User`s Manual - Stanford Research Systems
Contents
1. The face to face separation between the boards is 0 736 Figure 1 4 0 736 SSW 1xx 01 G D TSW 1xx 15 G D n E Pen DW xx 09 G D 350 1 n Av LO RSS AAA Figure 1 4 Single wide module with daughter board Two header options are shown Two possible interconnect schemes are also suggested in the figure both based on SAMTEC 0 100 headers The upper scheme uses a dual inline DIL header with extra long pins option 15 in the part number while the lower one uses a board stacker header a sec ond polymer block holds the pins stable This second option will likely cost more but the pins will be more stable for the blind mat ing of the two boards 1 3 2 Double wide SIM9B2 The double wide module bracket has unique top and bottom parts with board mounting tabs only on the module left hand side for supporting the main PCB The suggested method for mounting is to use a set of 0 625 female female threaded standoffs to support a daughter board to the interior side of the main board tabs see Fig ure 1 5 Long mounting screws are used on the main PCB 5 16 min length to come through the PEM nut and into the standoff the daughter board is then screwed to the interior side of the standoffs ASRS SIM9B1 amp SIM9B2 SIM Prototype Kits 1 4 Blank Panels 1 7 1 4 Blank Panels Be careful when removing the screws holding the main PCB these will2. 6 Blank Panels 223 got RU ale BOS 1 7 Bill of MaterialS 1 10 1 2 SIM Mechanical Interface 1 1 Exterior Specifications The overall depth of a SIM module is 7 000 the overall height is 3 600 The single wide module is 1 460 wide while the double wide all units are inches is 2 960 wide The slots in the Mainframe are on a 1 500 pitch 3 600 L a a Figure 1 1 Isometric sketch of a generic single wide SIM module The backmost bottom ventilation slot is used as a catch for the Main frame retention latch Towards the end of the inwards travel as a module is inserted the latch is deflected down by the module cen ter bracket This part of the module bracket is an unpainted bright nickel plated patch which will establish chassis ground before any pins on the DB 15 connector mate Once the module is fully inserted SRS SIM9B1 amp SIM9B2 SIM Prototype Kits 1 2 Main PCB 1 3 1 2 Main PCB the latch is captured in the slot The latch might extend slightly into the interior volume of the module perhaps as much as 0 025 If installing a custom printed circuit board PCB the module hard ware has fixed mounting points for holding the board and its key component the DB 15 connector Figure 1 2 gives the dimensions and key locations for full size PCB installation in either the single wide SIM9B1 or the double wide SIM9B2 Figure 1 3 provides orientation for the mounting of the PCB a
3. are intended as the quiet supplies for analog cir cuitry They are both produced with 3A linear regulators in the Mainframe If your design will present a significant AC load from either of these supplies you should be careful to ad equately bypass 24 V Unlike the other 4 supplies 24 V is not generated by the Mainframe DC to DC power supply Rather it is passed through directly from the universal input switching supply that provides primary power for the Mainframe The present Mainframe design has a 4 5 A 24V supply Since it does not come from the DC to DC supply the 4 24 V is by far the most efficient supply available to the modules and any significant power circuits should be operated from it if possible Since it does not come from a linear regulator though it has the worst ripple of any of the supplies The cooling fan in the Mainframe is also operated from this supply SIM modules do not require the Mainframe for operation the user shoul keep d be able to provide DC power to the 15 pin connector To this option as viable as possible module designers may want to consider minimizing the number of distinct supply voltages used The provi REF 10MHZ signals are complementary 0 5V square waves ded by the SIM Mainframe for clock synchronization The ASRS SIM9B1 amp SIM9B2 SIM Prototype Kits 2 3 Special Topics 2 5 two motivations for providing these signals are 1 to distribute a known goo
