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Model 996 Timer and Counter Operating and Service Manual

1. MEDEL 93 2 PAA S Wn Y43238 724738 ORTEC TM 8 IECt 408 INTERFACE orr S2 oN ADDRESS 1 0 ADDRESS ADDRESS 2 0 ADDRESS ADDRESS 4 0 ADDRESS ADDRESS 8 4 0 ADDRESS ADDRESS 18 5 0 ADDRESS RECYCLE ONE CYCLE COUNTER TIMER Hl COUNTER PRINTONLY a NORMAL Mandatory setlings Fig 3 Address Selection of Dip Switch on the 99X 2 IEEE 488 Interface Board 4 2 1 USING THE 99X 2 WITH A PRINTER By placing the PRINT ONLY NORMAL S2 8 to the PRINT ONLY position the 99X 2 Interface will drive a printer with an IEEE 488 GPIB interface directly if the printer is addressable as a Listen Only device A bus controller is not needed for this operation but only one Counting module can be connected to the printer This will allow the module to generate a hard copy of the data collected by controlling the module with the front panel controls When the inter face is installed a Counter Timer and started by the Count control each time the preset value is reached the data is automatically transferred to a printer If the Recycle mode is selected S2 6 Off the Counter data is cleared and anew cycle is started immediately If the One Cycle mode is selected S2 6 On the counter will halt until a reset is generated either by the front panel Reset switch or by the Dwell time expiring at which time a new counting cycle will begin Whe
2. 27 A 6 CATALOG OF COMMANDS FOR THE 996 27 APPENDIX B RESPONSE RECORDS FROM THE 996 MODULE 31 B 1 DELIMITING CHARACTERS 31 B 2 PERCENT RESPONSE 31 DOLLAR RESPONSE RECORDS 32 APPENDIX C OPTIONAL PARTS 5 33 C1 GABEES AND CONNEGTORS uu cett sinele simple sloni gingii Slog Slog ee 33 C 2 ORDERING INFORMATION 33 SAFETY INSTRUCTIONS AND SYMBOLS This manual contains up to three levels of safety instructions that must be observed in order to avoid personal injury and or damage to equipment or other property These are DANGER Indicates a hazard that could result in death or serious bodily harm if the safety instruction is not observed WARNING Indicates a hazard that could result in bodily harm if the safety instruction is not observed CAUTION Indicates a hazard that could result in property damage if the safety instruction is not observed Please read all safety instructions carefully and make sure you understand them fully before attempting to use this product In addition the following symbol may appear on the product ATTENTION Refer to Manual DANGER High Voltage Please re
3. COUNTER INPUT The 996 accepts and counts either fast negative logic pulses or positive pulses with an amplitude from 0 1 to 10 V The negative input threshold is fixed at 250 mV The positive input has a front panel threshold adjustment that is variable from 100 mV to 9 5 V A test point is included on the front panel to facilitate the adjustment process For positive logic pulses the threshold should be set well above the noise level of the input When used with a linear signal as the input the threshold should be set just above the noise level GATE INPUT A gate input signal or dc level can be connected to the 996 through the GATE input on the front panel With no input to this BNC or with a voltage level gt 3 V the 996 is enabled to accept counts through the inputs on the front panel To disable the timer and the counter the input at this connector must be pulled below 1 5 V To do this the driving source must be capable of sinking 5mA of current from the GATE input circuitry 3 6 OUTPUT CONNECTIONS INTERVAL OUTPUT A qc level that follows the condition of the counting gate is available at this front panel connector When the counting gate is enabled the dc level is nominally at 5 V When counting is inhibited by gating by having reached preset or by being stopped manually or remotely the dc level is nominally at 0 V This output can be used to gate other counters OVERFLOW OUTPUT The counter overflow output
4. Fig 5 Serial Poll Status Byte 18 easiest way to become familiar with programming the 996 via the IEEE 488 is to use the immediate mode of communications whereas the computer can be used as a terminal to exercise the commands This method can be used to become familiar with the protocol of the GPIB and the 996 communications structure The following examples for the Hewlett Packard and the IBM PC compatibles will show the command formats and responses from the 996 5 2 1 HEWLETT PACKARD COMPUTER EXAMPLES The first computer system discussed will be the Hewlett Packard which should apply to the HP 85 family and the 9816 9826 and the 9836 computers The computer should be set to terminate each data transfer with a line feed character Refer to the operating manual for setup procedures Since the Model 996 has just been powered up there will be a response record waiting to be transferred to the computer This response record must be read before the 996 will accept commands First a serial poll will be performed to show the service request bit set With the computer operating under BASIC execute the following commands A SPOLL 704 DISP A 64 In the above statement 7 selects the GPIB interface in the computer and 04 is the address of the 996 on the bus This automatically conducts a serial poll of the 996 and assigns the status byte which is an 8 bit binary value to the variable A When the variable A is displayed t
5. Minimum pulse width above threshold is 4 ns GATE Front panel BNC input connector accepts NIM standard slow positive logic pulses to control the counting condition of the entire module A level of gt 3 V or open circuit allows counting provided the instrument is in the COUNT mode and has not reached the preset value A level of lt 1 5 V inhibits counting The driving source must be capable of sinking 5 mA of positive current during inhibit The input is protected to 25 V 2 5 OUTPUTS INTERVAL Front panel output BNC connector furnishes a positive level during the counting interval The level is nominally 5 V when counting is enabled and lt 0 5 V when counting is disabled Z 30 0 OVFL Rear panel output BNC connector provides a NIM standard slow positive logic signal each time the counter overflows its 8 decade capacity The signal has a nominal amplitude of 5 V width 20 Us 2 6 INTERFACES PRINT LOOP When the print loop option board is installed it furnishes a rear panel 14 pin AMP CHAMP female connector containing signals for the standard ORTEC daisy chain print loop operations This option is field installable When connected in a print loop with an ORTEC Model 777A Printer this option offers automatic recycling of the counting and printing of all 8 digits of the counter along with any other counters in the print loop If the Model 777A is replaced with an ORTEC Model 879 Suffered Interface the prin
