i Interface Reset Reset one of the communications interfaces The parameter identi fies the interface to reset i Configuration parameter 0 RS 232 1 GPIB 2 TCP IP When an interface is reset it is changed to its power on state SR470 Shutter Controller ASRS Remote Operation LCAL Go to Local Revert to local control of the instrument This enables the front panel key pad for instrument control This command is only active on telnet raw socket and RS 232 connections The other interfaces have built in functionality for implementing this functionality LOCK Request Lock Request the instrument lock The SR470 returns 1 if the lock is granted and 0 otherwise When the lock is granted no other instru ment interface may alter instrument settings until the lock is released via the U
19. Getting Started m OPEN or CLOSED will cause the SR470 to attempt to enable the shutter head and move it to the open or closed position as requested If the head powers on successfully the SR470 will display its state with either the OPEN or CLOSED indicator If the shutter head instead encounters a fault the SR470 will remove power to the shutter head and illuminate the FAULT indicator Again this fault condition can be cleared by pressing the m reset key The shutter logic power supply at 4 5 VDC is always provided to a connected shutter when the SR470 is powered on regardless of the operational state of the shutter head This provides power for diagnostics and serial communications It is separate from the 12 VDC power supply that drives the motor coil in an attached shutter head When the shutter is said to be powered down e g in sleep mode it is the 12 VDC power supply that is disconnected from the shutter head Because power is not available to change the position of the shutter blade the blade position is therefore indeter minate 1 2 2 5 Shutter faults and alarms The SR470 is equipped with audible and electronic alarms that are asserted whenever the front panel FAULT indicator is lit The audible alarm is a continuously emitted loud siren like noise It can be enabled or muted by pressing the Alarm in the Utility section of the front panel see 1 2 5 1 The electronic alarm is a rear
20. MSS reflects the fact that at least one of the enabled summary bits is set ASRS SR470 Shutter Controller 2 5 Command List TRG Trigger Trigger the controller to start an exposure cycle This command fails if the shutter is under external level control Otherwise it attempts to trigger the shutter A rate error may occur if a cycle is already in progress WAI Example Wait for Command Execution The instrument will not process further commands until all prior commands including this one have completed WAI CR Wait for all prior commands to execute before continuing 2 5 2 Status Reporting Commands CNTR Counts Remaining Query the counts remaining in the burst of cycles If no trigger is in progress or the last cycle is in progress the command will return 0 If the count is infinite it will return 1 INSE i Instrument Status Enable Example Set query the instrument status enable register to The instru ment status enable register determines which bits of the instrument status register get ORd together to set INSR_BIT in the serial poll status byte see STB INSE 3 CR When a trigger or an end of cycle occurs the INSR_BIT of the serial poll status byte will be set SR470 Shutter Controller ASRS 2 14 Remote Operation INSR Instrument Status Register Query the instrument status of the controller The bits are sticky once set they remain set
21. NLK command or the power is cycled It also forces a com plete lockout of the front panel UNLK Release Lock Release a previously acquired instrument lock Returns 1 if the lock was released otherwise 0 If UNLK returns 0 and it is necessary to verify that the instrument is not presently locked from any other interface acquire the lock with LOCK before executing the UNLK query REMT Go to Remote Enable remote control of the instrument In this mode the front panel key pad is disabled so that control of the instrument can only occur via the remote interface This command is only active on telnet raw socket and RS 232 connections The other interfaces have built in functionality for implementing this functionality XTRM iL JLK Example Set Interface Terminator Set the interface terminator that is appended to each response to j k The default terminator is CR LF i e ASCII character 13 followed by ASCII character 10 The interface terminator may be set to a different sequence of up to three characters in length by executing XTRM with parameters that consist of the decimal equivalent of the ASCII characters desired separated by commas XTRM 65 66 13 Set the interface terminator to AB CR ASRS SR470 Shutter Controller 2 6 Error Codes 2 6 Error Codes The SR470 contains an error buffer that stores up to 20 error codes associated with errors encountered during power on
22. Operation Manual Shutter Controller SR470 SRS Stanford Research Systems Revision 1 0 e April 7 2009 Certification Stanford Research Systems certifies that this product met its published specifications at the time of shipment Warranty This Stanford Research Systems product is warranted against defects in materials and workman ship for a period of one 1 year from the date of shipment Service For warranty service or repair this product must be returned to a Stanford Research Systems authorized service facility Contact Stanford Research Systems or an authorized representative before returning this product for repair Information in this document is subject to change without notice Copyright Stanford Research Systems Inc 2009 All rights reserved Stanford Research Systems Inc 1290 D Reamwood Avenue Sunnyvale CA 94089 USA Phone 408 744 9040 e Fax 408 744 9049 www thinkSRS com e e mail info thinkSRS com Printed in U S A Document number 9 01634 903 SRS SR470 Shutter Controller Contents General Information Safety and Preparation for Use Eine Nolasco dera e Se lie es a ee Line Cord and Grounding asa A et wes Thine Fuse soit ok he eee BOS allt a sie as SENIE a ee BS ie A RE a ae eh ee ek eae Environment 4 dsc ae a o e bik Ged a A Laser Safety A oe Re ee ae MS a a Luk Skt ge hia dk INGfatlone disor a ae T a sal Specifications opi E e a NS 1 Getting Starte
23. Operation in other environments may cause damage to the product To reduce the risk of fire or electrocution do not expose this product to rain or excessive moisture Be careful not to spill liquid of any kind onto or into the product Certain hazards are always present when working with laser radia tion Visible and invisible beams of light have the potential to cause serious bodily injury including blindness or death and to cause sig nificant damage to property While the SR470 is designed for use with laser systems it is fully the users responsibility to ensure that safe operating conditions are maintained and to provide for fail safe operation whenever an equipment failure could lead to a hazardous situation SR470 Shutter Controller ASRS vi General Information Symbols you may Find on SRS Products Alternating current Caution risk of electric shock Frame or chassis terminal Caution refer to accompanying documents Earth ground terminal 4s RS SR470 Shutter Controller General Information vii Notation A WARNING A CAUTION The following notation will be used throughout this manual A warning means that injury or death is possible if the instructions are not obeyed A caution means that damage to the instrument or other equipment is possible Typesetting conventions used in this manual are e Front panel buttons are set as Button e Front panel indicators are set as Remote e Remote c
