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User Manual SP232 Serial Extended Function Module (for 1502B/C

1. readin outdat index crc 2 crc cre crc crc div 256 outdat index mod 256 end if leno in Pv V then writeln Variable Length CRC is crc writeln write Press Enter to return to Main Menu readin ch end I editcommand procedure acceptframe var index integer ch char begin port Padr 3 1 ftype getbyte set up default conditions opcode getbyte if odd opcode div 128 then leni V else leni P above are also conditions for ftypes of COMMAND QUERY and RESPONSE case ftype of STATUS begin ilen 0 leni F end SP232 User Manual 6 21 Parallel Protocol 6 22 TEST begin leni V leno V end end case ftype of if leni in Pv V then begin ilen getbyte data getbyte ilen 256 data mod 128 ilen if type TEST then olen ilen end cre 0 for index 1 to ilen do begin data getbyte indat index data if type TEST then outdat index data cre 2 crc cre crc crc div 256 data mod 256 end if leni in V v then begin data getbyte if data lt gt crc then writeln CRC should have been crc end writeln writeln frame type ftype writeln command opcode writeln for index 1 to ilen do writeln index data indat index if ftype TEST then writeln Test Frame writeln SP232 Us
2. Eight waveforms averaged before display or report 6 16 waveforms averaged before display or report 7 2 32 waveforms averaged before display or report 8 264 waveforms averaged before display or report 9 128 waveforms averaged before display or report arg Vertical Position SIL Value returned represents the counts of change since last reading of vertical position knob Positive indicates clockwise rotation negative indi cates counterclockwise rotation A value of zero indicates overflow or no change Value 255 indicates under flow or negative 1 Note The values for horizontal position vertical scale and vertical position change are read by the instrument when the front panel is enabled Therefore these values are not useful unless the front pan el is disabled in remote control 1503B C lt arg9 gt P ulsewidth 1 Byte The first byte is 0 2 nanosecond pulsewidth 1 10 nanosecond pulsewidth 2 100 nanosecond pulsewidth 3 1000 nanosecond pulsewidth 4 auto pulsewidth 1503B C lt arg10 gt Impedance Byte the value sent means 0 50 Ohm 1 75 Ohm 2 93 Ohm 3 125 Ohm SP232 User Manual 3 5 Command Set Waveform lt desc gt lt query gt lt opcode gt lt argl gt lt arg2 gt lt arg3 gt reply length lt argl gt argN gt crc Request for waveform data The binary waveform transmitted will be aver aged based upon current value of noise filter If averaging
3. auto pulsewidth mode selected 1503B C Impedance Byte the value sent means 0 50 Ohms 1 75 Ohms 2 93 Ohms 3 125 Ohms Commands lt desc gt lt cmd gt 10 lt cmd gt lt opcode gt lt argl gt 3 12 Remote Remote command enables or disables remote control of Instrument When Remote is OFF false the software settings and display are always consistent with the front panel settings Acquisitions will be enabled The instrument is back under manual control When Remote is ON true any manual change to the front panel settings will not change the software con trol settings or affect the display unless the Resume command has been received Acquisitions are disabled until either a Sweep Remote Off or Resume command is received 1502B C lt opcode gt 1503B C lt opcode gt lt argl gt 021h Remote On or Off Boolean TRUE Remote On FALSE Remote Off SP232 User Manual Command Set lt desc gt cmd lt opcode gt lt desc gt cmd lt opcode gt lt desc gt cmd lt opcode gt lt arg1 gt lt desc gt cmd cmd lt opcode gt lt argl gt lt arg2 gt Resume Permits manual operation of instrument Commands vertical scale vertical position horizontal position cursor buttons and instrument and acquisition setups programmed from remote control will still apply to the measurements until changed manually However
4. lt arg3 gt 3 14 Light Boolean True light on False light off 1502B C Ohms at Cursor Boolean True Ohms at Cursor on False Ohms at Cursor off Acquisition Setup Performs acquisition setup for max hold pulse and single sweep lt opcode gt lt argl gt lt arg3 gt 1502B C 02ch 1503B C 02c Max Hold Boolean True max hold on False max hold off Pulse Boolean True pulse disabled False pulse enabled Single Sweep Boolean True single sweep on False single sweep off Software Setup Set the 150XB C current software programmable settings 1502B C lt opcode gt lt argl gt lt arg2 gt lt arg8 gt 1503B C opcode arg1 arg2 arg10 025h Velocity of Propagation Hundredths Digit Byte 0 9 Velocity of Propagation Tenths Digit Byte 3 9 Distance per Division Byte 0 10 SP232 User Manual Command Set The following table shows the distance per division representations based on instrument setup Dist Div Argument English feet Metric meters 1502X 1503X 1502X 1503X 1502X 1503X 00 Software Setup continued Button Status Byte Button status where a non zero bit means mode is enabled and button box is on zero bit means mode disabled and button box is off bit 0 VIEW INPUT bit 1 VIEW DIFF bit2 VIEW STORE bit 3 STORE bits 4 7 Cleared Horizontal Position Ull Position of cursor on the display range is 0 250 Vertical Scale Ul1
5. s serial port to operate at 19 2 k baud with 1 start bit 1 stop bit no parity check and no time out This starts low level hardware handshake and leaves the SP232 ready for command or question from the computer Software handshake begins when you send an asterisk character through the computer to the SP232 and immediately read back a 1 byte directive from the SP232 The asterisk tells the SP232 that you want to start dialogue The directive byte sent back defines the kind of dialogue There are three directive bytes that the SP232 may send back to the computer reset directive decimal 2 send frame directive decimal 6 or accept frame directive decimal 7 Because the 150XB C and the SP232 have just been powered up the first directive byte sent back will be the reset directive which is ASCII character value 2 Your program should reset itself when it receives this directive because the 150XB C and SP232 have been reset usually by power up In this example your program is just starting There is no need to do anything except send another asterisk character which tells the SP232 that you are ready to continue In response the SP232 will send another directive byte The byte sent is the send frame directive which is ASCII character value 6 This byte tells your program that the SP232 is ready to accept either acommand or query In this example the waveform query and response is described The first byte sent to the SP232 i
6. 10 UI1 80 millirho UIL is an unsigned 1 byte integer Horizontal Scale 1502B C Metric Distance Ul4 x 0 001 meters English Distance Ul4 0 004 feet UM is an unsigned4 byte integer Horizontal Scale 1503B C Metric Distance Ul4 x 0 01 meters English Distance Ul4 0 04 feet UM is an unsigned4 byte integer Monitor Instructions desc query lt opcode gt reply lt argl gt lt arg2 gt lt arg3 gt lt arg4 gt The monitoring level of operation consists of monitoring instrument control settings and requesting data Instrument Setup Query instrument for current setups instrument ID 150XB C vertical scale in decibels or millirho horizontal scale in feet or meters light on or off bat tery or AC power lt opcode gt 00h 1502B C opcode arg1 arg2 arg3 arg4 arg5 arg6 1503B C lt opcode gt lt argl gt lt arg2 gt lt arg3 gt lt arg4 gt lt arg5 gt Instrument ID Byte 01 1502X 02 1503X Vertical Scale Byte 01 decibels 02 millirho Dependent on the instru ment setup replies will use as vertical scale UIl x 4 DB 10 UI1 80 millirho Horizontal Scale Byte 01 feet 02 2 meters Dependent on the instrument setup replies will use as horizontal scale 1502B C Metric Distance Ul4 0 001 meters English Distance Ul4 0 004 feet 1503B C Metric Distance Ul4 0 01 meters English Distance Ul4 0 04 f
7. Option Port interface Output only generated by 150XB C A0 least significant address bit Al address bit A2 address bit SP232 User Manual 6 3 Parallel Protocol 6 4 A3 address bit RD active low read signal IWR active low write signal ICS active low chip signal Above output lines are driven by a 74HC244 at the Option P ort NA acknowledge for IR signal below 11 Input only generated by Option Port device R active low service request line 13 R line is pulled up by a 10K to 5 volts Switch Power Supplies 16 switched 16 volts supply 23 amp 25 ret16 16 volt return lines 19 21 5 switched 5 volts supply 100 ma 17 ret5 5 volt return line 15 Tektronix Proprietary DO NOT USE 2 4 26 The general timing relationships of the control signals is diagrammed with reference to the 5 MHz instrument clock below although the clock is not ported clock ee JE a a a CS CC m mee is 200 ns Ari Tem WY 00000 9000 eM address HHA HHH write data HHKHHHHHH read data JHHHHHHHHHHHIZ IHHHHHHHHHHHE SP232 User Manual Parallel Protocol Where ___ is a low logic level and is a high logic level Where means don t care and means either high or low but steady state The diagrams show that data written to the Option Port by the instrument will be valid throughout the CS period and that data to be read by
8. 3 Command Set Dist Div Argument English feet Metric meters 1502X 1503X 1502X a 1502X 1503X 0 025 0 25 0 05 N O add NIE 5 ad NI FP O UT RO ol Hardware Setup continued lt arg4 gt Button Status Byte button status where a non zero bit means button is pressed zero means button is released bit 0 VIEW INPUT bit 1 VIEW DIFF bit 2 VIEW STORE bit3 STORE bits 4 7 Cleared lt arg5 gt Horizontal Position SIL Value returned represents the counts of change since last reading of cursor knob Positive indicates clockwise rotation negative indicates coun terclockwise rotation A value of zero indicates overflow or no change Value 255 indicates underflow or negative 1 lt arg6 gt Vertical Scale SIL Value returned represents counts of change since last reading of verti cal scale knob Positive indicates clockwise rotation negative indicates counterclockwise rotation A value of zero indicates overflow or no change Value of 255 indicates under flow or negative 1 3 4 SP232 User Manual Command Set Hardware Setup continued lt arg gt Noise Filter Byte Noise filter averaging value where value returned represents 0 Instrument in set ref mode no averaging 1 Instrument in set delta mode no averaging 2 Each waveform is reported or displayed with no averaging 3 Two waveforms averaged before display or report 4 Four waveforms averaged before display or report 5