6. 7 segment LED display with leading zero suppression When displaying time two digits to the right of a decimal point are included OVERFLOW INDICATOR An LED indicator labeled OVF illuminates when the counter exceeds its capacity of 8 decades The indicator remains on until a reset is generated N AND P INDICATORS Three LED indicators aid in the selection of the preset value When the PRESET display function is activated the SEL select push button will select which of the three LEDs is illuminated When one of these LEDs is on that digit of the preset value can be incremented using the ADV advance push button DISPLAY Two LEDs labeled COUNTS and PRESET indicate the information being displayed in the counter display The counter or the PRESET value may be displayed by repeatedly pressing the DISPLAY push button until the desired LED is illuminated TIME BASE Three LEDs indicate the selected time base source By repeatedly pressing the TIME BASE push button 0 01 SEC 0 01 MIN or the EXT mode can be chosen GATE A single LED indicates that the entire instrument is enabled to count For the GATE LED to be illuminated the module must be placed in the COUNT mode either manually or via the interface option the GATE input must be above 3 V or open circuit and the preset stop condition must not have been reached REMOTE A single LED labeled REM indicates that the 996 is under computer control and that all front panel
7. The second and third words are not always used and are called nouns and modifiers respectively The following is a typical command SHOW_COUNT_PRESET In the preceding command SHOW is the verb and COUNT is the noun and PRESET is the modifier Only enough letters of a word to make it unique four letters are always sufficient need be used in a command The preceding command could thus be abbreviated to SH_COU_PRE A 2 DATA VALUES Some commands need to include data values Such values must be separated from the keywords by one or more spaces The data is also sent as ASCII characters and if more than one parameter is included in the value the parameter values must be separated by commas The following is a command with data values SET_COUNT_PRESET 75 3 In the preceding command the module is told to set the preset value to 75 X10 This represents a preset value of 75 000 Inthe command descriptions given in this appendix the following notation is important lt gt encloses a required value encloses an optional value CHECKSUMS A checksum may optionally be included at the end of a command record It is used by the module upon reception of the command to verify that the record was transmitted without error The actual checksum is a byte obtained by adding all of the bytes of the record together as if they were 8 bit unsigned binary integers Unless otherwise stated the checksum is to be tra
8. communications interface with a selectable baud rate from 50 to 19 200 The baud rate selection is made via a 4 position DIP switch located on the PWB Fig 2 The baud rate selected must match exactly the baud rate of the device to which the module is connected The switch settings are given in Table 3 Table 3 Baud Rate Selection Baud Rale 54 53 52 S1 50 Off On 75 On On Off Off 110 Off On Ott Off 134 5 On On On On 150 Off Off Off On 200 On Off On Off 300 Off Off On Off 600 On Ott Off On 1200 Off On Off Off 1800 Off On Off 2400 On Off Ott Off 4800 Off On On Off 9600 Off On On On 19 200 On On On On 19 200 On On On Off In addition to the baud rate selection the format of the data bits ASCII characters must also be set to match the device to which the module is connected To accomplish this an 8 position DIP switch Fig 2 20 mA CURRENT LOOP SELECTION PASSIVE ACTIVE we EN 5 TRANSMIT gee wa wI w2 RECEIVE gas BAUD wi s assy 770710 MODEL 99 P N 6905508 ID RS 232 C INTERFACE SCHH 726968 t antc ib TE e nan a re 2 STOP BITS E wal 5 WA RECYCLE 6 ONE CYCLE COUNTER TIMER PRINT ONLY Mandatory settings Fig 2 Changing Jumpers on the 99X 1 RS 232 C Interface Board is provided to allow the operator to select the n
9. START IREM SEND START COMMAND 83 ENTER 704 A REM READ RESPONSE RECORD 85 DELAY LOOP TO ALLOW COUNTS TO ACCUMULATE 86 FOR I 1 TO 200 NEXT I 87 OUTPUT 704 STOP I REM SEND STOP COMMAND 88 ENTER 704 REM READ RESPONSE COMMAND 89 IF A lt gt C THEN DISP ERROR IN STOP COMMAND STOP 90 REM NOW READ ACCUMULATED COUNTS 91 OUTPUT 704 SHOW COUNTS REM ASK FOR COUNT VALUE FROM 996 92 ENTER 704 ASI REM READ COUNT VALUE 93 DISP A REM VALUE PRINTED SHOULD MATCH COUNTER DISPLAY 94 READ SECOND RESPONSE RECORD FROM SHOW COMMAND 95 ENTER 704 A 86 REM END OF COMMUNICATIONS TEST 97 DISP END OF COMMUNICATIONS TEST 98 END 5 2 2 IBM PC PROGRAMMING EXAMPLES Before connecting the 996 to the IBM interface there are some important considerations regarding the setup of the software drivers which must be done before attempting to communicate with the 996 These are described in the installation and users guide which comes with the interface These include the creation or editing of a file called CONFIG SYS to let the DOS know that the interface is installed Also there are modifications which may have to be made to a file called GPIB COM This is done by running a program called IBCONF This allows the selection of the device number and address of the 996 on the bus These programs are described in detail in the Users Guide When these initial setup procedures have been completed connect the 996 to the com
10. WITH LFS 142 CALL IBWRT COUNTER WRT REM SEND COMMAND 143 REM WAIT FOR COMMAND TO BE EXECUTED 144 FOR 1 TO 160 NEXT 145 READ RESPONSE RECORD FROM INIT COMMAND 146 GALL IBRD COUNTER RO 147 REM 150 REM TEST MN REGISTERS FOR LOADING AND READING 152 FORI 11 to 99 STEP 11 153 WRT SET_COUNT_PRESET STR LF 154 CALL IBWRT COUNTER WRT REM SEND COMMAND 155 GALL IBRD COUNTER RD REM READ RESPONSE RECORD 156 REM 157 REM READ BACK VALUES LOADED AND CHECK FOR CORRECT VALUE 158 WRT SHOW_COUNT_PRESET LF 159 CALL IBWRT GOUNTER WRT 160 CALL IBRD COUNTER RD REM READ VALUE 161 MN MID RD 3 3 REM EXTRACT THE MN VALUE FROM RESPONSE 162 IF VAL MN lt gt THEN PRINT ERROR LOADING MN STOP 163 REM READ SECOND RESPONSE RECORD FROM SHOW COMMAND 164 CALL IBRD COUNTER RD 165 NEXT REM COMPLETE LOOP 170 REM TEST P REGISTER FOR LOADING AND READING 172 FORI 1 TO 6 STEP 1 173 WRT SET COUNT PRESET 1 STR LFS 174 CALL IBWRT COUNTER WRT REM 5 175 CALL IBRD COUNTER RD REM READ RESPONSE RECORD 176 REM READ BACK VALUES LOADED AND CHECK FOR CORRECT VALUE 177 WRT SHOW GOUNT PRESET LF 178 CALL IBWRT COUNTER WRT 179 CALL IBRD COUNTER RD REM READ VALUE 180 P MIDS RD 6 3 REM EXTRACT THE P VALUE FROM RESPONSE 181 IF VAL P lt gt I THEN PRINT ERROR LOADING MN STO 182 REM READ SECON