24. PPR i SPPS SPTL i SRCE i SSCN i STAT i 2 21 Shutter Command 2 21 Shutter Error Word 2 18 Show Main Display 2 19 Step Burst Count 2 19 Step Exposure 2 19 Step Frequency 2 21 Shutter Position 2 19 Step Predelay 2 19 Step Postdelay 2 19 Step Total Delay 2 18 Source of Control 2 19 Step Size Burst Count 2 21 Shutter Serial Number 2 19 Step Size Exposure 2 20 Step Size Frequency 2 19 Step Size Predelay 2 19 Step Size Postdelay 2 21 Shutter Status Byte 2 20 Step Size Total Delay 2 18 Open Closed State ASRS SR470 Shutter Controller 2 2 Alphabetic List of Commands T TEMP 2 22 Shutter Temperature TEXP t 2 20 Exposure Time TOTL t 2 20 Total Delay Time TPRE t 2 20 Predelay Time TPST t 2 20 Postdelay Time TRGS 2 15 Trigger Status U UNLK 2 24 Release Lock X XTRM iLL 2 24 Set Interface Terminator SR470 Shutter Controller ASRS 2 8 Remote Operation 2 3 Introduction 2 4 Commands 2 4 1 Command syntax The SR470 may be remotely programmed via the GPIB interface the RS 232 serial interface or the LAN ethernet interface using a simple command language documented in this chapter Any host computer interfaced to the SR470 can easily control and monitor the operation of the SR470 The SR470 interface configuration is determined by configuration parameters stored in nonvolatile memory At power on the instru ment returns to the state it was la
25. SR 2 10 Standard Event Status Register IDN 2 11 Identify OPC 2 11 Operation Complete PSC i 2 11 Power on Status Clear RCL i 2 11 Recall Instrument Settings RST 2 12 Reset the Instrument SAV i 2 12 Recall Instrument Settings SRE i 2 12 Service Request Enable STB 2 12 Status Byte TRG 2 13 Trigger WAI 2 13 Wait for Command Execution A ABRT 2 15 Abort Trigger in Progress ASRT i 2 15 Assertion State AUXC 1 2 16 Auxiliary I O BNC 1 Configuration AUXC 2 2 16 Auxiliary I O BNC 2 Configuration AUXI i j 2 16 Auxiliary I O State C CHOP i 2 17 Alignment Mode CNTR 2 13 Counts Remaining COUN i 2 20 Burst Count D DISP i 2 17 Display On Off E EMAC 2 22 Ethernet MAC Address ENAB i 2 17 Enable Shutter EPHY i j 2 22 Ethernet Physical Layer Configuration F FLTS 2 14 Fault Status FREQ f 2 20 Frequency IFCF i j 2 23 Interface Configuration SR470 Shutter Controller ASRS Remote Operation IFRS i 2 23 Interface Reset INSE i 2 13 Instrument Status Enable INSR 2 14 Instrument Status Register L LCAL 2 24 Goto Local LERR 2 14 Last Error LOCK 2 24 Request Lock M MODE i 2 20 Shutter Mode MODL 2 21 Shutter Model MUTE 1 2 17 Mute Alarm P POLR i 2 17 Shutter Polarity R RATE 2 21 Maximum Rate REMT 2 24 Go to Remote S SCMD s b SERR SHOW i SPCN i SPEX i SPFR i SPOS S
26. Status Query the triggered status of the controller The bits have the follow ing meanings Code Meaning 0 Idle Bits 0 1 1 PreDelay 2 Exposure 3 PostDelay Code Meaning 0 Open Bits 2 3 1 Closed 2 Indeterminate 3 Indeterminate 2 5 3 Instrument Control Commands ABRT Abort Trigger in Progress Abort any trigger in progress and return the shutter to the unasserted state Any trigger received subsequent to this command will trigger anew cycle ASRT i Example Example Assertion State Set query the assertion state of the shutter to The set version forces the shutter to the given state by canceling any trigger in progress and changing the trigger source to internal trigger mode If the parameter i is 0 the shutter is unasserted i e commanded to the normal state If it is 1 the shutter is asserted ASRT CR Place the shutter in the unasserted state ASRT CR 1 A return of 1 indicates that the shutter is asserted i e commanded to the normal state SR470 Shutter Controller ASRS Remote Operation Auxiliary I O BNC 1 Configuration Set query the auxiliary configuration of the AUX I O 1 rear panel BNC connector to The parameter controls the configuration according to the following table i Configuration Manual Configuration State controlled by AUXI command 1 Master Inhibit Shutter forced to normal unasserted state when AUX I O 1 inpu
27. ample IDN CR Stanford_Research_Systems SR470 s n004025 ver1 00 OPC Operation Complete The set form sets the OPC flag in the ESR register when all prior commands have completed The query form returns 1 when all prior commands have completed but does not affect the ESR register PSC i Power on Status Clear Set query the Power on Status Clear flag to i The Power on Status Clear flag is stored in nonvolatile memory in the SR470 and thus maintains its value through power cycle events If the value of the flag is 0 then the Service Request Enable and Standard Event Status Enable Registers SRE ESE are stored in non volatile memory and retain their values through power cycle events If the value of the flag is 1 then these two registers are cleared upon power cycle Example PSC 1 CR Set the Power on Status Clear to 1 Example PSC CR 1 Returns the current value of Power on Status Clear RCL i Recall Instrument Settings Recall instrument settings from location i The parameter i may range from 0 to 9 Locations 1 to 9 are for arbitrary use Location 0 is used for current instrument settings It is continually updated after each key press instrument settings and restored upon power on See SAV for a list of settings that are restored Example RCL 3 CR Recall instruments settings from location 3 SR470 Shutter Controller ASRS Remote Operation RST Example Reset the Instrument Res
28. as a fixed opening closing time of 10 ms configured in normally closed mode with pre delay of 500 ms exposure of 50 ms and postdelay of 10 s Further suppose that the shutter is in the closed state when a trigger is received 500 ms after the trigger is received the shutter begins to open and is fully opened 510 ms after the trigger Since the exposure time is 50 ms the shutter begins to close at 550 ms after the trigger and is fully closed 10 ms later The postdelay of 10 s begins at the moment that the shutter begins to close and finishes at a time 10 550 s after the trigger was received The actual opening closing time of a shutter is hardware and possibly mode dependent please consult the user manual for your shutter head 1 2 4 2 Entering timing parameters Timing parameters on the SR470 can be configured and viewed by using the three keys in the Timing section of the front panel in conjunction with numeric controls in the Modify section of the front panel The Tpre Tpost key allows the operator to view and edit the pre delay and postdelay Pressing this key alternates between selecting those two delays and indicator lights to the left of the numeric dis play indicate which of the two delays is shown The Texp key and the T Total key allow the operator to view and edit the exposure time and total duration of the sequence The frequency f of the full cycle is defined as f 1 Ttotal and may be accesse
29. d 1 1 Introduction to the Instrument 1 2 Front Panel Operation edo e rr dra 1 3 TheSR470 Rear Panel 2 Remote Operation 2 1 Index of Common Commands 2 2 Alphabetic List of Commands 2 Introduction eaoin A Bw alas De aes 24 Commands aya a sd dd se 2 5 Command List 2 6 Error Codes ii Contents ASRS SR470 Shutter Controller General Information The SR470 Shutter Controller is a flexible instrument capable of pow ering controlling and providing I O interfaces for an external SR470 Series Laser Shutter head Shutter control modes include manual control from the front panel control by an external TTL signal and control by internal timing including triggerable bursts Remote operation is supported with GPIB RS 232 and Ethernet com puter interfaces All instrument functions can be controlled and read over any of the interfaces Shutter faults are automatically detected and result in audible visible and electronic alarms 111 iv General Information Safety and Preparation for Use La WARNING A CAUTION Line Voltage Line Cord Line Fuse Service Dangerous voltages capable of causing injury or death are present in this instrument Use caution whenever the instrument covers are removed Do not remove the covers while the unit is plugged into a live outlet Never connect any of the shutter output port