9. 3 Miscellaneous Information 5 4 5 Compute a first offset correction Correction 64 waveform value x 128 6 Add offset correction to 8192 counts power up default for 150XB C 7 Set gain to 16 96 quarter dB counts and offset to corrected value with the software Setup command 8 Send Sweep command 9 Read where trace is with Waveform query 10 Compute new offset correction Correction 64 waveform value x 8 11 Add correct to offset value 12 Set gain to 128 168 quarter dB counts and offset to new value with software Setup command use 16 averages also 13 Send Sweep command 14 Read where trace is with Waveform query 15 Compute final offset correction Correction 64 waveform value 16 Add correction to last offset value to get zero offset value 17 Release instrument using Remote OFF command This procedure provides a zero offset value that is useful even at very high gain settings The conversion from quarter dB counts to voltage gain is voltage gain 10 quarter dB count 80 indicates exponentiation where The conversion from voltage gain to quarter dB counts is quarter dB counts 80 log voltage gain where log is the common or base 10 logarithm Finally though the zero offset value may vary slightly from instrument to instrument it is constant for every instrument and can be computed only once when a 150XB C computer system is first set up SP232 U
10. Basic demonstrate the SP232 to a knowledgeable programmer EFMGO BAS Program This program demonstrates the waveform query command SS GOSUB into Show user instructions GOSUB setup Setup variables display SP232 User Manual Miscellaneous Information WHILE x lt CLOSE 2 OPEN com1 1200 n 8 1 FOR RANDOM AS 2 PRINT 2 d INPUTS 1 2 IF d 2 r THEN PRINT Reset IF d a THEN GOSUB getwave IF d 25 THEN PRINT 2 q x INKEY IF x s THEN GOSUB suspend WEND CLOSE CLS PRINT PRINT PRINT Short Basic Program to show SP 232 serial interface at work PRINT PRINT PRINT Press the period key lt gt to end program PRINT PRINT PRINT Press lt s gt to stop at current waveform g to go again PRINT PRINT INPUT Press ENTER to begin x RETURN q contains the waveform query command r contains the reset directive string S contains the send frame directive string a contains the accept frame directive string SP232 User Manual 5 7 Miscellaneous Information 5 8 q CHR 32 CHR 130 CHR 0 CHR 1 CHR 251 r CHR 2 5 CHR 6 a CHR 7 SCREEN 2 WINDOW 0 0 251 255 CLS RETURN This routine draws waveform as it gets each point from 150XB C It would be just as easy to put the data into an array c INPUT 4 2 gets 4 bytes before first data point in frame GOSUB graticule PSET 0 2 A
11. Ohms 2 93 Ohms 3 125 Ohms Cursor Command to set the distance to cursor This command changes horizontal position of cursor A software setup query is recommended following this command to update current data A sweep must occur following this com mand to accurately reflect the cursor change lt opcode gt lt argl gt 027h Distance Units to Cursor Ull Distance units to cursor is sent Dependent on horizontal scale instru ment setup SP232 User Manual Command Set lt desc gt cmd lt opcode gt lt argl gt lt arg2 gt lt desc gt cmd opcode lt argl gt Put Byte Puts a byte of information at location specified opcode argl 02ah Address to Place Byte Ul2 Address low byte first Data UIT Data Delay Sets delay for transmit receive between instrument and user interface de fault in power up is 255 opcode argl 1502B C 02dh 1503B C 02bh Value of New Delay Resume IP UIL 1 255 SP232 User Manual 3 17 Command Set 3 18 SP232 User Manual NN AA 150XB C and SP232 Instruction Set Pr SE 150XB C and SP232 Instruction Sets Level 1 Monitor Instruction opcode frame type args Instrument Setup 0 Instrument Setup 1502X 00h 3 6 Instrument Setup 1503X 00h 3 5 instrument l Vertical Scale Horizontal Scale GRE Batey T baton Ohms at Cursor 1502X Acquisition Setup 0 Acquisition Setup 3 Max Hold Pulse Single Sweep H
12. Vertical scale which is value of instrument gain applied to incoming signal Value is dependent on instrument setup This value is the absolute vertical scale and does not reflect any vertical scale reference offset lt arg4 gt lt arg5 gt lt arg6 gt SP232 User Manual 3 15 Command Set lt arg gt lt arg8 gt lt arg9 gt lt arg10 gt lt desc gt lt cmd gt lt opcode gt lt argl gt 3 16 Software Setup continued Noise Filter Byte Noise filter averaging value where the value sent represents 0 No averaging instrument in Set Ref mode 1 No averaging instrument in Set Delta mode 2 Each waveform is reported or displayed with no averaging 3 Two waveforms averaged before display or report 4 Four waveforms averaged before display or report 5 Eight waveforms averaged before display or report 6 16 waveforms averaged before display or report 7 32 waveforms averaged before display or report 8 64 waveforms averaged before display or report 9 128 waveforms averaged before display or report Vertical Position Ul2 Vertical position of the trace ranges from 0 16383 with 8192 being approximately the center 1503B C Pulsewidth 1 Byte 0 2 nanosecond pulsewidth 1 10 nanosecond pulsewidth 2 100 nanosecond pulsewidth 3 1000 nanosecond pulsewidth 4 auto pulsewidth mode not selected 1503B C Impedance Byte the value sent means 0 50 Ohms 1 75
13. a CRC field to verify the integrity of the data sent Basic Frame Description Byte 1 Frame type in high nibble 1 command values 0 amp F are illegal 2 query values 6 E are reserved 3 response 4 status 5 test low nibble ignored Byte 2 Message byte containing specific command query status code test code FIO Demonstration Program The FIO demonstration program is an interactive way to test commands when in parallel communication mode The program is useful for testing individual commands and for learning how data frames used in the protocol are constructed SP232 User Manual 6 9 Parallel Protocol 6 10 When you invoke the FIO program the first prompt asks if you want to edit a command request service from the 150XB C or quit the FIO program Before requesting service enter the codes for a command using the Edit function Example m Run the FIO program and type e to edit a new command In this example you are asked for the first 10 data points from the current 150XB C waveform in 8 bit format for each data point Enter all numbers in decimal m Enter 130 for the opcode waveform query m Enter f for fixed length command m Enter 10 for response length m Enter 3 for command length m Enter 0 for the first command argument data byte m Enter 1 for the second command argument data byte m Enter 10 for the third command argument data byt
14. back to unassertted high main argc argv envp int argc char argv char envp outp PORT 3 0xc0 set 8255 to mode 2 wi outp PORT 3 1 set IR high unassertted while item menuchoice Q switch item case R requestservice break case E editcommana break case Q break default printf nlllegal Command break system cls outp PORT 3 1 set IR high unassertted again Pascal Version of Program output is data from computer to 150XB C input is data from 150XB C to the computer program fio const Maxbytes 550 Padr 768 DevID 129 6 18 SP232 User Manual Parallel Protocol COMMAND 16 command QUERY 32 query RESPONSE 48 response STATUS 64 Status TEST 80 Test type darray array 1 Maxbytes of integer var indat darray input data array outdat darray output data array directive integer I frame directive opcode integer I frame op code or command byte ftype integer frame type byte crc integer crc for variable length frames data integer general purpose data byte variable item char user menu choice leno char output frame length category leni char input frame length category olen integer output frame length ilen integer input frame length procedure putbyte byte integer begin port Padr b
15. below Option 01 1503B B022097 and below without Ethernet 06 Option 02 1503B B022097 and below with Ethernet 06 Option 03 SP232 Local Commands desc cmd opcode lt argl gt The following local commands configure the SP232 to accommodate host computer software In order to invoke the commands the SP232 must be installed in the 150XB C connected via the RS232 cable the host computer and 150XB C must be powered up The commands may be invoked whether the 150XB C is making measurements or not Local commands are designated with the Local frame type decimal 240 and are not relayed to the 150XB C They are executed by the SP232 only Set Baud Rate Permits setting SP 232 baud rate using host computer software lt opcode gt lt argl gt 01h Divide actual baud rate by 100 Byte 3 300 6 600 12 1200 24 2400 48 4800 96 9600 192 19200 SP232 User Manual 1 5 Operating Instructions Set Response Mode lt desc gt lt cmd gt lt opcode gt lt argl gt desc cmd lt opcode gt desc cmd lt opcode gt lt argl gt 1 6 Lets user determine whether the SP 232 will 1 wait for next request before sending 150XB C responses to com puter queries 2 send responses immediately as received by the SP 232 3 wait until computer releases RS232 C Request To Send RTS line before sending responses lt opcode gt lt argl gt 03h Sin
16. case 0x20 case 0x30 command getbyte leni command amp 128 V F break case 0x40 command getbyte ilen 0 SP232 User Manual Parallel Protocol leni P break case 0x50 command getbyte leni V leno V break default command getbyte leni command 4 128 V F break if leni V ilen getbyte data getbyte ilen 256 data amp Ox7F ilen if ftype 0x50 olen leni crc 0 for index 1 index lt ilen index data getbyte in index data if ftype 0x50 out index data crc 2 crc crc crc crc 256 data amp 255 if leni V data getbyte if data crc printf s d n CRC should have been CIC SP232 User Manual 6 15 Parallel Protocol 6 16 printf n 96s din frame type ftype printf s d n command command for index 1 index lt ilen index printf d 96s din index data in index if ftype 0x50 printf nTest Frame n printf nPress space bar to return to Main Menu getch sendframe putbyte ftype putbyte command ifleno V cre 0 zero out crc accumulator data olen amp 255 putbyte data data olen 256 putbyte data for index 1 index lt olen index data out in
17. is suitable for most computer systems If necessary the baud rate may be changed by using host computer software which is the preferred method To change the baud rate using software see the Set Baud Rate instruction under SP232 Local Command Set The baud rate may also be changed by disassembling the SP232 and repositioning jumpers on its circuit board This method is reserved for qualified service personnel because of the potential for mistakes and damage to instrument electronics SP232 signal levels conform to EIS RS232 C specs as follows AA pin 1 protective or earth ground AB pin 7 signal ground BA pin 2 TXD asynchronous data transmit DTE to DCE BB pin 3 RXD asynchronous data received DTE from DCE CA pin 4 RTS request to send signal originated by DTE CB pin 5 CTS clear to send signal originated by DCE CE pin 6 DSR data set ready The SP232 serves as a data buffer that buffers and holds only the last computer frame and the last 150XB C response The SP232 will operate under the 150XB C battery power but battery operating time will be reduced SP232 User Manual 1 3 Operating Instructions SP232 Set Up 1 With the 150XB C turned off plug the SP232 into the Option Port on the front panel Turn the locking latch clockwise to lock the SP232 in place 2 Connect the SP232 to the serial port of the host computer using a standard RS232 cable A female RS232 connector is located on