11. defined in the RS 232 C standard The 20 mA current signals are also included on this connector The signal connections are shown in Table 1 The signal names in upper case are the 20 mA current connections and the RS 232 C signal names are shown in lower case Table 1 AS 232 C Connections Signal protective ground transmit data 15 receive data 16 request to send 17 POSITIVE TRANSMIT 18 data set ready 19 signal ground 1 2 3 4 5 clear to send 6 7 20 data termina ready 8 9 23 POSITIVE RECEIVE 24 NEGATIVE TRANSMIT NEGATIVE RECEIVE When this interface is connected to another DTE device such as a computer or terminal a null modem cable must be used to match the proper signals between the two devices These cables are available at most computer equipment suppliers or directly from ORTEC See Appendix C Optional Parts List The connections of the null modem cable are given in Table 2 Table 2 Null Modem Cable Connections Pin Pin Computer No No 96 Protective ground 1 lt gt 1 Protective ground Signal ground lt gt 7 Signal ground Transmit data 2 lt gt 3 Receive data Receive data 3 lt gt 2 Transmit data Request to send 4 lt gt 5 Clear to send Clear to send 5 lt gt 4 Request to send Data set ready 6 lt gt 20 Data terminal ready Data terminal ready 20 lt gt 6 Data set ready The serial option is a full duplex asynchronous
12. ills ex WM dS 3 e 4 INR TSS Sama MAPLE 4 OW TR Us eroe E hua u UE Ut I Ete 4 2 6 INTERFACES Seat stiha 4 2 7 ELECTRICAL AND MECHANICAL 4 2 8 ORDERING INFORMATION gerere a ll ells lal e e 5 S INSTALLATION u rne yet alee gue aa ua SEIS ee gee alge Sale Sag eee oa Seige eg aa ele ale 5 3 T INPUT POLARITY SEEEGTIGON ire eie nte eiecit tecti tutti tecti tecti tuens 5 3 2 COUNTER INPUT SELECT JUMPER 6 3 34 GENERAL ira teu Sa Sa uum au dub a ka Aia do d da 6 3 4 CONNECTION TO 6 3 5 SIGNAL CONNECTIONS goes eg e re p vul yc que qp gles 6 3 6 OUTPUT CONNEGTIONS suu usa t t t eee eee tee e uuu qua gua a au 7 3 7 PRESET TIME OPERATION cece ell ella nter ata ol alll 7 3 8 PRESET COUNT OPERATION 7 4 OPERATING INSTRUCTIONS 8 4 1 RS 232 C INTERFACE MODEL 99X 1 8 4 1 1 20 mA CURRENT LOOP OUTPUT eee 9 4 1 2 USING THE 99X 1 WITH 9 4 1 3 I
13. the module A response record is created to show the results of the tests This response record must be read by the bus controller before the module will accept any command A service request SRQ is issued to notify the controller that service is required before commands can be accepted Commands sent to the module must be terminated with ASCII carriage return and line feed characters For every command received by the module a response record is returned and must be accepted by the controller before another command can be issued In case of aSHOW command to the module two response records must be read by the controller All response records from the module will be terminated with a carriage return line feed sequence with the EOI line asserted along with the line feed character Table 5 shows the switch configuration for address selection of the device on the bus Fig 3 The address selected is the total of the switches set to the Off position For example to select an address of 25 switches 1 1 4 8 and 5 16 should be set to the Off position The One Cycle Recycle switch determines the action that occurs when the counters reach a preset condition In the One Cycle mode the counters will stop at preset and hold the data until reset manually or remotely In the Recycle mode the contents of the counters will be transferred to a buffer the counters will be reset and another counting interval will be started immediately
14. the rear panel The overflow output for the counter is also located on the rear panel Counting these overflows on another counter effectively extends the counting capacity of the Model 996 The Model 996 derives its power from the 12 V and 6 V supplies in a standard NIM bin with power supply 2 SPECIFICATIONS 2 1 PERFORMANCE COUNT CAPACITY 8 decades for counts ranging from 0 to 99 999 999 MAXIMUM COUNTING RATE 100 MHz for negative input 25 MHz for positive input TIMEBASE 10 MHz clock with minimum preset or displayed intervals of 0 01 s or 0 01 min Synchronizing error is nominally 100 ns Also accepts an external input from the counter input when the EXT external mode is selected TIME BASE ACCURACY Within 0 0025 over the 0 50 C operating temperature range PRESET TIME COUNTS The module stops counting when the preset value MN X 10 is reached on the blind preset register M and N are digits ranging from 0 to 9 P is a digit ranging from 0 to 6 With the 0 01 SEC time base preset times from 0 01 to 990 000 s can be used Preset times from 0 01 to 990 000 min are available using the 0 01 MIN time base In the EXT time base mode preset counts in the range of 1 to 99 000 000 can be used POSITIVE INPUT DISCRIMINATOR Threshold variable from 100 mV to 49 5 V with a 25 turn trimpot PULSE PAIR RESOLUTION lt 10 ns for negative input 40 ns for positive input 2 2 INDICATORS COUNTER DISPLAY 8 digit
15. two 2 position jumpers W1 and W2 located on the PWB which are labeled DUAL and SINGLE These jumpers must be set to match the number of counters on the mother board into which the interface boards are connected If used with the Model 994 or 995 the jumpers must be set to the DUAL position If used with the Model 996 or 997 the jumpers must be in the SINGLE position OUAL 8 1 SINGLE d Fig 4 Selecting Operating Modes on the 99X 3 Print Loop Interface PWB The Print Loop Connection is made through a 14 pin connector accessible through the rear panel of the module A standard print loop cable ORTEC Model 772 C1 is used to connect the module to the other modules in the data acquisition system The connections in the cable are listed in Table 6 Table 6 Print Loop Signals Pin No Signal Name 1 Data 1 2 Data 2 3 Data 4 4 Data 8 5 Print 6 Print Advance 7 Previous Modute Finished 8 System Gate 9 System Preset 10 System Resel 11 Ground 12 Control 13 This Module Finished 14 This Module Printing The print loop signals are included in the 14 pin connector on the Print Loop Interface board and in each of the other units in the printing loop system All of the signals except one are in parallel to all units in the system The exception is Previous Module Finished as an input to the module and This Module Finished as an output to the next module This signal ripples through the printing loop