30. d by selecting Shift Frequency For each of these selections the appropriate indicator Texp Ttotal or Freq is illuminated to the left of the numeric display when that parameter is displayed If the sequence timing has been entered as a set of delays measured in seconds then it is important to note that the frequency shown in hertz on the numeric display may be truncated since the true frequency is equal to 1 Tio a1 and may have trailing digits that do not fit on the display As an example if a timed sequence were set up with SR470 Shutter Controller ASRS Getting Started 1 2 4 3 Delay priority mode Ttotal 3 s then the true frequency would be f 0 3333 Hz but Shift Frequency would only display 0 333 Hz This does not mean that the timing is degraded to match the displayed frequency only that there are additional digits not shown Similarly if the operator should set up a sequence timing with a frequency as the controlling parameter for example by entering 3 Hz then the full precision of the SR470 would be dedicated to producing true 3 Hz cycles while the delay times would be the parameters that may be truncated for display Because the exposure and postdelay portions of the timing sequence each contain a transition between the open and closed states the minimum practical value for those two delays is given by the actual opening closing time of the shutter head The SR470 queries the
31. e r ESEE 9b will briefly display on the screen as confirmation that the inter face has been reset GPIB Address The SR470 GPIB address may be set to any value from 0 to 30 The current value will be displayed as for example Addr 8 when the GPIB address is 8 Press the and gt keys to adjust the address number A change in this parameter will not take effect until the SR470 is power cycled or the interface is reset The SR470 comes standard with an RJ 45 network communications port located on the rear panel The port may be used to communicate with the SR470 over a 10 100 Base T ethernet connected network or LAN Any changes to the interface configuration will not take effect until the SR470 is power cycled or the interface is reset The ethernet menu can be accessed by pressing Shift ENet Use A and V to navigate between menu items The menu items are Ethernet interface on or off Press the and gt keys to switch between Ec on and Ec of F which indicate respectively that the ethernet TCP IP inter face is enabled or disabled Interface reset When an interface is reset all connections on that interface are reset to the power on state To reset the eth ernet interface use the and gt keys to switch from ASRS SR470 Shutter Controller 1 2 Front Panel Operation r5E no to r5E YES and then press the Enter key The message r ESEE bev will briefly displa
32. ection of the front panel To enter a value simply type the new value using the keypad and complete the entry by hitting one of the two units keys ms s or Hz depending on context These unit names are labeled on the right hand sides of their respective keys If a quantity is unitless like burst count the Enter key should be pressed to enter the value If an entry error is made pressing the Cancel key returns the pre vious value Numeric parameters may also be increased or decreased with the arrow keys Pressing the A up arrow key will increase the value by the current step size while pressing while the V down arrow key will decrease the value by the current step size If the entered value is outside of the allowable limits for the parameter the instrument will beep and display an error message Each numeric parameter has an associated step size which may be an exact power of 10 1 ms 10 ms or 100 ms for example or may be an arbitrary value If the step size is an exact power of 10 that digit of the display will flash Ifit is not an exact power of 10 the flashing digit is of the same magnitude as the leading digit of the step size A flashing underscore may be used to represent the flashing digit if that digit is a hidden leading zero SR470 Shutter Controller ASRS Getting Started Pressing the Step Size key displays the step size for the current parameter which may be changed by typing and ent
33. elay Tpre by the current step size in the direction given by i If is 1 step up if i is 0 step down SPEX i Step Exposure Step the exposure Texp by the current step size in the direction given by i If i is 1 step up if i is 0 step down SPPS i Step Postdelay Step the postdelay Tpost by the current step size in the direction given by i If i is 1 step up if i is 0 step down SPTL i Step Total Delay Step the total sequence length Tiota by the current step size in the direction given by i If i is 1 step up if i is 0 step down SPFR i Step Frequency Step the frequency f by the current step size in the direction given by i If i is 1 step up if i is 0 step down SSCN i Step Size Burst Count Set query the burst count step size to i SSPR t Step Size Predelay Set query the predelay step size to t in seconds SSEX t Step Size Exposure Set query the exposure step size to t in seconds SSPS t Step Size Postdelay Set query the postdelay step size to t in seconds SR470 Shutter Controller ASRS Remote Operation SSTL t Step Size Total Delay Set query the total sequence length step size to t in seconds SSFR f Step Size Frequency Set query the frequency step size to f in hertz COUN i Burst Count Set query the burst count to If the burst count is 1 the burst coun
34. eletype font while responses received the host computer from the SR470 are setas slanted teletype font The usage examples vary with respect to set query and optional parameters These examples are not exhaustive but are intended to provide a starting point for user programming SR470 Shutter Controller ASRS 2 10 Remote Operation 2 5 Command List 2 5 1 Common IEEE 488 2 Commands CLS Example Clear Status CLS Clear Status immediately clears the ESR register as well as the LERR error buffer CLS ESE i Standard Event Status Enable Set query the Standard Event Status Enable register to i Bits set in this register cause ESB in STB to be set when the corresponding bit is set in the ESR register ESR Example Standard Event Status Register Query the Standard Event Status Register Upon executing a ESR query the returned bits of the ESR register are cleared The bits in the ESR register have the following meaning Bit Meaning OPC operation complete Reserved OYE query error DDE device dependent error EXE execution error CME command error Reserved 7 PON power on Ou uNa a ESR CR 176 The returned value of 176 27 2 24 indicates that PON CME and EXE are set ASRS SR470 Shutter Controller 2 5 Command List IDN Identify Read the device identification string returns a string similar to the following Ex
35. er ASRS 2 28 Remote Operation 2 6 5 Communication Errors Error Code Meaning 170 Communication Error A communication error was detected This is re ported if the hardware detects a framing or parity error in the data stream 171 Over Run The input buffer of the remote interface over flowed All data in both the input and output buffers will be flushed 2 6 6 Other Errors Error Code Meaning 254 Too many errors The error buffer is full Subsequent errors have been dropped SRS SR470 Shutter Controller