18. 0 PRINT Low frame count received HEX D 680 GOSUB 1100 R 256 D AND amp H7F R 690 PRINT High frame count received HEX D 700Q 0 710 FORI 2 1 TOR 720 GOSUB 1100 P D 730Q 2 Q Q Q Q AND 256 256 D AND 255 740 PRINT I Data received HEX D 750 NEXT I 760 IF C AND 128 0 THEN GOTO 800 not variable length 770 GOSUB 1100 Q1 D SP232 User Manual Parallel Protocol 780 PRINT CRC byte received HEX D 790 IF Q1 lt gt Q THEN BEEP PRINT CRC should have been HEX Q 800 PRINT PRINT Press ENTER to return to Main Menu INPUT A 810 RETURN 820 send a frame directive 830 PRINT Directive to Send a Frame 840 D F GOSUB 1060 850 PRINT Wrote frame type HEX D 860 D C GOSUB 1060 870 PRINT Wrote command HEX D 880 IF Z O THEN GOTO 940 not variable length command 890 Q 0 zero out crc accumulator 900 D LAND 255 GOSUB 1060 910 PRINT Wrote low frame length HEX D 920 D INT L 256 GOSUB 1060 930 PRINT Wrote high frame length HEX D 940 FOR I 1 TOL 950 D V I GOSUB 1060 9600 2 Q Q Q Q AND 256 256 D AND 255 970 PRINT I Wrote data byte HEX D 980 NEXT 990 IF Z O THEN GOTO 1020 not variable length command 1000 D Q GOSUB 1060 1010 PRINT Wrote CRC byte HEX D 1020 OUT 8 H303 1 1030 PRINT Put IR line back to high unass
19. 150XB C has now accepted a request for data To request data m Enter r to request service The EFMCMD program will show you frametype 6 accepted and the 15 bytes of data sent in response to your query SP232 User Manual 5 5 Miscellaneous Information The waveform response is a variable length data frame containing the number of data bytes terminated by a 1 byte CRC The first byte is 48 which is the response frametype byte The second byte is 130 which is the waveform query opcode being responded to m The next two bytes are 10 and O which is the number of data bytes in a 16 bit integer The least significant byte of the integer 1s sent first These bytes are not present in fixed length data frames m The next ten bytes are the actual waveform data points in 8 bit integers These will change if you move the vertical position of the waveform and repeat the query m The last byte is the cyclical redundancy check CRC byte used to validate the data This byte is not present in fixed length data frames Commands and Remote Operation When sending a command to the 150XB C use directive value 16 and you will not have to request service a second time Once you start sending commands to change 150XB C settings you will automatically put the 150XB C into remote operating mode This means that you must request a new data sweep to see the effects of your changes Sample Programs 5 6 The following programs written in
20. 2 All other directive values are reserved SP232 User Manual 6 5 Parallel Protocol 6 6 Once the directive byte has been written to the Option Port the Option Port device has 10 milliseconds to respond to the directive given by the instrument If the directive is to accept a frame of information the device must release the IR line and prepare to accept successive bytes on successive IA strobes Pulling the IR line low during a frame transfer to the device from the instrument will cause an error and abort the transmission The instrument will write an accept last frame directive at the next service opportunity Accept Frame Sequence IR d mo ee H ilo ee pp m data HH AA RD canoe poser m write byte 2 device reads data instrument strobes LA instrument writes data byte I device releases IR instrument strobes directive byte directive byte written by instrument instrument reads ID byte service requested by device data at the Option Port interface Estimated Timing Intervals a b indefinite b c 1 x lt 50 microseconds c d 1 x lt 50 microseconds d e x lt 10 milliseconds e f 1 x lt 500 microseconds f g x lt 50 microseconds g h x 50 microseconds h i 100 x 250 microseconds f i 100 lt x lt 300 microseconds typically 200 SP232 User Manual Parallel Protocol If the directive is to send a fra
21. 50 lt x lt 200 microseconds h k 150 lt x lt 200 microseconds If the directive is to wait until signaled the device should release the IR line at once and not assert it again until it sees another IA strobe When the strobe is seen the device may request attention by asserting the IR signal again If the directive is to reset the device should release the IR line at once and not assert it again until it has cleared all errors partial frames and at least 20 milliseconds has passed for the instrument to also get into a reset state Software Protocol 6 8 The software protocol is based on a master slave relationship that must exist between the instrument and the Option Port device Since the actual data acquisition routines in the instrument cannot be interrupted the instrument will provide service to the Option Port on a polled basis The polling frequency will be determined by how much acquisition and display time is taken by the commands accepted for execution through the Option Port in most circum stances There are a number of levels of remote operation of the instrument possible through the Option Port The first level is simply monitoring the instrument control settings and requesting data from time to time In this mode the instrument operates normally always acquiring except for the small pieces of time required to respond to queries from the Option Port device This mode is useful for manually setting the acquisitio
22. Cursor Ul4 Distance to the cursor is returned Response is dependent on horizon tal scale instrument setup Point 1 lt desc gt Query for distance to first point in the sweep 251 points lt query gt lt opcode gt lt opcode gt 04h reply lt opcode gt lt argl gt lt argl gt Distance to First Data Sample Ul4 Response is dependent on horizontal scale instrument setup Diagnostic lt desc gt Query returns status of instrument diagnostics which is performed when the diagnostic query request is received lt query gt lt opcode gt lt opcode gt 05h reply lt opcode gt lt argl gt lt argl gt Diagnostic Status Byte Status is returned when a zero bit means self test passed a non zero bit means self test failed bit 0 ROMO self test bit 1 ROMI self test not currently implemented bit 2 RAM self test bit 3 NVRAM self test not currently implemented bit 4 Display RAM self test not currently implemented bits 5 7 Cleared SP232 User Manual 3 7 Command Set Remote desc query lt opcode gt reply lt argl gt Query for remote status of instrument lt opcode gt 06h lt opcode gt lt argl gt Remote State Boolean TRUE Remote on FALSE Remote off Display desc query lt opcode gt reply lt argl gt Query for front panel display status lt opcode gt 07h lt opcode gt lt argl gt Display Status Boolean TRUE Display disable
23. HEN GOSUB incommand IF o r THEN GOSUB request IF o 2 s THEN GOSUB setserial IF o THEN PRINT PRINT Using sp GOSUB prompt WEND CLOSE CLS END PRINT PRINT Enter your choice one letter amp press enter key PRINT INPUT e nter command r equest service s et serial port q uit program 0 RETURN t is used to temporarily store command string while baud command in q CLS PRINT PRINT Current SetUp is sp PRINT INPUT Enter baudrate br INPUT Enter stopbits sb t q q 2 CHR 240 CHR 1 CHRS VAL br 100 ld a WHILE ld lt gt s GOSUB request WEND q t Sp coml br n 8 sb PRINT PRINT New SetUp is sp PRINT RETURN SP232 User Manual Miscellaneous Information PRINT PRINT Frametypes are command 16 query 32 local 240 PRINT INPUT Enter frametype c q CHR c PRINT PRINT Command OpCodes are summarized in SP232 the manual PRINT INPUT Command 0pCode c q q CHR c PRINT PRINT Command length is of bytes needed for command arguments PRINT INPUT Command Length cl FORi 1T0 cl PRINT command argument byte i INPUT c q q CHR c NEXT i RETURN CLOSE 2 OPEN sp FOR RANDOM AS 2 PRINT 2 d INPUT 1 2 PRINT Directive from 150XB C is ASC d ld d IF d r THEN GOSUB init IF d s THEN GOSUB send IF d a THEN GOSUB a
24. Offset Volts and Gain dB A D Counts Pixels Change P qw Pr p us m p ms m 1 1 1 1 64 4 28 56 15 70 512 54 dB 2 1029 60 25 dB 5 7 1540 63 75 dB Gain has been rounded to the nearest quarter dB and pixels to the nearest integer value At gains greater than 128 42 dB each count of offset will move more than one pixel on the display In normal operation the amount of screen movement is held proportionate to the amount of control knob rotation with a scaling algorithm Even so 12 pixel jumps at very high gain is noticeable The following equality expresses the relationship between gain offset and change in position on the LCD in pixels gain_volts delta_offset delta_pixels 128 where delta_pixels pixels 64 waveform query w 8 bit values delta_offset offset zero_offset gain_volts actual voltage gain not in dB units Note Delta refers to differences from system zero points not changes made by the operator or programmer When the goal is to keep the waveform at the same location on the LCD the only requisite is to keep the gain delta_offset product constant In order to do this find the system zero_offset value A method for finding the system zero_offset value at power up is 1 Power up instrument 2 Set pulse to OFF with Acquisition Setup command 3 Send Sweep command 4 Read where trace is with Waveform query 8 bit values from current SP232 User Manual 5
25. PUT bit 1 VIEW DIFF bit2 VIEW STORE bit 3 STORE bits 4 7 Cleared Horizontal Position Ull Position of cursor on the display Range is 0 250 Vertical Scale Ul1 Vertical scale which is value of instrument gain applied to the incoming signal Value is dependent on instrument setup This value is the absolute vertical scale and does not reflect any vertical scale reference offset Noise Filter Byte Noise filter averaging value where value returned represents 2 Each waveform is reported or displayed with no averaging 3 Two waveforms averaged before display or report 4 Four waveforms averaged before display or report 5 Eight waveforms averaged before display or report 6 16 waveforms averaged before display or report 7 32 waveforms averaged before display or report 8 64 waveforms averaged before display or report 9 128 waveforms averaged before display or report Vertical Position Ul2 Vertical position of trace ranges from 0 16383 with 8192 being approximately the center The 150XB C s initial vertical position after power up is set so that the top of the outgoing step is at center screen SP232 User Manual 3 11 Command Set lt arg9 gt lt arg10 gt Software Setup continued 1503B C Pulsewidth 1 Byte bits 0 1 0 2 nanosecond pulsewidth 1 10 nanosecond pulsewidth 2 100 nanosecond pulsewidth 3 1000 nanosecond pulsewidth bit 2 0 auto pulsewidth mode not selected 1