4. DE uae 1 4 BlankPanels 0 2 0000 4 15 Billof Materials llle 2 Circuit Guidelines 2 1 Connector Specification 2 5 y meee X VIRES 22 Connector Pin 0Ut 2 9 Special Topics ado e moy RUE ees ii Contents ASRS SIM9B1 amp SIM9B2 SIM Prototype Kits General Information Service and Warranty Preparation for use The SIM9B1 and SIM9B2 Prototyping Kits part of Stanford Research Systems Small Instrumentation Modules family offers users a con venient path to integrating custom circuits into an existing SIM900 Mainframe system Two models are available SIM9B1 is a single wide blank module while SIM9B2 is a double wide blank module In their as delivered form from the factory these are immediately usable as empty slot fillers for the SIM900 Mainframe For users wishing to populate these with custom circuits the following chapters provide details on the mechanical and electrical interfaces While the SIM9B1 and SIM9B2 are provided with the intention of user customization Stanford Research Systems is unable to provide any service or repair of customized modules Warranty coverage for these products extends only for unmodified products and covers de fects in materials and workmanship The SIM9B1 and SIM9B2 modules are designed to be used inside the SIM900 Mainframe Do not turn on the power to the SIM900 until the module is fully inserted into the mainframe and locked i
5. Operation and Service Manual SIM Prototype Kits SIM9B1 amp SIM9B2 SRS Stanford Research Systems Revision 1 0 e April 3 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 01642 903 f SRS SIM9B1 amp SIM9B2 SIM Prototype Kits Contents General Information Service and warranty e ei Ee A BAe Wee wes Preparation for use 4 2 a c tee 2 bse Ge gy Da d Ris Symbols iit wed due adum Ae RUE ee A Specticalionsc a sek So VU RP epe Ata 1 SIM Mechanical Interface 1 1 Exterior Specifications i 2 394 9 x oes XR US 1 27 Maii PEB suce quedo Renee rh Wee etd Lo Daughter Boards aude sp xo E RE
6. a module by asserting the break signal After Reset or device clear communications should default to 9600 8 N 1 RTS CTS The STATUS signal is a one bit out of band message that a SIM module can send to the Mainframe to indicate that some pre defined event has occured Modules manufactured by SRS typically imple ment the IEEE 488 2 status model for these modules the STATUS signal is controlled by the Status Byte register Module designers are free to re define STATUS to reflect any ap propriate single bit message such as Overload or Triggered See page 2 2 for discussion of driving the STATUS signal SIM9B1 amp SIM9B2 SIM Prototype Kits SRS
7. be jammed by the combined threads of the PEM nut and standoff The daughter board might need to be removed first and then the standoff loos ened before removing the main PCB so as to not strip the screws 0 755 gt m ae i top bracket 7 01380 P TSW 1xx 15 G D DW xx 09 G D 400 EC SSW 1xx 01 G D E n ni Y RAF 2059 550 A O 0 00992 e e 8 0 625 Y e e e e e e H bottom bracket 7 01381 C Figure 1 5 Double wide module with daughter board Two header options are shown If a larger board to board gap is needed substi tute 0 993 11 16 standoff in place of 0 992 5 8 standoff and TSW 1xx 17 for TSW 1xx 15 longer header this will change the gap from 0 755 to 0 817 The same two interconnect schemes are possible as before using the PEM hardware the face to face board separation is slightly greater than the single wide case For the double wide this gap is 0 755 Other schemes such as transverse daughter boards are possible The prototype kits SIM9B1 and SIM9B2 are each provided with two blank front panels Users can modify these parts to accomodate con nectors such as BNC or D connectors to interface custom circuitry with external signals SIM9B1 amp SIM9B2 SIM Prototype Kits SRS SIM Mechanical Interface While it is also possible to modify the rear panels for user connec ti