36. er Controller ASRS Remote Operation Show Main Display Set query the main front panel display to The parameter i has the following interpretation Display Pre delay Post delay Exposure Total delay Frequency Burst count v PWN FP j gt SRCE i Source of Control Set query the shutter control source mode to The parameter i has the following interpretation i Source 0 Internal level INT TRIG 1 External triggered EXT TRIG 2 External level EXT LVL See 1 2 3 for details about these modes Example SRCE 2 CR Place shutter under external level control STAT i Open Closed State Set query the open closed state of the shutter to i The set ver sion forces the shutter to the given state by canceling any trigger in progress and changing the trigger source to internal triggered mode If the parameter is equal to 0 the shutter is closed if it is 1 it is opened The query form returns the number 2 if the shutter state is indeterminate Example STAT 0 lt CR Close the shutter Example STAT CR 2 A return of 2 indicates that the shutter 2 is in an indeterminate state ASRS SR470 Shutter Controller 2 5 Command List 2 5 4 Exposure Cycle Control Commands SPON i Step Burst Count Step the burst count by the current step size in the direction given by i Ifi is 1 step up if i is 0 step down SPPR i Step Predelay Step the pred
37. eric display will display for example ALE 0 to indicate that alternative mode 0 is currently selected The arrow keys or numeric keypad can then be used to change the value Important note Alternate mode settings are stored in the volatile memory of the shutter head not in the SR470 the mode setting is lost whenever the SR470 or the shutter head is unplugged powered down or otherwise reset Press Shift Disp Off to temporarily blank the front panel indica tors This function is not actually in the Utility section but is instead in the numeric keypad area When blanking is turned on all front panel LEDs will go dark except for the Disp Off enunciator located to the left of the numeric display SR470 Shutter Controller To turn the display back on press any key SRS Getting Started 1 2 5 7 Error code display Turning off the display may be helpful because it prevents front panel indicators such as OPEN and CLOSED from blinking syn chronously with shutter operation a potential nuisance in certain laboratory environments As discussed in 1 2 2 5 it is possible to display the error code in the event of a shutter fault by pressing Shift Err Code SR470 errors for example communications errors are indicated by the lighted word ERROR to the left of the numeric display If this enunciator is lit Shift Err Code will display the SR470 error If the message is too long to fit on the disp
38. ering a new value Pressing Step Size again returns the display to the previously displayed parameter Pressing the A up arrow or lt left arrow while the step size is displayed increases the step size to the next larger decade while pressing the V down arrow or gt right arrow key will decrease the step size to the next smaller decade 1 2 2 Master control and basic shutter operation 1 2 2 1 The Master section of the front panel located on the left hand side contains some of the most important and frequently used controls on the SR470 There are four keys in this section trigger m reset OPEN and CLOSE Each of these keys has an associated indicator LED and there is also a FAULT indicator located between the OPEN and CLOSED indicators In introducing these features we will discuss many aspects of manual shutter control Keys and normal operation When the SR470 has an attached shutter head that is powered on and functioning properly the four keys in the Master section have the following functions e The gt trigger key instructs the SR470 to initiate a predefined timed sequence of operation which may be a single open ing closing cycle a finite burst or continuous operation Note This key is ignored if the instrument is in the EXT LVL mode 1 2 3 3 e The m reset key cancels any timing sequence trigger in progress and resets the shutter to the unasserted or normal
39. et 10 100 Base T 0 C to 40 C non condensing 90 VAC to 260 VAC 47 Hz to 63 Hz 85 W max 6lbs Operating Temperature Power Physical Weight Dimensions 8 25 W x 4 Hx11 D SR470 Shutter Controller ASRS x General Information 4s RS SR470 Shutter Controller 1 Getting Started In This Chapter This chapter gives you the necessary information to get started quickly with the SR470 Shutter Controller 1 1 Introduction to the Instrument 1 2 141 1 VOWORVIEW recedes eR eg A a 1 2 1 1 2 Power on state 1 2 1 2 Front Panel Operation 1 2 1 21 at Enya So oO A As 1 2 1 2 2 Master control and basic shutter operation 1 4 1 2 3 Operating modes i opta 1 7 1 2 4 Timing and sequences 1 8 1 2 5 Utility functions aoaaa 1 12 1 2 6 Remote interface configuration 1 14 1 2 7 Remote lockout and front panel operation 1 18 1 2 8 Restoring factory default configuration 1 18 1 3 The SR470 RearPanel 1 19 LSL POWEr ena ocenama RS BE ee a 1 20 1 3 2 Chassis ground es re 1 20 1 3 3 TILINPUT sons Rend ai se sie ae E e G 1 20 1 3 4 Shutterconnector 0 4 1 20 1 35 UX VO DOMS 4 0 e Sach ary tek os g aes 1 21 1 3 6 SyYNGOUE sets aed A eee 1 22 1 3 7 Alarm output a e PS we 1 22 1 3 8 Remoteinterfaces 1 22 1 3 9 Shutter grounding considerations 1 23 1 2 Getti
40. et the SR470 to default configuration This is equivalent to press ing Shift Defaults from the front panel or power cycling the unit with the Reset key depressed See 1 2 8 for a list of the factory default settings RST CR SAV i Example Recall Instrument Settings Save instrument settings to location i The parameter may range from 0 to 9 Locations 1 to 9 are for arbitrary use Location 0 is reserved for current instrument settings This location is overwritten after each key press and restored upon power on See 1 2 5 4 for a list of the settings that are saved SAV 3 CR Save current instruments settings to location 3 SRE i Service Request Enable Set query the Service Request Enable register to i Bits set in this register cause the SR470 to generate a service request when the corresponding bit is set in the STB register STB Example Status Byte Query the standard IEEE 488 2 serial poll status byte The bits in the STB register have the following meaning Bit Meaning Shutter disconnected Shutter fault INSR_BIT Unmasked Instrument Status Bit Reserved MAV message available ESB ESR summary bit MSS master summary bit 7 Reserved OouFWNFEF SO STB CR 114 A return of 114 indicates that Shutter fault MAV ESB and MSS are set MAV indicates that a message is available in the output queue ESB indicates that an enabled bit in ESR is set
41. ing Mode Utility and Modify Many of the SR470 s operating parameters are simple commands or mode selections for example to open the shutter or select internally triggered mode for which there is no numeric entry Setting the SR470 s numeric operating parameters is done by first pressing the key with the desired parameter s name on it Burst for example to set the burst count Some parameters and functions are labeled above the keys in light gray To display these values first press the Shift key and then the labeled key Shift Sleep for example powers down an attached shutter head putting it into standby mode ASRS SR470 Shutter Controller 1 2 Front Panel Operation SRS Align ERROR MASTER TRIGGER RESET OPEN Stanford Research Systems Disp REM IPAddr Tpre Tex Tpost N O p p P f open t closed aint N C T total Model SR470 Shutter Controller Cont Count Tpre Freq Texp Limit Ttotal Tpost MOD FY E 9 lt _ AN MODE UTILITY RS 232 GPIB ENet Ready 4 5 6 SHIFT gt Z Mute EXT LVL Input Source N C Defaults SHE FAULT aleli i CLOSED Continuous Disp Off Err Code Local alia i Hz 1 2 1 1 Step Size Figure 1 1 The SR470 front panel Numeric values are changed through the numeric keypad or the arrow keys in the Modify s