16. 000 36 39 0A 69 DEV4 The above command should have loaded a preset value of 25 X 10 Press the Display Select push button until Preset is selected for display The display should show 256 The next command should reset the preset value to zero DEV4 ibwrt clear_count_preset n 100 CMPL COUNT 19 DEV4 The display should now read 000 Press the Display Select until the counter is selected for display The display should read 0 DEV4 ibwrt start n 100 CMPL COUNT 6 DEV4 ibrd 12 2100 END CMPL COUNT 11 DEV4 The Gate light should be On and the counter display should be advancing 23 DEV4 ibwrt stop n 100 CMPL COUNT 5 DEV4 ibrd 12 2100 END CMPL COUNT 11 25 30 30 30 30 30 30 30 0000000 36 39 0A 69 DEV4 The counting should be stopped and the Gate light should be Off The next command asks for the counter contents with the SHOW COUNTS command DEV4 ibwrt show_counts n 100 CMPL COUNT 12 DEV4 ibrd 20 2100 END CMPL COUNT 10 30 30 30 3X 3X 3X 3X 3X 3B 0A 000XXXXX DEV4 ibrd 12 2100 END CMPL COUNT 11 25 30 30 30 30 30 30 30 0000000 36 39 0A 69 DEV4 The numbers represented by the Xs in the first record should match the numbers showing in the display of the 996 Remember that two response records must be read for every SHOW command Using the above examples refer to Appendix A and exercise the remaining commands to beco
17. 13 cm 1 35 X 8 714 in front panel per TID 20893 Rev WEIGHT Net 0 908 kg 2 0 Ib Shipping 1 4 kg 3 1 Ib POWER REQUIRED The Model 996 and the plug in options derive power from a NIM bin furnishing 12 V and 6 V The power required depends on the installed option as shown in the Power Requirements Table 2 8 ORDERING INFORMATION NOTE All three interface option boards use the same position in the module Only one can be plugged in at a given time 996 Basic module without plug in options 99X 1 RS 232 C Interface option cable not included 99X 2 IEEE 488 Interface option cable not included 99X 3 Print Loop Interface option Includes a 772 Cl Print Loop Cable 61 cm long with a double ended connector C 75 Female to female RS 232 C null modem cable 3 meter length C 80 Male to female RS 232 C extension cable 3 meter length C 488 1 IEEE 488 interface cable 1 meter length C 488 4 IEEE 488 Interface cable 4 meter length 772 Cl X S Print Loop Cable with double ended connector Specify the length X in feet POWER REQUIREMENTS TABLE pev sev 996 plus IEEE 488 option 1000 mA 996 plus RS 232 C option 1000 mA 996 plus Print Loop option 600 mA 3 INSTALLATION Before inserting the Model 996 into the bin set the switches and jumpers for the desired operating conditions There are several jumpers inside the 996 that allow the operator to select the mode of operation and ho
18. D RESPONSE FROM SHOW COMMAND 183 CALL IBRD COUNTER RD 184 NEXT REM COMPLETE LOOP 190 REM TEST START AND STOP COMMANDS 191 WRT START LFS 192 CALL IBWRT COUNTER WATS REM SEND START COMMAND 193 CALL IBRD COUNTER RD REM READ RESPONSE RECORD 195 REM ALLOW TIME FOR SOME COUNTS TO ACCUMULATE 196 FOR 1 TO 200 NEXT t REM DELAY LOOP 197 REM NOW STOP COUNTER AND READ COUNTS 26 198 WRT STOP LF 199 CALL IBWRT COUNTER WRT REM SEND STOP COMMAND 200 REM READ RESPONSE RECORD 201 CALL IBRD COUNTER RD 203 REM 210 REM READ COUNTS FROM 996 COUNTER 211 WAT SHOW COUNTS LF 212 CALL IBWRT COUNTER WRT REM SEND COMMAND 213 REM READ CONTENTS OF THE COUNTER AND DISPLAY THE VALUE 214 CALL IBRD COUNTER RD REM READ VALUE 215 PRINT RD REM DISPLAY VALUE 216 REM READ SECOND RESPONSE FROM SHOW COMMAND 217 CALL IBRD COUNTER RD 218 REM 220REM THIS CONCLUDES THE COMMUNICATIONS TEST 221 PRINT COMMUNICATIONS TEST COMPLETE 222 END 27 APPENDIX A ASCIICOMMANDS TO THE MODULE This appendix describes the ASCII command format used by the 996 module NOTE When controlling the module from a terminal lower case letters typed at the terminal are converted to upper case by the module before echoing the characters to the terminal and evaluating the command A 1 COMMAND WORDS command consists of words separated by under scores The first word of the command is a verb
19. ET is automatically generated COUNT Pushing this button enables the counting condition for the entire instrument providing the GATE input is not held below 1 5 V and the preset value has not been reached THRESH ADJ Front panel mounted 25 turn trimpot to adjust the positive input threshold for the counter The range is from 100 mV to 9 5 V Adjacent test point provides the TTL logic signal output from the discriminator to facilitate adjustment using an oscilloscope AUTOMATIC RECYCLE WITH DISPLAY DWELL Normally the Model 996 stops counting at the end of a counting interval and displays the contents of the counter until the RESET button is pushed Alternatively an automatic recycle counting mode can be enabled using jumper W1 on the printed circuit board When the automatic recycle mode is selected the display dwells for 1 or 10 seconds at the end of the counting interval At the end of the display dwell period the 996 is reset and the next counting display dwell cycle begins Using jumper W2 on the printed circuit board either a 1 or 10 s display dwell can be chosen The display dwell automatic recycle mode is disabled automatically when the 996 is under print loop control or computer control COUNTER TIMER JUMPER A two position jumper W3 located on the printed circuit board determines the information accumulated and displayed by the counter With W3 in the COUNTER position the counter always counts and displays the even