8. d timebase from the Mainframe to timing sensitive modules such as function generators and 2 to avoid drifting beat note effects between free running oscillators in different modules at nominally the same frequency Remember that all SIM modules must be able to work independent of the Mainframe so a good de sign will not require the REF_10MHZ signals for operation Custom user applications may deviate from this design rule if operation in the SIM900 Mainframe is always assured For custom designs that depend on the REF 10MHZ signals for op eration users should be careful that the signals are enabled on the SIM900 Mainframe Switch 2 on the rear panel DIP switch should be in the on position to guarantee distribution of the REF 10MHZ signals Since a module could be operated at the end of a cable from the Mainframe keeping the load on REF 10MHZ and REF_10MHZ balanced will minimize the common mode 10 MHz power appear ing on the cable 2 3 4 Asynchronous communications 2 3 5 Status SIM modules communicate with a user s computer through the SIM Mainframe using an RS 232 style asynchronous protocol UART hardware built into most microcontrollers provides the actual bit shifting function while hardware flow control is implemented in firmware Unlike true RS 232 signal levels are 0 amp 5 V signal po larity however follows the RS 232 convention A special device clear signal can be sent from the Mainframe to
9. ics 14 15V MF SIM Power supply typ for quiet electronics 15 24V MF gt SIM Power supply typ for maximum power The serial data signals RXD TXD CTS RTS follow standard RS 232 polarity conventions but are implemented as 0 5V HC logic levels The SIM900 Mainframe defaults all slots to 9600 baud but a wide range of baud rates is available under program control users should consult the SIM900 Mainframe documentation for further de tails The STATUS signal is terminated with a 100kQ pull up resistor in the Mainframe If a module has no microcontroller intelligence on board it can either drive STATUS with a gate or open collector to indicate a single bit message such as overload or can hard wire STATUS to GND as a simple presence detect function In any case the precise meaning of STATUS is SIM module specific Pulses on STATUS must be at least 10 us duration to guarantee detection by the Mainframe ASRS SIM9B1 amp SIM9B2 SIM Prototype Kits 2 3 Special Topics 2 3 Special Topics 2 3 1 Grounding 2 3 2 Power Special topics on grounding power supplies timebase and commu nications are discussed here Depending on the custom application users may find some parts of this section helpful The SIM interface dedicates 3 of the 15 pins to ground and within the SIM Mainframe all three of these pins are tied common to the Mainframe s ground When plugged into an inte
10. ied for up to 5 amps on a pin but good design should be well below that level Within the Mainframe each voltage is separately decoupled with a large ferrite bead and a 4 74F tantalum capacitor between any pair of slots these components will act as a pi filter to partially isolate SIM9B1 amp SIM9B2 SIM Prototype Kits SRS Circuit Guidelines 2 3 3 Timing reference conducted noise between modules The SRS reference design for modules calls for mirroring this bead capacitor network right at the DB 15 connector but this is application specific Unused supplies can be left unconnected within the module 5V This is the main digital supply to a module The mi crocontroller and associated logic are intended to be powered from here Note however this supply is independently regu lated from the SIM Mainframe internal VCC supply separate 3 terminal regulators If a module requires a small amount of 5V it might be good to generate it locally with a linear regulator down from 15 V The 5 V supply is created in the Mainframe with a 5 amp linear regulator these 5 amps must be shared among the assorted modules A good design will use less than 0 5 A of 4 5 V but if you need more it s available 5 V This supply is primarily for high speed applications ei ther to provide symmetric 5 V for fast amplifiers or as a Vgg supply for fast ECL logic This supply has a total of 3 amps capacity 15 V These