26. SC INPUTS 1 2 draw first point FOR 2T0 251 LINE 1 2 ASC INPUT 1 2 draw to next point NEXT 1 This routine does not check CRC to make sure data is all valid c INPUT 1 2 this gets the CRC byte at the end of the frame RETURN BEEP x INKEY CLS LINE 0 0 251 255 1 B draw border FOR x 0T0 251 STEP 251 10 draw grid marks FOR y 0 TO 255 STEP 255 40 SP232 User Manual Miscellaneous Information PSET x y NEXT y NEXT x FOR x 0 TO 251 STEP 251 50 FOR y 20 TO 255 STEP 255 8 PSET x y NEXT y NEXT x RETURN AS EFMCMD Program This program interactively teaches and tests 150XB C Serial Protocol amp Commands setup sb 1 default to one stopbits br 1200 default to 1200 baud sp coml br n 8 sb r CHR 2 s CHR 6 a CHR 7 q CHR 32 CHR 0 Instrument Setup Query for default CLS PRINT PRINT PRINT This is a short interactive Basic program to letthe user PRINT experiment with the 150XB C computer command set PRINT PRINT Allnumbers must be entered in decimal letters in lower PRINT case PRINT PRINT See the software protocol description and command set sections PRINT of the SP232 manual for explanations of data formats PRINT specific command syntax PRINT SP232 User Manual 5 9 Miscellaneous Information 5 10 GOSUB prompt WHILE o lt gt q CLS IF o e T
27. SP232 allows the 150XB C to be controlled by an external host computer or other DTE Data Terminal Equipment device that uses RS232 C serial protocol The SP232 acts as a DCE Data Commu nications Equipment device The SP232 module is powered by the 150XB C and plugs into the Option Port on the front panel of the 150XB C This receptacle normally houses the Chart Recorder The SP232 then connects to the serial port on the host computer After the 150XB C and computer are powered up use the codes described in this manual to write a program to control the 150XB C through the computer NOTE See Options for ROM version and upgrade information Applications There are many applications where using the SP232 can result in productivity benefits Some of these areas are automated testing in a cable production facility remote testing and measurement in a communication network environment and automated calculation and data reduction SP232 User Manual 1 1 Operating Instructions In a cable production facility cable testing can be completely automated The PC can be programmed to set up the 150XB C prompt the operator to attach a cable invoke the measurement and transfer the resulting data to the PC The PC then compares the data to a known standard and gives the operator a go no go decision In a communication network environment the 150XB C and SP232 can be connected remotely via modem to a controller Periodic measurement
28. Setup 1 With the 150XB C turned off plug the parallel interface cable into the connector at the back of the Option Port There is no module installed in the Option Port SP232 User Manual 6 1 Parallel Protocol 2 Connect the interface cable to the host computer 3 Power up the 150XB C Power up the host computer Use the host computer as the controlling device Protocol commands instructions etc are the same as described for SP232 serial communication mode except where noted in this chapter Parallel Interface Cable Pinouts These pinouts are used for manufacturing a parallel interface cable that connects between the 150XB C Option Port connector and a host computer that contains a parallel I O card Signal data0 datal data2 data3 data4 data5 data6 data7 addr0 addr1 addr2 addr3 RD 150XB C COMPUTER Pin Pin Signal 7 7 o EE 5 am 31 3 as m s e m m es data6 3 1 3 E TJ AA PCA or STBA SP232 User Manual Parallel Protocol Signal NR 5 volts 5 return 16 volts 16 return Analog retum MRIG Hardware Protocol The available hardware signals are Input Output bi directional Connector Pin DO least significant data bit 3 D1 data bit 1 D2 data bit 24 D3 data bit 22 D4 data bit 20 D5 data bit 18 D6 data bit 16 D7 most significant data bit 14 Data lines are driven by a 74HC245 and are pulled down by 10K at the
29. TDR and SP232 Instruction Sets Level MOPDIOE sapiente t p Sa WO 4201 4 1 Level Remote as ratio 4 3 Miscellaneous Information 150XB C MTDR Software Version Via Computer 5 1 Gain Offset Via Computer sus Sos cc er 5 2 EFMCMD Demonstration Program 5 5 Commands and Remote Operation 5 6 Sample Programs se setimi ee A reife 5 6 EFMGO BAS Program lesbi vu 4 24264 rare REOR e 5 6 BPEMCMD Prottam Fer A ses 5 9 Parallel Protocol OVERVIEW sorg en SAA Ped del pen 6 1 See ST 6 1 Parallel Interface Cable Pinouts 6 2 Hardware Protocol betis rennt 6 3 Master Slave Handshake_ 6 5 Accept Frame Sequence 2s 27212 20 s4 x64 60400439542 ees 6 6 Estimated Timing Intervals au asian are 6 6 Send Frame Sequence 3 ee 6 7 Estimated Timing Intervals 6 7 Software Protocol 25 6121440044 eot sa LE eo ato dU net 6 8 Basic Frame Description ust ss 6 9 FIO Demonstration Program cose 346 30 G2150 6 ups 6 9 Commands and Remote Operation 6 11 Sample Program das EII A A 6 11 C Version of Program cis a 2s pae ai 6 12 Pascal Version of Program_ 6 18 BASIC Version of Program asus ara 6 25 ii SP232 User Manual AE SAA General Safety Summary Operator Safety Summary Power Source The SP232 module is designed to operate from power supplied by the host instrument Groundin
30. User Manual Tektronix SP232 Serial Extended Function Module for 1502B C 1503B C MTDRs 071 0467 00 First Printing October 1998 Copyright O Tektronix Inc 1998 All rights reserved Tektronix products are covered by U S and foreign patents issued and pending Information in this publication supercedes that in all previously published material Specifications and price change privileges reserved Printed in the U S A Tektronix Inc P O Box 1000 Wilsonville OR 97070 1000 TEKTRONIX TEK and SP232 are registered trademarks of Tektronix Inc WARRANTY Tektronix warrants that this product will be free from defects in materials and workmanship for a period of one 1 year from the date of shipment If any such product proves defective during this warranty period Tektronix at its option either will repair the defective product without charge for parts and labor or will provide a replacement in exchange for the defective product In order to obtain service under this warranty Customer must notify Tektronix of the defect before the expiration of the warranty period and make suitable arrangements for the performance of service Customer shall be responsible for packaging and shipping the defective product to the service center designated by Tektronix with shipping charges prepaid Tektronix shall pay forthe return ofthe product to Customer if the shipment is to a location within the country in which the Tektronix s
31. a send frame directive which allows the computer to send the user defined command frame The accept frame and send frame routines follow the protocol descriptions exactly and should be easy to trace C Version of Program define MAXBYTES 550 define PORT 0x300 define DEVICE 0x81 include lt stdio h gt include lt ctype h gt include lt stdlib h gt include lt conio h gt afew global variables output is data from computer to 150XB C input is data from 150XB C to the computer int in MAXBYTES input data array int out MAXBYTES output data array int type type of service requested int directive frame directive int command frame op code or command byte int ftype frame type byte int leno output frame length category int leni input frame length category int crc crc for variable length frames int data general purpose data byte variable int item user menu choice int ch general purpose character int olen output frame length int ilen input frame length int index loop index putbyte byte int byte SP232 User Manual Parallel Protocol outp PORT byte byte inp PORT 2 while byte 4 128 0 byte inp PORT 2 getbyte int byte byte inp PORT byte inp PORT 2 while byte 4 32 0 byte inp PORT 2 byte inp PORT
32. ardware Setup PT Hardware Setup 1502X 01h 3 8 Hardware Setup 1503X 10 Vp hundredths TCT Vp tents px OE Dist my Button bit 0 1 2 3 es Horizontal position 1 byte verse Tbe Fer AAA Vertical position bye Pulse Width 1503X 0 4 Ss Impedance SX SP232 User Manual 4 1 Instruction Sets Instruction opcode frame type args Waveform 082h 130 3 Data Type 0 current screen 8 bit 1 stored screen 8 bit 2 diff screen 8 bit 4 current acq 13 bit 5 stored acq 13 bit Sang dape Jan Num data pts 1 251 Wavefom In engin mws BEE data pt lt n gt 1 byte pt screen or 2 bytes me Cursor m 2 p Cursor TU byes Pont wooo p p Font 7 Diagnostik Diagnostic RonD BED Fom BET Rambi ES EME Remote 0 Remote 1 state 4 2 SP232 User Manual Instruction Sets Instruction opcode frame type args Display Display state Get Byte address 2 bytes low high UE mm BP value byte at address he Acq 0 Acq 1 state Delay 0 Delay 1 value Level 2 Remote Instruction opcode frame type args SW Setup Query 020h 32 0 SW Setup Query 1502X 020h 3 8 9 bytes SW Setup Query 1503X 020h 3 10 11 bytes Vp hundredths 0 9 Vp tenths 3 9 ha Dist div 1502X 0 10 Dist div 1503X 0 11 Button bit 0 1 2 3 cursor pos 0 250 Vertical scale 1 byte 1 count per 25 db Fifer W a pt SP232 User Manual 4 3 Instruction Sets Instru
33. ccept IF d lt gt ok THEN PRINT Illegal Directive Received RETURN PRINT 2 q PRINT PRINT Command Sent FOR i 1TO LEN q PRINT ASC MID q i 1 T NEXT i PRINT d z ok RETURN SP232 User Manual 5 11 Miscellaneous Information 5 12 PRINT INPUT ENTER gt for response d PRINT d INPUT LOC 2 2 PRINT Frametype ASC MID d 1 1 PRINT OpCode ASC MID d 2 1 FOR i 23TO LEN d PRINT Byte 2 ASC MID d 1 NEXT i d ok PRINT RETURN PRINT PRINT Received Reset Directive d ok BEEP RETURN SP232 User Manual Parallel Protocol NY A Parallel Protocol Overview This chapter describes hardware and software protocol information necessary for parallel communication between the 150XB C and host computer without using an SP232 module All commands and instructions remain the same as when using an SP232 module Note In order to use the 150XB C in parallel communication mode you must have a parallel interface cable that attaches between the 150XB C Option Port connector and the host computer This cable is not furnished You have to supply your own Please refer to the next page for a list of pinouts necessary to manufacture the interface cable Also the host computer must have a parallel I O card Anasco 41 404 for example installed before parallel communication is possible Setup Parallel Interface Cable
34. ction Vertical pos Pulse width 1503X Impedance 1503X Remote Command state Resume Command Sweep Command Display Command state Instru Setup Cmd 1502X Instru Setup Cmd 1503X Vertical Scale Horizontal Scale Light Ohms at Cursor 1502X Acquisition Setup Cmd Max Hold Pulse Single Sweep SW Setup Cmd 1502X SW Setup Cmd 1503X Vp hundredths Vp tenths Dist div Button cursor pos Vertical scale Filter 4 4 opcode 0 16383 bit 0 1 pw bit 2 auto pw ci 3 E frame type args 021h 33 T on 022h 34 023h 35 zul 02bh 43 i 43 ff as T on F 02ch 44 T on 025h e 1 8 9 bytes on forores mm B p cm Ban D0123 mm 030 _ ye Teoumper sh C SP232 User Manual Instruction Sets Instruction opcode frame type args Vertical pos 0 16383 Pulse width 1503X 0 4 Impedance 1503X 0 3 Cursor Command 027h 39 1 4 byte Put Byte Command address value Delay Command 1502X 02dh 45 Delay Command 1503X 02bh 45 value 135 EAS SP232 User Manual 45 Instruction Sets 4 6 SP232 User Manual ma Miscellaneous Information Y A Miscellaneous Information This section contains miscellaneous software information and sample programs for serial communications using the SP232 module 150XB C Software Version via Computer To determine the software revision level of the 150XB C when under cont