42. ith 25 byte buffers allocated to each of up to3 parameters per command If the command buffer overflows both the input and output buffers will be flushed ASRS SR470 Shutter Controller 2 4 Commands 2 9 2 4 1 1 Examples and reset If a parameter buffer overflows a command error will be generated and the offending command discarded Commands are terminated by either a semicolon a CR ASCII 13 or a LF ASCII 10 If the communications interface is GPIB then the terminating character may optionally be accompanied by an EOI signal If the EOI accompanies a character other than a LF a LF will be appended to the command to terminate it Execution of the command does not begin until a command terminator is received White space is ignored Aside from communication errors commands may fail due to either syntax or execution errors Syntax errors can be detected by looking at bit 5 CME of the event status register ESR Execution errors can be detected by looking at bit 4 EXE of the event status register In both cases an error code indicating the specific cause of the error is appended to the error queue The error queue may be queried with the LERR command Descriptions of all error codes can be found in the section Error Codes starting on page 2 25 Commands may be given with a simple example illustrating their usage In these examples all data sent by the host computer to the SR470 are setas straight t
43. lay the and gt keys can be used to reveal the whole message If there are multiple errors use the A and V keys to view the additional messages The ERROR enunciator will remain lit while there are still unviewed error messages The list of SR470 error codes is in 82 6 1 2 6 Remote interface configuration 1 2 6 1 RS 232 The remote interfaces of the SR470 RS 232 GPIB and Ethernet can be configured from the front panel The user interface for these three configurations is different from data entry elsewhere on the SR470 in that it is menu driven Within each configuration use the A and V keys to navigate between menu items parameters and the and gt keys to choose between different values or to scroll through long IP address parameters The SR470 comes standard with an RS 232 communications port located on the rear panel of the SR470 For more information about this port please see 81 3 8 3 The RS 232 menu can be accessed by pressing Shift RS 232 Use A and V to navigate between menu items The menu items are e RS 232 on or off Press the and gt keys to switch between rede on and rede off ASRS SR470 Shutter Controller 1 2 Front Panel Operation 1 15 which indicate respectively that the RS 232 interface is enabled or disabled A change in this parameter will not take effect until the SR470 is power cycled or the interface is reset e Interface reset
44. low output is given when the shutter is commanded to the closed state Note The shield of this BNC connector is connected to earth ground The Alarm Out rear panel BNC connector is a TTL output that is normally held high at 5 VDC This signal is asserted driven low whenever the front panel FAULT indicator is lit The Alarm output port is always active The polarity of the signal is such that the SR470 will no longer hold the Alarm signal at 5 VDC in the event that it loses line power Note The shield of this BNC connector is connected to earth ground Remote operation of the SR470 is supported with GPIB RS 232 and Ethernet computer interfaces All configuration options are settable from the front panel 1 2 6 or over the remote interface For additional information about the remote interface configuration please see 1 2 6 The SR470 comes with an IEEE 488 port for communicating over GPIB The port is located on the rear panel of the SR470 The GPIB address is configured from the front panel please see 1 2 6 2 for more information The SR470 comes standard with an RJ 45 network communications port located on the rear panel The port may be used to communicate with the SR470 over a 10 100 Base T ethernet connected network or LAN The SR470 supports static network configuration as configured from the front panel please see 81 2 6 3 for more information The ethernet hardware MAC address is printed on the serial num
45. mode The timing diagram discussed in 1 2 4 1 represents a single exposure cycle with an exposure bracketed by a predelay and postdelay A burst consists of a set of single exposure cycles that are triggered continuously one after the other The burst count the number of cycles that will execute after a trigger is received can be accessed by pressing the Burst located in the Mode section of the front panel When selected the enunciator Count will be illuminated to the left of the numeric display and the value will be displayed Using the keypad and arrow keys any value between 1 the default value a single cycle and 99 999 999 can be entered As a special case of using bursts it is also possible to configure the SR470 to cycle forever after a trigger is received This is called infinite burst or continuous mode and can be selected by press ing Shift Continuous When this mode is selected the word inf in iE E will appear on the numeric display and the enunciator Cont on the left of the numeric display will light up and remain lit so long as continuous mode is selected It is also possible to enter continuous mode using the A and V arrow keys by adjusting to a value less than 1 or greater than 99 999 999 Exit continuous mode by entering a nonzero finite value for the burst count SR470 Shutter Controller ASRS 1 12 Getting Started 1 2 4 6 Indicators on the timing diagram 1 2 5 U
46. n TTL Ethernet RS 232 DCE 8 N 1 10 100 9600 57 6 k Baud SRS Stanford Research Systems Output To Shutter Model SR470 Shutter Controller Made in USA CAUTION P Connect only ABS Si n a shutter heads Figure 1 3 The SR470 rear panel 1 3 The SR470 Rear Panel The rear panel of the SR470 see Figure 1 3 provides input and output connectors for controlling the shutter a TTL sync output an alarm output two auxiliary I O ports a chassis grounded binding post three remote interfaces and the power entry module SR470 Shutter Controller 4S RS Getting Started 1 3 1 Power entry 1 3 2 Chassis ground 1 3 3 TTL input 1 3 4 Shutter connector A CAUTION The SR470 serial number and ethernet MAC address are printed on a label located on the back side The power entry module is located on the upper left side of the rear panel and contains an integrated power switch The universal input power supply of the SR470 accommodates any voltage in the range 90 VAC to 260 VAC witha frequency in the range 47 Hz to 63 Hz The SR470 has a detachable three wire power cord for connection to the power source and to a protective ground The exposed metal parts of the instrument are connected to the outlet ground to protect against electrical shock Always use an outlet which has a properly connected protective ground This binding post is connected to the SR470 chassis and to earth ground The primary input for