20. MMAND TO COMPLETE 33 FOR I 1 to 200 NEXT REM WAIT LOOP 34REM READ RESPONSE RECORD FROM 996 35 ENTER 704 A 36 REM 40 REM TEST COMMUNICATIONS FOR LOAD AND READ OPERATIONS OF MN VAL 21 41 1 TO 99 42 A SET COUNT PRESET amp VALS I amp 1 43 OUTPUT 704 A 43 ENTER 704 A REM READ RESPONSE RECORD 44 REM READ VALUE BACK TO INSURE PROPER LOADING 45 OUTPUT 704 SHOW_COUNT_PRESET 46 ENTER 704 A REM READ VALUE RECORD 47 A VAL AS 3 5 REM EXTRACT MN VALUE FROM RECORD 48 IF A lt gt THEN DISP ERROR LOADING MN STOP 50 READ SECOND RESPONSE RECORD FROM SHOW COMMAND 51 ENTER 704 A 52 REM COMPLETE LOOP FOR REMAINING VALUES 53 NEXT I 54 DISP MN VALUES LOAD OK 55 REM 60 REM NOW TEST FOR PROPER LOADING OF P VALUES 61 FORI 1706 62 OUTPUT 704 SET_COUNT_PRESET 10 91 REM LOAD P VALUE 63 ENTER 704 A REM READ RESPONSE RECORD 64 REM READ P VALUE BACK AND CHECK FOR PROPER LOADING 65 OUTPUT 704 SHOW COUNT PRESET 66 ENTER 704 ASI REM READ VALUE FROM 996 67 REM EXTRACT P VALUE FROM RECORD AND CHECK 68 P VAL ASI6 8 70 IF A lt gt I THEN PRINT ERROR LOADING P VALUE STOP 71 REM READ SECOND RESPONSE RECORD FROM SHOW COMMAND 72 ENTER 704 A 73 REM COMPLETE LOOP FOR REMAINING VALUES 74 NEXT I uar 75 PRINT P VALUES LOADING PROPERLY 76 REM 80 REM NOW TEST START AND STOP OPERATION 81 C 94000000069 REM CORRECT RESPONSE RECORD 82 OUTPUT 704
21. NSTALLATION INSTRUCTIONS 10 4 2 IEEE 488 GPIB INTERFACE MODEL 99X 2 10 4 2 1 USING THE 99X 2 WITHA 12 4 2 2 INSTALLATION INSTRUCTIONS 12 4 3 PRINT LOOP INTERFACE MODEL 99X 3 13 4 3 1 INSTALLATION INSTRUCTIONS 14 5 PROGRAMMING HE 996 ee EEEO Eee Y ERE RR 15 5 1 HS 282 C INTERFACE eese E UERECEREUEETrUCSUEUCUFCUCEUCUEREUGUHUECHCHUE CHE 15 5 1 TERMINAEOPERATION se uuu wees eels elie I eI egg oe 15 5 1 2 BASIC PROGRAMMING 16 5 2 INTERFACING TO THE IEEE 488 BUS 17 5 2 1 HEWLETT PACKARD COMPUTER EXAMPLES 18 5 2 2 IBM PC PROGRAMMING EXAMPLES 22 APPENDIX A ASCII COMMANDS TO THE MODULE 27 COMMAND WORDS 27 A20 DATA VALUES CREE URGE EE 27 A CHECK SUMS a rt cee ae lal acai A Aa 27 A 4 RESPONSE FROM THE MODULE 27 A 5 TIME UNITS USED IN COMMANDS
22. NTERFACING TO THE IEEE 488 BUS Of the three choices of interface the IEEE 488 interface holds the greatest potential for misunderstandings This section on programming the IEEE 488 will hopefully help smooth the interfacing The two computer systems discussed in this section are the Hewlett Packard and the IBM PC compatibles For other computers there should be enough information included to allow interfacing to the Model 996 The major difference between the Hewlett Packard computers and the IBM PC compatibles is the fact that Hewlett Packard includes software drivers in the high level languages but on the IBM compatibles the interface circuitry and the software drivers to interface to the IEEE 488 bus must be installed in order to complete the working system The most important aspect of interfacing to the IEEE 488 bus is ensuring that the address switches in the 996 are set correctly and that the correct address is used when accessing the 996 in a program statement Section 4 The other important consideration is to always read the response records from a previous command before trying to send another command otherwise the 996 will not respond Also when the 996 is powered up a series of self tests are performed and the results of these tests are included in the power up response record that must be read by the Bus Controller before any other commands are sent to the 996 Before attempting to connect the 996 to the compute
23. PRESET COMPUTER DISABLE_ALARM DISABLE_EVENT DISABLE_EVENT_PRESET DISABLE_TRIGGER_START DISABLE_TRIGGER_STOP ENABLE_ALARM ENABLE_EVENT_AUTO ENABLE_EVENT_PRESET ENABLE_LOCAL ENABLE_REMOTE ENABLE_TRIGGER_START 28 CATALOG OF COMMANDS Minimum Letters CL_ALL CL_COU CL_COU_PR CL_EV_PR COMP DIS DIS EV DIS EV PR DIS TRI STA DIS TRI STO EN ALA EN EV AU EV PR LOC EN REM EN TRL STA Description Clears counter count preset event counter and event preset Clears all counters in the 996 module Clears the M N and P values in the 996 Resets the event preset register to zero Sets the 996 to the computer mode where it does not echo any characters This is the complement to the TERMINAL command Disables the alarm function When the alarm is disabled the 996 does not auto matically send the contents of the counters to the host computer when the preset count value is reached The Dwell control is enabled and the 996 operates in the stand alone mode Disables the event counter in the 996 Disables the event preset function IEEE 488 operation only Disables the group execute trigger command from starting the counting cycle in the 996 IEEE 488 operation only Disables the group execute trigger command from stopping the counting cycle in the 996 Causes the 996 to transfer the contents of the counters to the host at the end of a pres
24. Printed in U S A Model 996 Timer and Counter Operating and Service Manual ORTEC Part No 736820 Manual Revision F 1202 Advanced Measurement Technology Inc a k a ORTEC a subsidiary of AMETEK Inc WARRANTY ORTEC warrants that the items will be delivered free from defects in material or workmanship ORTEC makes no other warranties express or implied and specifically NO WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE ORTEC s exclusive liability is limited to repairing or replacing at ORTEC s option items found by ORTEC to be defective in workmanship or materials within one year from the date of delivery ORTEC s liability on any claim of any kind including negligence loss or damages arising out of connected with or from the performance or breach thereof or from the manufacture sale delivery resale repair or use of any item or services covered by this agreement or purchase order shall in no case exceed the price allocable to the item or service furnished or any part thereof that gives rise to the claim In the event ORTEC fails to manufacture or deliver items called for in this agreement or purchase order ORTEC s exclusive liability and buyer s exclusive remedy shall be release of the buyer from the obligation to pay the purchase price In no event shall ORTEC be liable for special or consequential damages Quality Control Before being approved for shipment each ORTEC instrument must pass a
25. SHOW COUNT PRESET 220 INPUT 1 ANS 230 INPUT 1 RESP REM TWO RESPONSE RECORDS FOR A SHOW COMMAND 240 A MIDS ANS 3 3 250 IF A lt gt MN THEN PRINT MN A STOP 260 NEXT MN REM LOOP UNTIL ALL VALUES HAVE BEEN TESTED 270 REM CHECK FOR CORRECT LOADING OF P VALUES 280 FOR P 0 TO 6 STEP 1 290 REM LOAD P VALUES 300 PRINT 1 SET COUNT PRESET 01 P 310 REM READ RESPONSE RECORD 320 INPUT 1 RESPS 330 REM CHECK FOR CORRECT EXECUTION 340 IF RESP lt gt OK THEN PRINT RESP STOP 350 REM READ VALUE BACK FROM 996 AND CHECK FOR PROPER LOADING 360 PRINT 1 SHOW_COUNT_PRESET 370 INPUT 1 5 REM READ VALUE 380 INPUT 1 RESP REM READ RESPONSE RECORD 390 P MIDS ANSS 6 3 400 IF P lt gt VAL PS THEN PRINT ANS STOP 410 NEXT P 420 REM EXERCISE A FEW OF THE COMMANDS 430 PRINT 1 CLEAR_COUNT_PRESET 440 INPUT 1 RESPS 450 IF RESP lt gt 5 THEN PRINT RESP STOP 460 REM READ COUNTER VALUE 470 PRINT 1 SHOW COUNTS 480 INPUT 1 CNTS 490 INPUT 1 RESPS 500 IF RESP lt gt OK THEN PRINT RESPS STOP 510 REM LOAD DISPLAY SELECT AND READ IT BACK 520 PRINT 1 SET_DISPLAY 1 530 INPUT 1 RESP amp REM READ RESPONSE RECORD 540 PRINT 1 SHOW_DISP 550 INPUT 1 ANS READ VALUE BACK 560 INPUT 1 RESPS REM READ RESPONSE RECORD 570 D MIDS ANSS 3 3 580 IF VAL D lt gt 1 THEN PRINT 5 STOP 590 END 5 2 I