35. d FALSE Display enabled Acquisition desc query lt opcode gt reply lt argl gt Query for acquisition status lt opcode gt 0ah lt opcode gt lt argl gt Acquisition Status Boolean TRUE Acquisition disabled FALSE Acquisition enabled Get Byte desc query lt opcode gt lt argl gt 3 8 Query for contents of address lt opcode gt lt argl gt 08h Address to retum byte contents Ul2 2 byte address low byte first SP232 User Manual Command Set Get Byte continued reply lt opcode gt lt argl gt lt argl gt Contents of Address UIL byte Delay desc Query for delay value query lt opcode gt lt opcode gt Obh lt reply gt lt opcode gt lt argl gt lt argl gt Delay Value U 1 1 byte value 150XB C and SP232 Remote Instructions The remote level of operation takes remote control of instrument by Configuring instrument setup and front panel settings Enabling disabling access to front panel controls though the front panel controls can still be monitored using the hardware setup query from the monitor mode command set Enabling disabling acquisitions Enabling disabling display refresh Any remote level commands will automatically turn remote control on whether or not the Remote command has been sent For most commands remote control ON implies that the front panel and acquisitions are disabled The exceptions are Sweep an
36. d Resume commands see their descriptions for further detail When receiving remote level commands if instrument is not currently under remote control the current instrument setup front panel settings and stored waveform data are stored When remote control is turned off this data will be stored SP232 User Manual 3 9 Command Set Queries Software Setup desc Query the instrument for current software programmable settings These settings may or may not reflect the front panel controls query opcode lt opcode gt 020h reply 1502B C lt opcode gt lt arg1 gt lt arg2 gt lt arg8 gt 1503B C lt opcode gt lt argl gt lt arg2 gt lt arg10 gt lt argl gt Velocity of Propagation Hundredths Digit Byte 0 lt arg2 gt Velocity of Propagation Tenths Digit Byte 3 9 lt arg3 gt Distance per Division Byte 0 10 The following table shows the distance per division representations based on instrument setup Dist Div Argument English feet Metric meters 1502X 1503X 1502X 1502X 1503X 0 025 0 25 0 05 2 oj e Of RO ii 5 El CH no UT NJ al o 3 10 SP232 User Manual Command Set lt arg4 gt lt arg5 gt lt arg6 gt lt arg7 gt lt arg8 gt Software Setup continued Button Status Byte Button status where a non zero bit means mode is enabled and button box is on zero means mode is disabled and button box is off bit 0 VIEW IN
37. data Rx Request to Send RTS Clear to Send CTS Data Set Ready DSR and signal and chassis grounds The SP232 functions as a DCE device that asserts DSR and establishes communication with the 150XB C upon power up After asserting DSR the SP232 waits for the host computer or other DTE device to assert the RTS signal line Assertion means that the host computer wants to send data to the SP232 In response to RTS asserted the SP232 asserts the CTS signal line The host computer never sends data to the SP232 until CTS is asserted and stops sending as soon as CTS is no longer being asserted When the host computer senses the CTS signal it begins sending data to the SP232 The SP232 looks for an asterisk character as the ID byte at the beginning of each data frame from the host computer and ignores all other characters until an asterisk has been received When the SP232 detects an asterisk character it stops asserting CTS and sends a 1 byte directive back to the host computer The following example explains the possible values and meanings for the directive bytes SP232 User Manual 2 1 Serial Protocol Protocol Example Serial software protocol is most easily understood by looking at an example exchange of data between the host computer and SP232 In this example the SP232 is installed in the 150XB C and the 150XB C and host computer have just been powered up Dialogue starts when you configure the computer
38. dex putbyte data crc 2 org crc crc crc 256 data 4 255 if leno V putbyte crc outp PORT 3 1 printf n 96s d n frame type ftype printf s d n command command for index 1 index lt olen index printf d 96s din index data out index if ftype 0x50 printf nTest Frame n SP232 User Manual Parallel Protocol printf nPress space bar to return to Main Menu getch requestservice system cls printf Enter C ommand Q uery R esponse S tatus or Test scanf 961s 8 type type toupper type switch type case C ftype 0x10 break command case Q ftype 0x20 break query case R ftype 0x30 break response case S ftype 0x40 break Status case T ftype 0x50 break Test default ftype 0x10 printf nDefaulting to command break printf nRequest Service n outp PORT DEVICE outp PORT 3 0 putbyte DEVICE directive getbyte switch directive case 7 case 5 acceptframe break case 6 case 4 sendframe break case 2 resetit break default printf s d Illegal Directive directive printf nPress space bar to return to Main Menu SP232 User Manual 6 17 Parallel Protocol getch break outp PORT 3 1 put IR line
39. e You are now returned to the Main Menu Send the just entered commands to the 150XB C m Enter r to request 150XB C service m Enter q to query because you are asking the 150XB C for data The FIO program will send frametype opcode and data Or print a message stating that a reset directive was received from the 150XB C The 150XB C always sends a reset directive the first time it responds to a service request after power up If the 150XB C responded with a rest directive request service again and the frame information should be sent The 150XB C has now accepted request for data To request the data W Enter r to request service m Enter r for a response from the 150XB C The FIO program will show you frametype accepted and the 10 bytes of data sent in response to your query SP232 User Manual Parallel Protocol Commands and Remote Operation When sending a command to the 150XB C use the c option in the Request Service menu and you will not have to request service a second time Once you start sending commands to change 150XB C settings you will automatically put the 150XB C into remote operating mode This means that you must request a new data sweep to see the effects of your changes Sample Program The following demonstration program written in C Pascal and Basic provides a pattern for developing software for 150XB C parallel protocol It may also help programmers to learn parts o
40. eet Light Boolean True light on False light off SP232 User Manual Command Set lt arg5 gt lt arg6 gt desc query opcode reply lt argl gt lt arg2 gt lt arg3 gt lt desc gt lt query gt lt opcode gt lt reply gt reply lt argl gt lt arg2 gt lt arg3 gt Instrument Setup continued Battery Byte 00 AC 01 battery 02 battery low 1502B C only Ohms at Cursor Boolean True ohms at cursor on False ohms at cursor off Acquisition Setup Query instrument for current acquisition setup max hold pulse and single sweep lt opcode gt 09h lt opcode gt lt argl gt lt arg2 gt lt arg3 gt Max Hold Boolean True max hold on False max hold off Pulse Boolean True pulse disabled False pulse enabled Single Sweep Boolean True single sweep on False single sweep off Hardware Setup Query instrument for current hardware settings This query will read the hardware latches but will not change the software settings lt opcode gt 01h 1502B C lt opcode gt lt argl gt lt arg2 gt lt arg8 gt 1503B C lt opcode gt lt argl gt lt arg2 gt lt arg10 gt Velocity of Propagation Hundredths Digit Byte 0 9 Velocity of Propagation Tenths Digit Byte 3 9 Distance Per Division Byte 0 10 The following table shows distance per division representations based on instrument setup SP232 User Manual 3
41. elay before it requests response to the waveform query The next step is to tell the SP232 that you want a response to your query This is done by sending another asterisk character to the SP232 through your computer s serial port Once again the SP232 will send back a directive byte This time the byte will be ASCII character value 7 which is the accept frame directive This means that the SP232 has a frame of data to send to your program In this example your program should immediately read 15 bytes from the computer These bytes comprise a frame of data from the 150XB C which consists of a response frame byte ASCII 48 the waveform query opcode ASCII 130 two frame length bytes ASCII 130 two frame length bytes ASCII 20 ten data points whose ASCII values are the first ten points of the 150XB C SP232 User Manual 2 3 Serial Protocol waveform and a single CRC Cyclical Redundancy Check byte whose ASCII value is derived from the data bytes and can be used to make sure that the data was not corrupted in transmission Your program then sends an asterisk character to tell the SP232 that you want to communicate The SP232 then sent back a directive byte which told your program the kind of communication wanted by the SP232 The example is not easy to understand immediately because it illustrates the most complex dialogue in the command set Sections 3 through 7 explain in detail how data frames are constructed and list a
42. ent 340 GOSUB 1100 350 PRINT directive byte read HEX D 360 IF D 7 OR D 5 THEN GOTO 570 accept frame 370 IF D 6 OR D 4 THEN GOTO 820 send frame 390 IF D 2 2 THEN GOTO 1170 reset directive 400 BEEP PRINT PRINT illegal directive 410 PRINT Enter Directive to use INPUT D PRINT GOTO 350 420 RETURN should never get to here SP232 User Manual 6 25 Parallel Protocol 6 26 430 Command Editing Routines 440 CLS PRINT PRINT Command Definition Section PRINT 450 PRINT Enter Op Code INPUT C 460 PRINT Enter 0 for fixed or 1 for variable length command INPUT Z 470 PRINT Enter Response length INPUT R 480 PRINT Enter Command frame length INPUTL Q 0 490 FORI 1 TOL 500 PRINT Enter data byte l INPUT V I 510Q 2 Q Q Q Q AND 256 256 V I AND 255 520 NEXT 530 IF Z 0 THEN GOTO 550 not variable length 540 PRINT PRINT Variable length command CRC is HEX Q 550 PRINT PRINT Press ENTER to return to Main Menu INPUT A 560 RETURN 570 accept a frame directive 580 PRINT Directive to Accept a Frame 590 OUT amp H303 1 600 PRINT IR line released now high again 610 GOSUB 1100 F D 620 PRINT Frame Type received HEX D 630 GOSUB 1100 C D 640 PRINT Opcode received HEX D 650 IF C AND 128 0 THEN GOTO 700 not variable length 660 GOSUB 1100 R D 67