47. ng Started 1 1 Introduction to the Instrument 1 1 1 Overview 1 1 2 Power on state The SR470 Shutter Controller is a full featured timing generator and driver for SR470 Series Laser Shutters It features multiple control modes and is ideally suited for laser shutter applications where flex ible and precise timing generation is needed It can be operated independently as a stand alone instrument or integrated with exist ing automated test and measurement equipment The basic function of the SR470 Shutter Controller is to provide power control signals and I O interfaces to an SR470 Series Laser Shutter The shutter connects to an output on the rear panel of the instrument and can be controlled by rear panel TTL level inputs or manually from either the front panel or remote interfaces The SR470 stores its operation state in non volatile memory includ ing the configuration of the remote interfaces and the position state of a connected shutter At power on the SR470 will return to its previous configuration after a brief system check and initialization 1 2 Front Panel Operation 1 2 1 Data Entry The front panel of the SR470 Figure 1 1 provides controls for the operator and displays the operational state of the shutter at a glance The upper half of the panel has a multifunction numeric LED display as well as a timing diagram The lower half of the panel has controls that are divided into five sections Master Tim
48. numeric display will light up and remain lit so long as alignment mode is selected Alignment mode is transient and only lasts until another feature of the SR470 is accessed that affects the shutter state Operation of the Shift key which is used to select the functions printed in gray above the keys is described in 1 2 1 ASRS SR470 Shutter Controller 1 2 Front Panel Operation 1 2 5 4 Store and Recall Press the Store key followed by a number i and the Enter key to store the current configuration in memory location i The parameter imay range from 1 to 9 Location 0 is reserved for current instrument settings and is overwritten after each key press The following settings are saved 1 Whether the shutter is in sleep mode 2 Shutter polarity 3 Trigger mode 4 All trigger delay settings and step sizes 5 Alarm Mute Audible selection 6 Display on off state Press the Shift Recall key followed by a number i and the Enter key to recall and restore configuration i The parameter i may range from 0 to 9 1 2 5 5 Alternate shutter modes 1 2 5 6 Display Blanking SR470 Series Laser Shutters may have alternate operation modes available for example alternate speed modes The possible modes are numbered 0 through 3 and their function is hardware dependent please see the shutter head operation manual for details To configure the shutter to operate in an alternate mode press Shift Align The num
49. ommand names are set as IDN e Literal text other than command names is set as OFF Remote command examples will all be set in monospaced font In these examples data sent by the host computer to the SR470 are set as straight teletype font while responses received by the host computer from the SR470 are set as slanted teletype font SR470 Shutter Controller ASRS viii General Information Specifications Operation Shutter Type Shutter Output Shutter State Shutter Polarity Control Modes Manual Control Timing Sequence Bursts Sync Output Alignment Mode Gate Inhibit Fault Detection and Reporting Display Blanking Remote Operation SR470 Series Laser Shutters Drives one shutter Open or closed controlled either manually from front panel inputs or from external TTL input User selectable for normally open or nor mally closed operation Internally or externally triggered with timing generation direct external level control or manual Front panel OPEN and CLOSED buttons command shutter to the corresponding state RESET button commands shutter to its Nor mal state Pre delay exposure time post delay Each time interval may be set independently with 0 1 ms resolution up to 9 999 9999 seconds Timing sequence may be repeated after a trigger from 1 to 99 999 999 times or continuously The rear panel Sync Our TTL signal mirrors whether the shutter is presen
50. one of the remote interfaces It recalls the following setup Shutter enabled not in sleep mode Trigger mode INT TRIG Polarity N C Tpre 0 Tep 15 Tpost 1s Burst count 1 All delay step sizes 0 1s Frequency step size 0 1 Hz CANADUTKRWNE ASRS SR470 Shutter Controller 1 3 The SR470 Rear Panel 1 19 10 Count step size 1 11 Aux I O configuration Manual high 12 Alarm Audible 13 Display On Recalling factory default settings this way does not affect the interface configuration The interface configuration can be restored to factory defaults by power cycling the unit with the ENet 6 key pressed In this case the following interface setup is recalled RS 232 Enabled RS 232 baud rate 9600 GPIB Enabled GPIB address 8 TCP IP interface Enabled IP Address 0 0 0 0 Subnet 0 0 0 0 Router 0 0 0 0 Link speed 100 Base T VXI 11 Telnet and Raw socket interfaces enabled WCOANDUFRWNE j O DANGEROUS VOLTAGES INSIDE FOR USE BY QUALIFIED LABORATORY PERSONNEL ONLY SEE OPERATION MANUAL FOR ADDITIONAL SAFETY NOTICES IEEE 488 GPIB Inverted logic Control Input e Input High Open Reset Normal state e Input Pulled Low Set Normal state e Triggers accepted on falling edge Chassis oes Ground Aux 1 0 1 Aux I O 2 Alarm Out Sync Out 90 to 264 VAC 47 to 63 Hz O r y High OK y High Open y i Low Fault Low Closed TTL TTL T
51. played on that line As with the router configuration use the to display the mask value and use the keypad to enter a new value e Static IP address When this menu item is selected the numeric display of the SR470 will show PAddr indicating that the IP address is displayed on that line As with the router and subnet configurations use the to display the address and use the keypad to enter a new value 1 2 7 Remote lockout and front panel operation When a host computer accesses the SR470 over one of the remote interfaces it normally places the unit in the Remote state where most manual input is not allowed This is indicated by the REM enunciator located to the left of the numeric display To return to front panel operation from Remote mode press the Local key this is the same key as Enter The SR470 can also be placed into complete lockout mode by using the LOCK query over a remote interface In this mode the REM indicator is lit but the instrument will not respond to any front panel input including the Local key This mode can only be disabled using the UNLK query over a remote interface as described in 82 5 6 or by cycling the power to the instrument 1 2 8 Restoring factory default configuration The SR470 can be reset to its factory default settings by pressing Shift Defaults or by power cycling the unit with the Reset key depressed This is equivalent to sending the RST command over
52. s to anything besides an SR470 Series Laser Shutter head The universal input power supply of the SR470 accommodates any voltage in the range 90 VAC to 260 VAC with a frequency in the range 47 Hz to 63 Hz The SR470 has a detachable three wire power cord for connection to the power source and to a protective ground The exposed metal parts of the instrument are connected to the outlet ground to protect against electrical shock Always use an outlet which has a properly connected protective ground The shields of the six rear panel BNC ports the rear panel Chassis Ground binding post and the metal chassis of the instrument are all connected to Earth through the power line outlet ground There are two line fuses internal to the SR470 that may not be serviced by the user If no front panel LEDs are lit when line power is applied and the power switch is in the on position contact Stanford Research Sys tems Do not attempt to service or adjust this instrument unless another person capable of providing first aid or resuscitation is present Do not install substitute parts or perform any unauthorized modi fications to this instrument Contact the factory for instructions on how to return the instrument for authorized service and adjustment ASRS SR470 Shutter Controller General Information Environment Laser Safety La WARNING This product is intended for use only in a clean and dry laboratory environment