26. a precision integral discriminator on analog pulses For the latter application the TTL logic output of the discriminator is provided as a test point on the front panel This output can be used to trigger an oscilloscope while viewing the analog signal at the counter input on the oscilloscope The oscilloscope trace will show the signals that are being counted by the Model 996 thus permitting a very selective adjustment of the threshold See STANDARD NIM DIGITAL BUS NIM GPIS DOE ER 0173 U S NIM committee August 1983 IEEE Standard Digital Interface for Programmable Instrumentation ANSI IEEE Std 488 1978 The Institute of Electrical and Electronics Engineers 345 East 47 Street New York NY 10017 and Codes and Format Conventions for Use with ANSI IEEE Std 488 1978 ANSI IEEE Std 728 1982 The Institute of Electrical and Electronics Engineers 345 East 47 Street New York NY 10017 All the commonly used functions are conveniently accessible on the front panel Manual control of the COUNT STOP and RESET functions is via three push buttons The GATE LED is illuminated when the Model 996 is enabled to count Selection of the 0 01 s 0 01 min or external time base is made by the TIME BASE push button In the external mode the preset counter counts the events from the front panel positive or negative inputs The DISPLAY push button switches the display to show the contents of the counter or the preset stop value To change th
27. ad all safety instructions carefully and make sure you understand them fully before attempting to use this product vi SAFETY WARNINGS AND CLEANING INSTRUCTIONS DANGER Opening the cover of this instrument is likely to expose dangerous voltages Disconnect the instrument from all voltage sources while it is being opened WARNING Using this instrument in a manner not specified by the manufacturer may impair the protection provided by the instrument Cleaning Instructions To clean the instrument exterior Unplug the instrument from the ac power supply Remove loose dust on the outside of the instrument with a lint free cloth Remove remaining dirt with a lint free cloth dampened in a general purpose detergent and water solution Do not use abrasive cleaners CAUTION To prevent moisture inside of the instrument during external cleaning use only enough liquid to dampen the cloth or applicator Allow the instrument to dry completely before reconnecting it to the power source vii This instrument may have been manufactured with round LED indicators instead of triangular shaped ones as shown ORTEC MODEL 996 TIMER AND COUNTER 1 DESCRIPTION 1 1 GENERAL The ORTEC Model 996 Timer and Counter incorporates a 100 MHz 8 decade counter and a blind preset timer The basic model offers visual readout via an 8 decade LED display By plugging in field installable options considerably enha
28. any characters typed on the keyboard will be echoed to the terminal display Now that communication has been established try the following commands This command shows the version of firmware installed in the 996 This command shows the contents of the counter SET_COUNT_PRESET 35 4 000000069 E gt SHOW_COUNT_PRESET B035004CCC gt SET_DISPLAY 1 000000069 gt SET_DISPLAY 0 96000000069 gt This command loads the M N and P registers with the data values included The format is lt MN P gt where MN is any number from 0 to 99 and P is any value from 0 to 6 in this command the B response record shows the vaiue loaded in the preset registers 035 is the MN value 004 is the P value and CCC is the checksum This command selects the preset value to be displayed The display should show 354 for M N and P respectively This command selects the counter for display 16 Set up the 996 tor automatic data collection ENABLE_ALARM 000000069 gt Enable data transfer at end of preset SET_COUNT_PRESET 10 1 000000069 gt Set preset time for 1 second START Start data collection 99000000068 gt At the end of a 1 second interval and continuing at 1 second intervals the contents of the counter will be displayed on the terminal screen 00000100 00000100 00000100 This sequence will continue until STOP command is sent to the 996 actual contents of the counter will dep
29. controls are disabled This mode is set by the ENABLE REMOTE command 2 3 CONTROLS DISPLAY Push button selects the contents of the counter or the PRESET value for presentation in the 8 decade display Repeatedly pushing the button alternates the selection between the two choices as indicated by the COUNTS and PRESET LEDs SEL Select Push button chooses the M N or P digit in the display of the preset value Pushing the button advances the selection through the three choices as indicated by the illuminated LED The SEL push button operates only if the PRESET mode has been selected by the DISPLAY push button ADV Advance Push button increments the preset digit selected by the SEL push button once each time the ADV button is depressed The M and N digit ranges are both 0 to 9 The P digit range is from 0 to 6 The ADV push button operates only if the PRESET mode has been selected by the DISPLAY push button TIME BASE Each push on this button advances the selection one step through the three time base choices 0 01 SEC 0 01 MIN and EXT to determine the time base source for the preset register STOP This push button stops all sections of the instrument from counting RESET Depressing this button resets the counter to zero counts and turns off the overflow indicator It also clears any counts accumulated in the blind preset register but does not change the selected preset value When power to the module is turned on a RES