43. er Manual Parallel Protocol write Press Enter to return to Main Menu readIn ch end acceptframe procedure sendframe var index integer ch char begin putbyte ftype putbyte opcode if leno in V v then begin cre 0 I zero out crc accumulator data olen mod 256 putbyte data data olen div 256 putbyte data end if leno in v V for index 1 to olen do begin data outdat index putbyte data crc 2 crc cre crc crc div 256 data mod 256 end for index 1 to olen if leno in v V then putbyte crc port Padr 3 1 writeln writeln frame type ftype writeln command opcode writeln for index 1 to olen do writeln index data outdat index if ftype TEST then writeln Test Frame writeln write Press lt Enter gt to return to Main Menu readin ch end sendframe SP232 User Manual 6 23 Parallel Protocol procedure requestservice var ch char begin writeln write Enter C ommand Q uery R esponse S tatus or T est readIn ch writeln set up default case ftype COMMAND command case ch of Q 7q ftype QUERY I query R r ftype RESPONSE Y response S s ftype STATUS Status Tt ftype TEST Test end case ch of writeln Request Service port Padr DevID port Padr 3 0
44. erted 1040 PRINT PRINT Press ENTER to return to Main Menu 1050 INPUT A RETURN 1060 Wait for 150XB C to accept a byte from us 1070 OUT amp H300 D 1080 S INP amp H302 IF S AND 128 0 THEN GOTO 1080 1090 RETURN 1100 wait for 150XB C to write us a byte 1110 D INP 8H300 1120 S INP amp H302 IF S AND 32 0 THEN GOTO 1120 SP232 User Manual 6 27 Parallel Protocol 6 28 1130 D INP amp H300 1140 RETURN 1170 reset routine 1180 RETURN 1190 Clean up amp exit the program 1200 OUT amp H303 1 put IR line back to high 1210 SYSTEM 1220 END SP232 User Manual
45. ervice center is located Customer shall be responsible for paying all shipping charges duties taxes and any other charges for products returned to any other locations This warranty shall notapply to any defect failure or damage caused by improper use or improper or inadequate maintenance and care Tektronix shall not be obligated to furnish service under this warranty a torepair damage resulting from attempts by personnel other than Tektronix representatives to install repair or service the product b to repair damage resulting from improper use or connection to incompatible equipment or c to service a product that has been modified or integrated with other products when the effect of such modification or integration increases the time or difficulty of servicing the product THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THIS PRODUCT IN LIEU OF ANY OTHER WARRANTIES EXPRESSED OR IMPLIED TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE TEKTRONIX RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES mm A Table of Contents Safety Summary secre e isete SS iii Operat
46. f parallel protocol that are common to serial protocol i e everything except the routines that put a byte and read a byte are common to both protocols The parallel FIO program allows you to interact with the 150XB C through Option Port protocol Its main loop is a menu driven switch or case statement that allows you to either request service from the 150XB C define parameters for a command to send to the 150XB C or quit the program The typical sequence is define a command request service to send the command then request service again to receive the result of the command The request service routine first asks for either a command query response status or test frame type Next the routine writes its ID number to the 8255 interface chip which latches it for the 150XB C to read later It also asserts an active low service request line to the 150XB C The 150XB C acknowledges the request by reading the ID number and writing a directive byte back to the computer The program then branches to the correct routine to handle that directive The reset directive indicates that the 150XB C has reset its internal variables such as at power on This means that pending requests for SP232 User Manual 6 11 Parallel Protocol 6 12 data are lost and the computer should reset its state to match the 150XB C If the 150XB C is holding the result of a prior request it will send an accept frame directive Otherwise 1t will send
47. g the Instrument This product is grounded through the parent instrument A protective ground connection is essential for safe operation Danger Arising From Loss of Ground Upon loss of the protective ground connection all accessible conductive parts including knobs and controls that appear to be insulating can render an electric shock Use Proper Power Cord Use only a power cord and connector specified for the instrument and in good condition Refer cord and connector changes to qualified service personnel Use Proper Fuses To avoid fire hazard use only correct fuses with voltage and current ratings specified for the instrument Do Not Remove Covers or Panels To avoid personal injury do not remove the instrument s covers or panels nor operate the instrument without covers and panels in place SP232 User Manual ili General Safety Summary Service Safety For Qualified Service Personnel Only Disconnect the instrument from its power source before removing covers and before soldering desoldering components iv SP232 User Manual A A Operating Instructions Operating Instructions Overview SP232 Extended Function Module This manual describes how to use the Tektronix SP232 Serial Extended Function Module EFM The SP232 is a plug in serial interface for Tektronix 1502B C and 1503B C Metallic Time Domain Reflectometers MTDRs In this manual all four MTDRs are collectively referred to as 150XB C The
48. gle Byte Argument 00h Wait for request default SP232 waits for ID byte then sends directive before sending responses from 150XB C to computer 01h Respond immediately SP232 sends responses as soon as received This requires a serial interrupt driver or very fast polled pro gram to catch the responses 02h Respond with RTS line is released by computer This permits the computer to signal for the data at the hardware level and avoids the extra frame handshake The RTS line must be asserted again before the next ID byte is sent Reset 150XB C Interface Re initializes the 150XB C Option Port and sends a reset directive lt opcode gt Set Stop Bits Sets number of stop bits per byte lt opcode gt lt argl gt 05h One byte containing 1 or 2 indicating one or two stop bits Default is 1 Byte 1 2 SP232 User Manual SP232 Serial Protocol Y A SP232 Serial Protocol Serial Hardware Protocol NOTE If you are writing an interrupt driven or low level driver for the SP232 you will need the information contained in the Serial Hardware Protocol subsection If you are programming the SP232 from a high level language you probably will not need to know the details of hardware protocol In most RS232 serial interfaces hardware protocol is handled by low level routines in the computer s operating system Serial hardware protocol is a subset of RS232 C which implements signals for Transmitted data Tx Received
49. he 150XB C Future additions to the command set will include other variable length frames SP232 User Manual 2 5 Serial Protocol Those commands queries or responses that require variable length arguments or data will contain a two byte unsigned integer length of data argument low byte first in frame bytes 3 amp 4 The length of data argument will be followed by the number of data or argument bytes indicated The last byte sent not counted in the length of data argument sent in bytes 3 amp 4 is a 1 byte CRC computed by doubling a 1 byte CRC accumulator and adding the next data byte to it with the carry from the doubling operation All bytes after the frame length bytes 5 onward except the CRC byte are used to compute the CRC checksum Status Frames The status frame is fixed length 2 bytes This allows the SP232 to notify the host computer of a bad frame If you receive a status frame it means that the last frame sent from the computer to the SP232 was not understood If this happens you may want to repeat the last frame to reset the 150XB C and repeat the last frame If you receive a status frame while waiting for a response to a query sent you will have to send the query again 2 6 SP232 User Manual A A 150XB C and SP232 Command Sets AA AA 150XB C and SP232 Command Sets 150XB C and SP232 Monitor Instructions The following instrument control instructions can be executed through the SP232 interface when i
50. is not complete the instrument will not send the waveform until averaging is complete If an SP232 request is received while the instrument is waiting it will override the previous query lt opcode gt lt argl gt lt arg2 gt lt arg3 gt 082h Data Type Byte Flag requests the following information about the response bit0 1 0 Current waveform 1 Stored waveform 2 Difference waveform 8 bits only 3 Reserved bit 2 0 Screen data 8 bits 1 Acquired data 13 bits bit 3 7 Cleared Binary waveforms are sent with no separators Starting Data Point Location in Waveform Ull Starting data point requested in waveform range is 1 251 Data points requested Ull Range is N 1 251 where N lt 252 starting data point If N is too large only those data points up to the 251st will be sent lt 0pcode gt lt length gt lt arg1 gt lt arg2 gt lt arg3 gt lt lt arg25 1 gt lt crc gt Number of data bytes transmitted 2 Bytes 1 502 For averaged data 1 byte per data point for un averaged data 2 bytes per data point First Data Point Ul2 UIT Size depends on type of waveform requested Nth data point Ul2 UI1 Size depends on type of waveform requested CRC of variable length data ul Cursor lt desc gt lt query gt 3 6 Query for distance to cursor lt opcode gt SP232 User Manual Command Set Cursor continued lt opcode gt 03h reply lt opcode gt lt argl gt lt argl gt Distance to
51. ll commands in detail Serial Software Protocol 2 4 Software protocol is based upon a master slave relationship that exists between the 150XB C and host computer Because data acquisition routines in the 150XB C cannot be interrupted the protocol provides service to the computer on a polled basis The polling frequency is determined by how much acquisition and display time is taken by the commands accepted for execution through the SP232 There are two levels of remote operation monitor and remote Monitor Operation The first level is simply monitoring the 150XB C control settings and requesting data periodically When monitoring the 150XB C operates normally always acquiring except for the time spent responding to queries from the SP232 Monitor operation is useful for manually setting acquisition parameters and capturing data for archive or processing by the SP232 Monitor operation has the poorest SP232 response character istic because most time is spent acquiring and displaying data in normal operation Remote Operation Remote operation consists of taking remote control of the 150XB C In remote operation the 150XB C s front panel is locked out however front panel controls may still be monitored The 150XB C display may be turned off for faster response and nearly all CPU time is spent accepting and executing commands through the SP232 SP232 User Manual Serial Protocol In remote operation the 150XB C acqui