53. self tests com mand parsing or command execution The ERR LED will be high lighted when a remote command fails for any reason The errors in the buffer may be read one by one by executing successive LERR commands The meaning of each of the error codes is described below 2 6 1 Execution Errors Error Code Meaning 0 No Error No more errors left in the queue 10 Illegal Value A parameter was out of range 11 Illegal Mode The action is illegal in the current mode This might happen for instance if alignment mode is enabled when a shutter is under external level control 12 No Shutter Response A query was made to a shutter but it didnt re spond 15 Bad Shutter Response A query was made to a shutter but the response was not in the expected format 15 Not Allowed The requested action is not allowed because the instrument is locked by another interface SR470 Shutter Controller ASRS 2 26 Remote Operation 2 6 2 Query Errors Error Code Meaning 30 32 2 6 3 Device Dependent Errors 2 6 4 Parsing Errors Error Code Lost Data Data in the output buffer was lost This occurs if the output buffer overflows or if a communi cations error occurs and data in output buffer is discarded No Listener This is a communications error that occurs if the SR470 is addressed to talk on the GPIB bus but there are no listeners The SR470 discards any pending output Meaning 40 Error Code
54. shutter is an SR475 shutter This command sends X to the shutter and returns the response RATE Maximum Rate Query the maximum rate at which the shutter can operate A return of 100 would indicate that it can operate at 100 Hz This command sends R to the shutter and returns the response SCMD s b Example Shutter Command Send ascii bytes s followed optionally by hex bytes b to the shutter Send back the shutter response if the query form is used SCMD T CR 35 Send the ASCII byte T to shutter 1 and return the response This returns the shutter temperature SERR Shutter Error Word Query the shutter error word This command sends W to the shutter and returns the response SPOS Shutter Position Query the shutter position A value of 1 indicates the shutter is open A value of 0 indicates the shutter is closed A value of 1 indicates the shutter position is indeterminate This command sends S to the shutter and returns the response SSER Shutter Serial Number Query the shutter serial number This command sends Y to the shutter and returns the response SSTB Shutter Status Byte Query the shutter status byte This command sends Z to the shutter and returns the response SR470 Shutter Controller ASRS Remote Operation TEMP Shutter Temperature Query the current board temperature in C This command sends T to the
55. st in when power was removed Exceptions are noted in the command descriptions These parame ters can be changed from the front panel as detailed in 1 2 6 or via the IFCF command over a remote interface This section provides syntax and operational descriptions for remote commands Communications with the SR470 uses ASCII characters All com mands are 4 characters long and are case insensitive Standard IEEE 488 2 defined commands begin with the character followed by 3 letters SR470 specific commands are composed of 4 letters The four letter mnemonic shown in CAPS in each command se quence specifies the command The rest of the sequence consists of parameters Commands may take either set or query form depending on whether the character follows the mnemonic Set only com mands are listed without the query only commands show the 4 after the mnemonic and optionally query commands are marked with a Parameters shown in and are not always required Parameters in are required to set a value and are omitted for queries Parameters in are optional in both set and query commands Parameters listed without any surrounding characters are always required A parameter denotes an integer value Restrictions limiting the range of valid values will be noted in the command description Do NOT send or or as part of the command The command buffer is limited to 255 bytes w
56. t is asserted low 2 Trigger Inhibit Shutter ignores all trigger sources when the AUX I O 1 input is asserted low Example AUXC 1 2 CR Configure Aux I O 1 as Trigger Inhibit input AUXC 2 Auxiliary I O BNC 2 Configuration Set query the auxiliary configuration of the AUX I O 2 rear panel BNC connector to i The parameter i controls the configuration according to the following table i Configuration Manual Configuration State controlled by AUXI command 1 Reset Shutter aborts any trigger in progress on the falling edge of the AUX I O 2 input Pulse width must be at least 200 us 2 Trigger Out AUX I O 2 output is asserted low for 100 us at the beginning of each trigger cycle within a burst 3 Trigger Busy AUX I O 2 output is asserted low at time of first trigger and stays low until all cycles are complete Example AUXC 1 2 CR Configure Aux I O 1 as Trigger Inhibit input AUXI i j Auxiliary I O State Set query the Aux I O i BNC port state to j where i is either 1 or 2 The set form sets the value applied to the BNC when it is configured for manual I O The query form always reads the current value of the BNC A value of 0 indicates the BNC is logic low A 1 indicates the BNC is logic high ASRS SR470 Shutter Controller 2 5 Command List 2 17 Note that the input hardware has a positive pull up resistor the port should be configured to the high state for use
57. t will be infinite Otherwise valid burst counts range between 1 a single cycle and 99 999 999 See 1 2 4 5 for more information about bursts FREQ f Frequency Set query the frequency to f If valid adjust the postdelay Tpost to provide the requested frequency TPRE t Predelay Time Set query the predelay to t in seconds TEXP t Exposure Time Set query the exposure to t in seconds TPST t Postdelay Time Set query the postdelay to t in seconds TOTL t Total Delay Time Set query the total sequence length to t in seconds 2 5 5 Shutter Specific Commands MODE i Shutter Mode Set query the alternate mode for the shutter to i Valid modes range from 0 to 3 with zero being the default mode The set form sends the byte 0 1 2 or 3 to the shutter The effect of different modes is hardware dependent please see the shutter head manual for descriptions of the available modes The query form returns bits 12 and 13 of the shutter status byte see SSTB ASRS SR470 Shutter Controller 2 5 Command List 2 21 Since the mode setting is stored in the volatile memory of the shutter head not in the SR470 the mode setting is lost whenever the SR470 or the shutter head is reset or re enabled MODL Shutter Model Query the model number for the shutter This should return some thing like SR475 if the