30. d Next press the Advance push button until the correct value for M appears in the display Press the Select push button and repeat the above procedure for the values of N and P The selected value is in the format of MN x 10 where MN is a number from 01 to 99 and P represents the power of 10 by which MN is multiplied For example to select a preset time of 15 00 seconds select an M value of 1 an N value of 5 and a value of 2 for P which represents 15 x 10 ticks of the 0 01 second time base The dwell period at the end of the preset interval is controlled by two jumpers W1 and W2 Fig 1 With W1 in the Off position the dwell function is disabled and the data collected will be displayed until a manual reset is initiated With W1 in the On position the data will be displayed for either 1 second or 10 seconds depending on the setting of W2 At the end of the dwell time an automatic reset is generated and the counting cycle will be repeated The dwell function is automatically disabled when an output option board is enabled to control the 996 To monitor the data collected during a counting period press the Display Select until the LED indicating COUNTS is lighted To start a counting cycle press the STOP push button then press the RESET push button and then press the COUNT push button The counting can be halted at any time by pressing the STOP push button If desired the cycle can be resumed from the point of interrup
31. d either by pressing the Stop control or by bringing the Master Enable or Gate input low the data which has accumulated in the counter will be transferred to the printer If the Recycle mode is selected the counter will be cleared and a new data collection cycle started as soon as the counter is enabled either by the Count control if the counting was terminated by the Stop switch or by the Master Enable or Gate going high if the counting was stopped by this signal If the One Cycle mode is selected the counter will continue counting from the point of interruption without being reset when reenabled to count When power is applied to the module the Model Number of the Module and the firmware version will be printed When any of the mode switches are changed the module must be powered up again before the changes are recognized 4 1 3 INSTALLATION INSTRUCTIONS To install the RS 232 C interface follow the steps listed below 1 Remove the left and right side plates from the module 2 Replace the two 5 8 metal stand offs on the printed circuit board in the module with the two 1 2 stand offs included in the mounting kit for the 99X 1 Interface Board 3 On the interface board set the switches to the desired positions using Tables 3 and 4 to match the device to which it will be connected 4 Install the interface board into the module sliding the RS 232 C connector through the slot in the rear panel of the module first and ali
32. e Gate light should now be On and the counter display should be accumulating counts OUTPUT 704 STOP ENTER 704 A DISP A 000000069 The Gate light should go Off and the counting should stop OUTPUT 704 SHOW_COUNTS ENTER 704 A DISP A XXXXXXXX ENTER 704 A 26000000069 The XXXXXXXX should match the value shown in the display of the 996 Remember that for every SHOW command two records must be read Using the above examples and the information in Appendix A exercise the remaining commands to become familiar with the commands and response records The following is a sample BASIC program to demonstrate the commands and responses in a program 20 10 EXAMPLE PROGRAM FOR COMMUNICATING WITH THE 996 FROM 11 REM COMPUTER IT IS ASSUMED THAT AN ADDRESS OF 415 12REM SELECTED FOR THE 996 AND 7 IS THE NUMBER OF THE GPIB 13 INTERFACE IN THE COMPUTER 14 CLEAR REM CLEAR DISPLAY 15 DIM A 25 20REM USE A SERIAL POLL TO FIND OUT IF THE 996 IS STARTING FROM 21 APOWER UP CONDITION 22 SPOLL 704 23 REM SKIP RESPONSE RECORD IF SERVICE REQUEST NOT SET 24 IF A lt 64 THEN GOTO 30 25 ENTER 704 A IREM READ POWER UP RESPONSE RECORD 26 IF C 900100007 THEN GOTO 30 REM TEST FOR POWER UP 27 DISP STARTING FROM POWER UP i 28 IF POWER UP THEN SKIP INIT COMMAND 29 GOTO 40 30 IF NOT POWER UP INITIALIZE 996 31 OUTPUT 704 INIT 32 REM WAIT FOR INIT CO
33. e preset value the PRESET mode must first be selected with the DISPLAY push button Subsequently the PRESET SELECT push button is used to choose N or P for adjustment Changing the value of M N or P is accomplished with the PRESET ADVANCE push button The display contains LED flags to indicate whether M N or P has been selected to warn when an overflow has occurred in the counter and to advise when the front panel controls are disabled by the computer in the remote mode When the Model 996 is used without a plug in option jumpers on the circuit board can select automatic recycling of the counting interval with a display dwell time of either 1 or 10 s at the end of each counting interval The plug in options disable the dwell automatic recycle function when enabled by an external controller The counting function of the entire module can be disabled by holding the GATE input below 1 5 V using an external signal source This condition also turns off the GATE LED Open circuit or greater than 3 V at the GATE input allows the instrument to count if the COUNT mode has been activated The INTERVAL output of another ORTEC timer can perform this function to synchronize the Model 996 counting with the other timer The INTERVAL outputs on all ORTEC timers provide nominally 5 V when counting and less than 0 5 V when counting is inhibited Interface connectors for the plug in IEEE 488 RS 232 C and print loop options are located on
34. end on the signal connected to its input STOP 000000069 gt 5 1 2 BASIC PROGRAMMING Refer to Appendix A and exercise the remainder of the commands until you are familiar with the actions and responses This will prove valuable when using the commands in a computer program Remember that for every SHOW command two response commands must be read Connect the 996 to the computer via the RS 232 C cable refer to Section 4 for proper cable connections The following BASIC program for the IBM PC and compatible computers shows some of the programming methods between the 996 and the computer 10 REM SAMPLE PROGRAM FOR THE IBM PC AND COMPATIBLES 20 REM OPEN SERIAL PORT FOR COMMUNICATIONS 30 REM SET PORT FOR 9600 BAUD NO PARITY AND 8 DATA BITS 40 OPEN COM1 9600 N 8 AS 1 50 REM DEFINE SUCCESS RESPONSE FROM THE 996 60 OKS 000000069 70 REM BO PRINT 1 INIT INITIALIZE THE 896 TO A POWER UP CONDITION 90 REM READ RESPONSE RECORD FROM THE 996 AND STOP IF NOT OK 100 INPUT 1 RESP 110 IF lt gt OK THEN PRINT RESPS STOP 120 REM TEST M AND N REGISTERS FOR PROPER LOADING 130 FOR MN 1 TO 89 STEP 1 140 MSG SET COUNT PRESET STR MN 1 150 PRINT 1 MSG 160 REM READ RESPONSE RECORD FROM 996 17 170 INPUT 1 RESP 180 REM CHECK FOR CORRECT EXECUTION OF COMMAND 190 IF RESP lt gt OK THEN PRINT RESP STOP 200 REM READ VALUE BACK AND CHECK IT 210 PRINT 1