11. n place 111 iv General Information Symbols you may Find on SRS Products Ca Alternating current Caution risk of electric shock NUN Frame or chassis terminal NU Caution refer to accompanying documents Earth ground terminal a Do am ASRS SIM9B1 amp SIM9B2 SIM Prototype Kits General Information Specifications Interface Serial RS 232 through SIM interface Connectors DB 15 male SIM interface Weight 1 2 bs SIM9B1 1 4 bs SIM9B2 Dimensions 1 5 W x 3 6 H x 7 0 D SIM9BI 3 0 W x 3 6 H x 7 0 D SIM9B2 SIM9B1 amp SIM9B2 SIM Prototype Kits ASRS vi General Information ASRS SIM9B1 amp SIM9B2 SIM Prototype Kits 1 SIM Mechanical Interface In This Chapter There are two basic design options for a SIM prototype module single wide SIM9B1 or double wide SIM9B2 The exterior me chanical interfaces for both sizes are fixed and will only briefly be reviewed here Of greater interest to the SIM designer are the inter nal mechanical interfaces for mounting the main PCB locating the 15 pin D connector and so on 1 1 1 2 1 3 1 4 1 5 Exterior Specifications ls 1 2 Main PCB Soe nox cos de un d e me de in ee ies 1 3 12 1 Fixed component locations 1 3 122 Clearance 00000 1 3 Daughter Boards cia S 1 3 1 31 Sinele wide SIM9B1 1x eR 1 3 1 3 2 Double wide SIM9B2 1
12. nd DB 15 connector inside the module 1 2 1 Fixed component locations 1 2 2 Clearance 1 3 Daughter Boards 1 3 1 Single wide SIM9B1 Figure 1 2 gives coordinates for all key components on the main PCB The four mounting holes on the board are fixed relative to the module brackets and lie on a square with x 2 031 amp 4 656 and y 0 188 amp 3 008 The DB 15 connector must be located with pin 1 at r 0 391 y 0 398 and placed on the bottom side of the board to properly align with the module rear panel The clearance from the top side of the main PCB the component side to the interior wall of the module outer skin is nominally 0 252 This gives room for most surface mount components Bulky through hole components need to be mounted on the bottom side of the PCB the wire side Beneath each mounting hole is a steel tab from the module bracket see hashed blocks in Figure 1 2 This tab extends 0 156 inwards from the center of the mounting hole and 0 188 to either side of the center You must not place any components on the bottom side of the board where they will interfere with these tabs Most user prototype circuits will fit entirely on a single main PCB In cases where either complexity or performance requires additional circuit boards this section documents several mounting and inter face options The single wide module bracket has symmetric mounting tabs to hold two parallel PCB s the main PCB with
13. odule rear panel 10 2 SIM 1x bracket 7 00933 single wide top bottom bracket 11 2 SIM module cover 7 00932 12 4 Foot 0 00188 SR550foot Table 1 2 Items for double wide BOM Item Q ea Reference SRS P N Value comment 1 4 PCB mounting 0 00259 4 40x1 2PP not included 2 4 PCB mounting 0 00096 4 split wash not included 3 2 DB 15 mounting 0 00835 4 40x3 8PF Undercut 4 4 Front panel mounting 0 00148 4 40x1 8 PS slotted Phillips will NOT fit 5 4 Rear panel mounting 0 00515 4 40x1 8PP 6 8 Module cover mounting 0 00371 4 40x3 16PF Black undercut flathead Phillips 7 1 DB 15 connector 1 00367 DB 15 Male RA 0 318 footprint 8 1 Front panel SIM9B2 7 02085 Module front panel 9 1 Rear panel SIM9B2 7 02086 Module rear panel 10 1 SIM 2x top brkt 7 01380 double wide top bracket 11 1 SIM 2x btm brkt 7 01381 double wide bottom bracket 12 2 SIM module cover 7 00932 13 4 Foot 0 00188 SR550foot ASRS SIM9B1 amp SIM9B2 SIM Prototype Kits 2 Circuit Guidelines for SIM Designs While the function specific aspects of each SIM s circuitry will in general be unique all modules must conform to the same interface specification for compatibility with the SIM Mainframe In This Chapter 2 1 Connector Specification 2 2 Connector Pin out 2 3 Special Topics 2 3 1 Grounding 22A FOWE sa sso rassa cansa 2 3 8 Timing reference 2 3 4 Asynchronous communications Zoid Status coo de
14. ons SRS recommends minimizing this practice for custom mod ules Additional blank front and rear panels are available ASRS SIM9B1 amp SIM9B2 SIM Prototype Kits 1 4 Blank Panels Poo 1 uc om ss 2 les 3 o 1 i x gt E E E iE Y I i e gt o qe Y y Um X 060 3 384 002 156 L IQ 245 x 0680 y 4 5 136 THRU 3 192 005 R 03 4X v9 Lev 000 005 3 504 000 Figure 1 6 Single wide and double wide blank front panels SIM9B1 SIM9B2 SIM Prototype Kits SRS 1 10 SIM Mechanical Interface 1 5 Bill of Materials The complete list of components for assembling a SIM9B1 or SIM9B2 are tabulated below Table 1 1 Items for single wide BOM Item Q ea Reference SRS P N Value comment 1 4 PCB mounting 0 00187 4 40x1 4PP not included 2 4 PCB mounting 0 00096 4 split wash not included 3 2 DB 15 mounting 0 00835 440x3 8PF Undercut 4 4 Front panel mounting 0 00148 4 40x1 8 PS slotted Phillips will NOT fit 5 4 Rear panel mounting 0 00515 4 40x1 8PP 6 8 Module cover mounting 0 00371 4 40x3 16P Black undercut flathead Phillips 7 1 DB 15 connector 1 00367 DB 15 Male RA 0 318 footprint 8 1 Front panel SIM9B1 7 02082 Module front panel 9 1 Rear panel SIM9B1 7 02083 M