58. tility functions 1 2 5 1 Alarm key 1 2 5 2 Align key 1 2 5 3 Shift key The timing diagram on the front panel of the SR470 serves not only as an illustration of the different time intervals but also as an indicator As mentioned earlier the N O or N C label on the diagram will be lit to indicate the configured polarity of the shutter Additionally the labels Tpre Texp and Tpost on the diagram will each illuminate in sequence to indicate which phase of a sequence is currently being executed Note it is possible to disable the front panel LEDs see 1 2 5 6 Several useful features of the SR470 are located in or near the Util ity section of the front panel The Alarm key toggles the configuration of the SR470 audible alarm between the states of Ready and Mute As discussed in 1 2 2 4 and 1 2 2 5 the audible alarm is active whenever the front panel FAULT indicator is lit unless the alarm is muted The fault condition causing the alarm can usually be cleared by pressing the m reset key The Align key enables a special alignment mode where the shutter is commanded to chop open and close at a rate of approximately 1 Hz This mode is intended to help facilitate mechanical alignment and identification of shutter heads This function is only available when connected shutter head is enabled and in one of the triggered modes either INT TRIG or EXT TRIG 81 2 3 The enunciator Align to the left of the
59. tional status may be determined by looking at the OPEN FA ULT and CLOSED indicators in the lower left hand corner When an SR470 Series Laser Shutter head is plugged in powered and operating properly either the OPEN or CLOSED will be lit showing the position of the shutter blade Note It is possible to disable the front panel LEDs see 1 2 5 6 The FAULT indicator on the SR470 may be lit either if the shut ter head reports a fault or if the shutter head is unexpectedly un plugged The fault indicator may be cleared by pressing the m reset key Pressing m when a fault condition is present will power down the shutter head if attached and turn offthe OPEN FAULT and CLOSED indicators See also 81 2 2 5 for more information about faults and alarms When all three of the OPEN FAULT and CLOSED indicators are off that indicates that there is not presently a shutter head that is both plugged in and powered If there is not a shutter head present the words n O HE Ad will usually be displayed on the nu meric display If a shutter head is present but powered off the word GLEEP may be appear on the seven segment display 1 2 2 4 Turning on the shutter head It is possible to manually power down the shutter head by pressing Shift Sleep When a shutter head is plugged in but not powered on it is said to be in standby also known as sleep mode From this state pressing SR470 Shutter Controller ASRS
60. tly commanded to the open or closed state Front panel Align button active when in man ual mode opens and closes shutter at 1 Hz chop ping rate to assist with mechanical alignment The rear panel Aux I O 1 port can be configured to allow or disallow TTL control depending on the value of the input TTL level Automatic detection of shutter disconnect or fault with front panel indicator LED Rear panel TIL Alarm output plus audible alarm which can be muted from the front panel Front panel LEDs can be disabled All instrument functions are controllable over GPIB RS 232 and Ethernet interfaces ASRS SR470 Shutter Controller General Information ix Electrical and Mechanical Shutter Outputs Voltages 12 VDC 4 5 VDC Current limits 1 50 A max 12 VDC 0 5 A max 4 5 VDC Signal lines Serial TX Serial RX logic level control Connector type Mechanically compatible with 6 pin IEEE 1394 cables Cable length 10 ft 3 m max Cable shield T O ports Control input Grounded or floating internal jumper TTL compatible rear panel input BNC connector internally pulled up to 3 3 VDC through 100 KQ Auxiliary I O Two rear panel BNC connectors TTL level multi purpose Alarm output Interfaces Shutter output One rear panel TTL output BNC connector One rear panel shutter connector Host interface RS 232 DB 9 female DCE GPIB Ethern
61. trated in Fig 1 6 Replace the cover of the instrument and re install the four cover screws before once again attaching it to power Dangerous voltages capable of causing injury or death are present in this instrument Use extreme caution whenever the instrument covers are removed Do not remove the covers while the unit is plugged into a live outlet ASRS SR470 Shutter Controller 2 Remote Operation In This Chapter This chapter describes operating the SR470 over its remote interfaces 2 1 2 2 2 3 2 4 2 5 2 6 Index of Common Commands 2 2 Alphabetic List of Commands 2 5 Introduction nso a es Be as be RE RR es 2 8 Commands gt is Se Bi sede Bas AOD Sew eR BES 2 8 2 4 1 Command syntax 0 2 8 Command List 2 10 2 5 1 Common JEEE 488 2 Commands 2 10 2 5 2 Status Reporting Commands 2 13 2 5 3 Instrument ControlCommands 2 15 2 5 4 Exposure Cycle Control Commands 2 19 2 5 5 Shutter Specific Commands 2 20 2 5 6 Interface Configuration Commands 2 22 Error Codes iria ed 2 25 2 6 1 Execution Errors 2 25 20 2 Query Errors Lo OS 2 26 2 6 3 Device Dependent Errors 2 26 26 4 Parsing Errors oi eine aw a 2 26 2 6 5 Communication Errors 2 28 2 6 6 Other Errors 2 28 2 2 Remote Operation 2 1 Index of Common Commands symbol
62. ty mode the total sequence duration Tiota or equiv alently f 1 Ttotal is considered to be the most important timing parameter while Tpost is considered to be the elastic parameter The SR470 enters into frequency priority mode when the operator enters ASRS SR470 Shutter Controller 1 2 Front Panel Operation 1 11 a value for either f or Tiota This can be performed with the A or V arrow keys or by typing a valid value and entering it It is not necessary that the entered value be different from the existing value but note that a new Titota must be greater than or equal to Tpre Texp and that a corresponding rule applies to a new value of f Once in frequency priority mode changes to Tpre or Texp will not change Tiotal which remains constant but will instead only change the value of the elastic parameter Tpost Entering a new value for Total or f will similarly affect the value of Tpost but leave Tpre or Texp unchanged An error message will be displayed if a timing value is requested that is not possible by changing only Tpost for example if Tpre Texp Tpost 1 s and Titota Were requested to be changed from 3s tol1s To exit frequency priority mode and restore delay priority mode enter a value for Tpost As with entering a value for Tota to enter the mode this can be performed with the A or V arrow keys or by typing a valid value changed or not and entering it 1 2 4 5 Bursts and continuous
63. y on the screen as confirmation that the inter face has been reset Interface speed The SR470 link speed may be selected to 10 Base T 100 Base T or to auto negotiate between these speeds Use the and gt keys to choose between 5Pd 15 for speed 10 Base T SPd 100 for speed 100 Base T and SPd Auto for auto negotiation Under certain circumstances Auto negotiation of link speed may fail To avoid this the SR470 defaults to manually config ured 100 Base T link speed Default router configuration When this menu item is selected the numeric display of the SR470 will show routEr be indicating that the router address is displayed on that line The IPAddr enunciator to the left of the numeric display is also lit while displaying IP addresses Use the key to scroll over and display the full router ad dress which might be for example 127 0 0 1 A valid router address consists of four sets of numbers in the range 0 to 255 separated by dots decimal points To enter a new router type the new value with the keypad including the dots and press the Enter key If the entry is invalid the instrument will beep and the error message iP Err will appear briefly on the numeric display Subnet address network mask When this menu item is se SR470 Shutter Controller lected the numeric display of the SR470 will show SRS Getting Started SubnEt indicating that the subnet mask is dis

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