52. me of information the device must hold the IR line low and place the first byte of the frame in its output buffer before the 10 millisecond time limit After the instrument reads each byte it will strobe IA to indicate to the device that it is time to place the next byte of data into its output buffer The device should release IR upon receiving the IA strobe after the last byte in the frame Send Frame Sequence IR NA ___ nh ___ data HHHHi H HHHHHHHi HHHHHHHH MHHHHH 5HH RD I ___ __ BE IWR o ab c d e f gp h i j kil read da latch data IA strobed instrument reads b device latches next by instrument strobes IA instrument reads data byte 1 device latches byte 1 of data instrument strobes directive byte directive byte written by instrument instrument reads ID byte service requested by device data at the Option Port interface Estimated Timing Intervals a b indefinite b c 1 lt x lt 50 microseconds c d 1 lt x lt 50 microseconds d e x lt 10 milliseconds e f 10 lt x lt 11 milliseconds f g I lt x lt 50 microseconds g h I lt x lt 100 microseconds h i 150 lt x 200 microsecond SP232 User Manual 6 7 Parallel Protocol 1 I lt x lt 50 microseconds j k 1 x lt 100 microseconds 3 1 150 lt x lt 200 microseconds 1 1 1
53. n parameters and capturing the data for archive or processing by the Option Port device This mode has the poorest Option Port response characteris tic because most of the time is spent acquiring and displaying data in normal operation The second level of operation is taking complete remote control of the instrument In this mode the instrument front panel is locked out the front panel controls may still be monitored The instrument SP232 User Manual Parallel Protocol display may be turned off for faster Option Port response and nearly all of the instruments CPU time is spent accepting and executing commands through the Option Port At this level the instrument will acquire data only when commanded to through the Option Port The software protocol is based on the assumption that all devices that connect to the instrument s Option Port contain a microprocessor capable of parsing a serial byte stream into status command and data according to the following description All data sent through the Option Port is composed into logical groups of bytes called frames A frame may be from two to several thousand bytes long depending on the frame type and amount of data to be conveyed The frame length will always be known to the sender before the frame is sent The majority of commands queries and responses have fixed length frames Those frames that may contain varying amounts of data will include a frame length field and be terminated by
54. noise filter dist div and Vp controls will be set immediately from the front panel hardware Display refresh and ac quisitions are enabled Remote is turned off However the instrument setup front panel settings and stored waveform data saved when remote was turned on are not restored These settings are lost This permits the SP 232 to configure the instrument and then turn it over for manual control lt opcode gt 1502B C 022h 1503B C 023h Sweep Enables and starts acquisition s A single acquisition will occur if instrument is in single sweep mode otherwise acquisitions will be continuous lt opcode gt Display Enables or disables front panel Ifthe display is disabled there Is faster SP 232 response and acquisitions can be taken at a faster rate lt opcode gt lt argl gt 024h Display On or Off Boolean TRUE Display disabled FALSE Display enabled Instrument Setup Performs instrument setup for vertical scale horizontal scale light 1502B C lt opcode gt lt arg1 gt lt arg4 gt 1503B C lt opcode gt lt arg1 gt lt arg3 gt 02bh Vertical Scale Byte 01 decibels 02 millirho Horizontal Scale Byte 01 feet 02 meters Instrument Setup continued SP232 User Manual 3 13 Command Set lt arg3 gt lt arg4 gt desc cmd lt opcode gt lt argl gt lt arg2 gt lt arg3 gt lt desc gt lt cmd gt lt opcode gt lt argl gt lt arg2 gt
55. nstalled in a 150XB C instrument In order to invoke the instructions the SP232 must be installed in the 150XB C the SP232 must be connected via RS232 cable to the host computer the host computer and the 150XB C must be powered up The instructions may be invoked whether the 150XB C is making measurements or not Currently there are two levels of operation possible 1 Level 1 Monitor The first level monitors instrument front panel controls and configuration 2 Level 2 Remote The second level monitors operational mode changes and can change the operational mode and reprogram software controls while blocking out the front panel Each instruction is listed by a description frame type opcode and arguments The arguments are one of the following types Byte Standard 8 bit value noted in hexadecimal Boolean Byte types with one of two values TRUE 0n 0ffh False Off 00h ul Unsigned 1 byte integer SIE Signed 1 byte integer 25 complement Ul2 Unsigned 2 byte integer Sp Signed 2 byte integer 25 complement UM Unsigned 4 byte integer S14 Signed 4 byte integer 25 complement For both levels any references to vertical and horizontal scale are dependent upon whether the instrument is configured for decibels or millirho and meters or feet The following show the differences when the unsigned integer is the value passed to from the SP232 SP232 User Manual 3 1 Command Set Vertical Scale UI1 x 4 2 DB
56. ommand work Of the 13 bits acquired by the A D converter only the top 7 are displayed by the 150XB C The display is mapped so that 1 LCD pixel is equal to 64 A D counts This is a constant relationship that does not change with gain or offset Offset is set by a 14 bit D A converter The values in the software Query Response and Command are 14 bit unsigned integers The top two bits are ignored in the Response and do not need to be set in the Command Offset is added to the sampled signal before the gain stages and before the A D At unity gain 0 dB two counts of offset equal one A D count At higher gains each count of offset has a greater effect at the A D The gain stages amplify about mid point on the A D converter A signal that is 15 pixels one division above the centerline on the LCD at unity gain will be 30 pixels two divisions above centerline at a gain of two 6 dB The offset D A is not centered exactly with the A D and gain stages In order to position a waveform accurately at any gain the true system zero offset point must be found Before describing how to determine the zero offset point it helps to examine the relationship between counts of offset voltage gain A D and LCD pixels The following table illustrates these relationships Counts Offset Volts and Gain dB A D Counts Pixels Change 128 I 0 dB 8 I G f 6w l 32 4 12 dB GA 1 SP232 User Manual Miscellaneous Information Counts
57. or Safety 42442 out ode a tans Seo a iii STUE SUE dur ee SS E A E 49 iv Operating Instructions OVERVIEW ERE EEE EEE aaa 1 1 IND PIICALIONS acini ee eee 1 1 Serial amp Parallel Communication 1 2 SP232 Description tay RO dd 1 2 SP232 SEID AG este 1 4 SP232 Specifics Il ES TRA OE CR ENS BR ARR 1 A O TE Die 1 5 SP232 Local Commands Arsen 1 5 Set BaudRale lt A 1 5 Set Response Mode 425 e ee iii 1 6 Reset MTDR Interface ovo sp ta DR a rs 1 6 Se Nope 1 6 SP232 Serial Protocol Serial Hardware Protocol x c 2s 26644342 i 2 1 Protocol Example uude ee eier 2 2 Serial Software Protocol unire iui 2 4 Basic Frame Descriptions sr e CE san 2 5 Fixed Length Frame Arguments Data Description 2 5 Variable Length Frame Arguments Data Description 2 5 Status Frames este Pag ON AO ec EEE 2 6 150XB C MTDR and SP232 Command Sets 15XB C MTDR s and SP232 Monitor Instructions 3 1 Instrument Setup tds bor kerk das 3 2 Acquisition Setup iu a atr rati de eae bom 658 820 302908 06 3 3 Hardware SE KH Sa vod Ne Eae 3 3 Wave ON S O 3 6 CUIDE Rufo scs RA ideo Rura OR Je VEU Diodes 3 6 Posse 3 7 I BG ee da ai 3 7 Remote sea Teen 3 8 Display merra er ve S RE SE se 3 8 AGQUISICION 22 een 3 8 Get BVIE a aia 3 8 Delay Bea Ben AAA dl 3 9 SP232 User Manual i Table of Contents 150XB CMTDR s and SP232 Remote Instructions 3 9 A 3 10 Commands san a Rad t ace d 3 12 150XB C M
58. putbyte DevID directive getbyte case directive of 7 5 acceptframe 6 4 sendframe 2 resetit end case directive of port Padr 3 1 put IR line back to unasserted high end requestservice begin main port Padr 3 192 set 8255 to mode 2 port Padr 3 1 set IR high unasserted repeat item menuchoice case item of R r requestservice E e editcommand end case item of 6 24 SP232 User Manual Parallel Protocol until item in q Q port Padr 3 1 set IR high unasserted again end Basic Version of Program 100 DEFINT B Z 110 DIM V 550 P 550 120 Main Menu 130 CLS 140 OUT amp H303 amp HCO OUT amp H303 1 150 PRINT Program to test 150XB C Option Port Protocols 160 PRINT S Simpson 24 June 1987 PRINT 170 PRINT 1 Request Service from 150XB C 180 PRINT 2 Edit Commands 190 PRINT 3 quit PRINT 200 PRINT Enter Selection number amp press ENTER IN PUTA 210 IF A 1 THEN BEEP GOTO 200 220 IF A 3 THEN BEEP GOTO 200 230 ON A GOSUB 250 430 1190 240 GOTO 130 250 General Request Service Dialog 260 CLS 270 PRINT Enter a 0 for command or 1 for query INPUT A 280 IF A O THEN F 16 ELSEF 32 290 PRINT PRINT Request Service PRINT 300 OUT amp H300 129 OUT amp H303 0 310 PRINT ID written amp IR asserted 320 GOSUB 1080 330 PRINT ID read by instrum
59. res data only when commanded through the SP232 Basic Frame Descriptions Software protocol is based on the assumption that the host computer is capable of parsing a serial byte stream into status command and data according to the following description All data sent through the SP232 is composed into logical groups of bytes called frames A frame may be from two to several thousand bytes depending on frame type and amount of data conveyed The frame length is always known to the sender before the frame is sent The majority of commands queries and responses have fixed length frames Those frames that contain varying amounts of data will include a frame length field and be terminated by a CRC field to verify the integrity of the data sent Byte 1 Frame type in high nibble 1 command values O and F are illegal 2 query values 5 E are reserved 3 response 4 status Low nibble contents are ignored Byte 2 Message byte containing specific command query or status code Fix Length Frame Arguments Data Description Most commands queries or responses that require arguments or data are fixed length Bytes 3 through the known length of the frame consist of arguments or data bytes in the order and format specified by the command query or response indicated in frame byte 2 Variable Length Frame Arguments Data Description The current command sets use only one variable length frame which is the waveform query response from t