15. rnal slot in the mainframe only the contact resistance across the DB 15 connector will separate these grounds but when connected to a 15 pin cable the difference can be more significant The suggested uses for these pins are e PS RIN is intended to carry the bulk of the return current for a module At the least all the fast digital circuitry including any oscillator and microcontroller should return to this pin CHASSIS GND should be tied to the external chassis of the SIM module In most modules CHASSIS GND and PS RTN will be tied together in the module as well making this pin appear somewhat redundant In a high power or high speed module where PS RTN might bounce around a bit having the separate CHASSIS GND wire may help keep the module chassis from bouncing around too much There might also be a safety issue here but generally we ex pect SIM modules to be low voltage low power read safe instruments SIGNAL_GND is the clean ground Broadly there are two uses for it depending on the application First SIGNAL GND can be dedicated as an unburdened zero volts reference po tential for single ended signals A second and loosely related use is as an analog ground net for quiet circuitry The only distinction between these two uses is the DC ohmic drop in SIGNAL GND due to the returned analog current The SIM interface provides 5 distinct supply voltages to the mod ules 5V 15V and 24V The connectors are specif
16. s BG a e c 9 ooo ooo c 5 6 ooo 5 5 e e o ooo ooo ooo ooo 5 c 51 o e c o c 29 2 5 oo 2 2 Circuit Guidelines 2 1 Connector Specification 2 2 Connector Pin out All SIM modules have a 15 pin D connector as their primary inter face to the rest of the world This section describes that interface The connector is a 0 318 footprint right angle PCB mounted DSub 15 male Cinch part number DAKL 15PATI E SRS stock number 1 00367 For serial communication the SIM acts as Data Com munications Equipment DCE while the Mainframe acts as Data Terminal Equipment DTE towards the SIM Direction Pin Signal Src gt Dest Description 1 SIGNAL_GND MF SIM Reference only should carry no current 2 STATUS SIM MF Status service request GND asserted 5V idle 3 RTS MF SIM HW Handshake 5V talk GND stop 4 CTS SIM gt MF HW Handshake 5V talk GND stop 5 REF 10MHZ MF SIM 10 MHz reference clk complement of pin 12 6 5V MF SIM Power supply typ for fast electronics 7 15V MF SIM Power supply typ for quiet electronics 8 PS RTN MF SIM Power supply return GND 9 CHASSIS GND Chassis ground 10 TXD MF SIM Async data start bit 0 45V 1 GND 11 RXD SIM MF Async data start bit 0 45V 1 GND 12 REF_10MHz MF SIM 10 MHz reference clk complement of pin 5 13 5V MF SIM Power supply typ for fast electron
17. the rear panel DB 15 SIM9B1 amp SIM9B2 SIM Prototype Kits SRS SIM Mechanical Interface Sce 9 o 9 B N gt R Za o o Y 8 A Ge 6 gt gt Roo 881 0 veo o o 96 seoe d p majos E o Buyunou 0pXp 104 ajoy Jea y o O 96 O epis ulojoq 10j euuoo ejew gA WIS 404 3uud100j seoe d p epis woyoq sqe Bununoui gag 104 mo deey OWue eS8 C 800 0000 L6 0 961 Figure 1 2 Layout dimensions for main PCB SIM9B1 amp SIM9B2 SIM Prototype Kits SRS 13 Daughter Boards HO INOMHJ Yau 00 I S epis INO LLOS ay uo sjuauodulo9 JO WOOIPeaH sseuyotui god z90 0 Buruunsse sayou pZ 0 0 peyu si Od JO P S JO UO sjueuoduioo 104 WOOIPEL Y ejo L Quajeainba 10 3 LLVdS L VO HONIO se yons pJeoq eu jo epis 9sJ9 9J Y oj pajunow 10j9euuoo ajeu a Bue 3yBu gLe o e eq Pinoys g ga eur UO WO y pama SHT uo sjuNowW UMOYs se pjeog Spyeog JNOND WIS 104 Sejou je1euec O Hur ooooooon 0000000 O 1NOY3 9j EN wove SRS Figure 1 3 Configuration of main PCB in assembled module SIM9B1 amp SIM9B2 SIM Prototype Kits SIM Mechanical Interface on one side and a daughter board on the opposite side
Download Pdf Manuals
Related Search