60. return byte resetit outp PORT 3 1 system cls printf n nReceived Reset Directive n printf nPress space bar to return to Main Menu getch menuchoice system cls printf nProgram to test 150XB Option Port Protocols printf n nS Simpson 4 July 1987 n n printf nR Request Service from 150XB printf nE Edit Commands printf nQ Quit n printf nEnter Selection letter scanf 1s amp ch return toupper ch editcommand system cls printf nCommand Definition Section n SP232 User Manual 6 13 Parallel Protocol 6 14 printf nEnter Op Code scanf 3d amp command printf nEnter F for fixed or V for variable length command scanf 961s amp leno leno toupper leno printf nEnter Response length scanf 963d amp ilen printf nEnter Command frame length scanf 3d amp olen crc 0 for index 1 index lt olen index printf 96s 96d 96s nEnter data byte index scant 3d amp out index crc 2 crc cre crc crc 256 out index 4 255 if leno V printf n s d n Variable Length CRC is CIC printf nPress space bar to return to Main Menu getch acceptframe outp PORT 3 1 ftype getbyte switch ftype case Ox10
61. rol of the host computer use the Get Byte instruction to directly access locations in the instrument s EPROM The 150XB C uses a bank switched EPROM The highest location of both banks is 7FFFh The ROM checksum and ROM part number are stored in the EPROM both banks in the highest 10 addressed bytes The top 10 bytes are TFFFh High byte of checksum TFFEN Low byte of checksum 7FFDh Complement of lowest byte of ROM part number TFFCh Highest byte of ROM part number 7FFBh Middle byte of ROM part number 7FFAh Lowest byte of ROM part number 7FF9h High byte of bank switch address 7FF8h Low byte of bank switch address 7FF7h Bank ID byte either 0 or 1 TFF6h Instrument ID byte either 01 or 02 The Tektronix part numbers for programmed EPROMS are 9 digit numbers The first three numbers prefix indicates programmed ROM The middle four numbers are the base part numbers and the last two digits are the revision control numbers The byte address 7FFFCh contains the ROM version number in packed BCD format i e 160 4411 03 will have 03h at address 7FFCh The last 2 digits of the ROM base part number are in packed SP232 User Manual 5 1 Miscellaneous Information BCD format at 7FFBh and the first two digits of the ROM base part number are at address 7FFAh The byte at address 7FF6h will contain 01h for a 1502X and 02h for a 1503X Gain Offset via Computer This describes how the gain and offset parameters in the software setup c
62. s are then made and transmitted to the controller This way faults can be detected from a remote location Automation of soil moisture measurements can be done the same way as described in the cable testing example Serial and Parallel Communication There are two protocol methods by which the 150XB C can communicate with a host computer Through RS232 C serial protocol by using the SP232 module or through parallel protocol without the module The actual information communicated however is the same The most common method is by using the SP232 module and serial protocol which is compatible with most computer systems The less common parallel method requires a customer supplied parallel interface cable that connects the 150XB C to the host computer And the host computer must have a special parallel interface card installed See Chapter 6 for information about paralleled communication SP232 Description 1 2 NOTE This manual assumes that you know how to make measure ments using the 150XB C MTDR If necessary refer to their Operator Manual for operator information Also you should have knowledge of personal computer operation and programming SP232 User Manual Operating Instructions The SP232 sends and receives data bytes with 1 start bit 8 data bits and 1 stop bit Transmit and receive baud rates are the same and may be set at 300 600 1200 2400 4800 9600 or 19200 baud The factory set baud rate is 1200 which
63. s the query frame type which is ASCII character value 32 The second byte sent is the opcode for the waveform query which is ASCII character value 130 SP232 User Manual Serial Protocol In addition to opcode the waveform query needs three additional argument bytes that tell the 150XB C which waveform to send back the data format and how many data points to send back The first argument byte in this example is ASCII character value 0 This indicates that you want the current acquisition waveform sent with 1 byte per data point The second argument byte is ASCII character value 1 This tells the 150XB C to start with the first data point in the 251 point waveform The third argument byte is ASCII character value 10 This tells the 150XB C to end the response with the tenth data point in the 251 point waveform At this point in our example the SP232 has sent the send frame directive And it s time for your program to send the waveform query to the SP232 This is done by sending the frame type opcode and three arguments 1 byte at a time to the computer or by sending all five bytes in an ASCII string When the SP232 recognizes the waveform query frame it releases hardware line CTS until it has sent the query to the 150XB C This prohibits your program from sending another frame of data until the 150XB C receives the request and has responded Because this is a hardware function your program will see this as only a slight d
64. ser Manual Miscellaneous Information EFMCMD Demonstration Program The EFMCMD demonstration program is an interactive way to test commands when in serial communication mode When you invoke the EFMCMD program the first prompt asks if you want to enter a command request service from the 150XB C or quit the EFMCMC program Before requesting service enter the codes for a command using the Edit function Example m Run the EFMCMD program and type e to enter a new command In this example you are asked for the first 10 data points from the current 150XB C waveform in 8 bit format for each data point Enter all numbers in decimal Enter 32 to query the 150XB C for data Enter 130 for the opcode waveform query Enter 3 for command length Enter 0 for the first command argument data byte Enter 1 for the second command argument data byte Enter 10 for the third command argument data byte You will now be returned to the Main Menu Send the just entered commands to the 150XB C m Enter r to request 150XB C service The EFMCMD program will send frametype opcode and data Or print a message stating that a reset directive was received from the 150XB C The 150XB C always sends a reset directive the first time it responds to a service request after power up If the 150XB C responded with a reset directive request service again and the frame information should be sent The
65. the front panel of the SP232 3 Power up the 150XB C and the host computer Use the host computer as the controlling device as described in this and the remaining sections in this manual SP232 Specifications 1 4 Characteristic Requirement Supplemental Information Front panel RS232 C female 25 SP232 is DCE connector contact D type Data format Asynchronous 8 bit ASCII Does not support XON XOFF with 1 start and 1 stop bit Data rates 300 600 1200 2400 Selected by jumpers 4800 9600 19200 baud Signal voltage levels RS232 C compatible Typically 10 V nominal Batteryoperation of SP232 works in battery With reduced operating time per 150XB C operation battery charge EMI Additional radiated emissions may exceed host instruments specifications Environmental specs Does not compromise Will typically meet all host envi host instrument ronmental specs except salt atmosphere splash proof require ments SP232 User Manual Operating Instructions Options In order for the SP232 to function properly the host 150XB C instrument must have ROM version 5 0 or higher The ROM version is displayed when the 105XB C is powered up The display will show 150XB C ROM version XX where XX is the ROM version If the host 150XB C ROM version is below 5 0 order the proper ROM upgrade option from the table below These ROM upgrades must be installed by qualified service personnel Instrument Option 1502B B021134 and
66. the instrument from the Option Port must be valid for the last 200 nanoseconds of the CS period Also implicit in the hardware configuration is that the Option Port device is a passive peace of the instruments memory map with a single active low service request line IR This means that the Option Port device is a slave to the instrument processor which can present requests to the instrument but not assert any control over how and when those requests are actually fulfilled The correct way for the Option Port device to state its presence or request service is through the IR signal line The 5 volt supply to the Option Port will be turned on when IR is recognized by the instrument The instrument will then wait about 2 milliseconds for any device hardware using the 5 or 16 volt supplies to stabilize before attempting to read the device identification byte One the Option Port device has completed its power on sequence it should latch the IR line low until it receives an IA signal IA is not latched in the instrument Master Slave Handshake When the instrument sees the IR signal low it will read an identification byte from address O and then write a directive byte to address O of the Option Port device The identification numbers are arbitrary and assigned by Tektronix The directive byte indicates what action the device must perform The possible actions are accept new frame byte 7 send new frame byte 6 reset byte
67. yte repeat byte port Padr 2 until odd byte div 128 test for seventh bit set end putbyte function getbyte integer var byte integer begin byte port Padr repeat byte port Padr 2 until odd byte div 32 test for third bit set getbyte port Padr end 1 getbyte SP232 User Manual 6 19 Parallel Protocol 6 20 procedure resetit var ch char begin port Padr 3 1 writeln writeln Received Reset Directive writeln press Enter for Main Menu gt readin ch end resetit function menuchoice char var ch char begin ClrScr writeln writeln Program to test 150XB C Option Port Protocols writeln S Simpson 4 September 1987 writeln writeln R Request Service from 150XB C writeln E Edit Commands writeln Q Quit writeln write Enter Selection letter readin ch menuchoice ch ClrScr end menuchoice procedure editcommand var index integer ch char begin writeln writeln Command Definition Section writeln write Enter Op Code readin opcode write Enter F for fixed or V for variable length command readin leno SP232 User Manual Parallel Protocol write Enter Response length readin ilen write Enter Command frame length readin olen writeln crc 0 for index 1 to olen do begin write Enter data byte index

User Manual SP232 Serial Extended Function Module (for 1502B/C

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