35. error indications That is the indication of power up and self test results must all be considered in order to determine what actually happened in the event of an error For example see code below 005 002 could be derived by OR ing 001 with 004 power up just occurred and a self test failed with the 002 indicating that the ROM 1 test failed The following are percent code assignments response Command executed successfully 000 000 CCC Power up just occurred 001 000 CCC Power up self test failed 004 002 CCC ROM test failed 004 008 CCC RAM test failed Command syntax error 129 001 CCC 129 002 CCC 129 004 CCC 129 008 CCC 129 128 CCC 129 129 CCC 129 130 CCC 129 131 CCC 129 132 CCC invalid verb invalid noun invalid modifier invalid command data invalid first data value invalid second data value invalid third data value invalid fourth data value invalid command Communications error 130 001 CCC 130 002 CCC UART buffer overrun UART parity error 32 130 004 CCC UART framing error parameter 130 008 CCC IEEE 488 communications 96131 130 invalid third command parameter error 131 131 invalid fourth command 130 128 CCC input checksum error parameter 130 129 CCC input record too long 96 131 132 invalid number of parameters 130 130 CCC invalid input data record 131 133 invalid data other than 130 133 CCC aborted due to i
36. et interval without a direct command It also disables the Dwell control Causes the event counter to be advanced by one count each time the preset value is reached in the 996 Enables the event counter to stop after a preset number of counting cycles have occurred Places the 996 under local control the front panel controls The 996 will still respond to the communications interfaces and to commands from a host Places the 996 totally under the control of a host computer All front panel controls except the display select are disabled Enables the 996 to start a counting cycle on a group execute trigger command from the IEEE 488 bus This enables a number of counters to start simultaneously from a single trigger command 29 CATALOG OF COMMANDS cont d Minimum Command Letters Description ENABLE TRIGGER STOP EN TRLSTO Enables the 996 to stop a counting cycle on receiving a group execute trigger command from the IEEE 488 bus This is the complement to the ENABLE TRIGGER START command INIT INIT Causes the 996 to restart or initialize Same i as a reset or power up SET_COUNT_PRESET lt MN P gt SET_COU_PR Sets the preset value in the 996 to the value of the MN P parameter of the command MN can be any value from 01 to 99 and N can be any value from to 6 SET_EVENT_PRESET VALUE 5 Loads the value number between 1 99 999 999 to the event preset register C
37. et of jumpers on the interface board Fig 2 The transmit and receive loops can be individually selected to be active or passive The module is factory set at shipment with both the transmit and receive loops set for active The transmit and receive signals are included in the RS 232 C connector A special cable is needed when using the 20 mA current loop to connect the module to a computer or terminal This cable is available from ORTEC Appendix C Optional Parts List 4 1 2 USING THE 99X 1 WITH A PRINTER By placing the PRINT ONLY NORMAL 52 8 to the PRINT ONLY position the 99X 1 Interface will drive a printer with an RS 232 C interface directly This allows the module to generate a hard copy of the data collected without the need forcommands from a computer or keyboard When the interface is in stalled a Counter Timer and the module is started with the Count control each time the preset value is reached the data is automatically transferred to a printer If the Recycle mode is selected S2 6 Off the Counter data is cleared and a new cycle is started immediately If the One Cycle mode is selected S2 6 On the counter will halt until a reset is generated either by the front panel Reset switch or by the Dwell time expiring at which time a new counting cycle will begin When the interface is installed in a Counter Only module a counting cycle is started by the front panel Count control When the counting cycle is stoppe
38. gn the 40 pin connector on the back of the board with the pins provided on the counter board 10 Use care to ensure proper match up of connector and pins 5 nstall the two mounting screws into the standoffs provided on the counter board 6 Replace side panels and installation is complete 4 2 IEEE 488 GPIB INTERFACE MODEL 99X 2 The IEEE 488 1978 standard bus is a byte serial bit parallel interface system established primarily for the transfer of data and commands between the components of an instrumentation network The system is defined for no more than 15 devices interconnected by passive cabling whose total transmission length does not exceed 20 meters Data rates through any of the 16 signal lines that comprise the bus must be 1 M byte s and consist of digital data only The bus is connected in parallel to all components of the system and is designed to ensure reliable data transfer throughout the network Eight lines DIO1 DIO8 are used for the transfer of data between the components of the system Three lines DAV NRFD and NDAC are used as transfer control The remaining five lines IFC ATN SRQ REN and EOI are for bus management These lines may employ either open collector or tri state drivers as defined by the IEEE 488 1978 standard Information is transmitted over the eight data lines under direct supervision of the three transfer control lines Transfer proceeds as fast as the components of the
39. he value 64 is printed which is the decimal value of the 8 bit binary status byte Next the power up response record must be read before any commands will be accepted by the 996 ENTER 704 A DISP A 001000070 The ENTER statement reads the response record and assigns the input characters to the string variable A and the DISP statement prints the string to the screen In the following statements a command is sent to the 996 and the resulting responses from the 996 are read OUTPUT 704 SHOW VERSION ENTER 704 A DISP A FO996 001 ENTER 704 A DISP A 000000069 In the above commands the firmware version installed in the 996 is asked for the string is assigned to A and displayed to the screen and the response record is read which indicates that everything is O K Remember for every SHOW command two records must be read The next statement shows a command to the 996 which includes parameters along with the command OUTPUT 704 SET_COUNT_PRESET 25 6 ENTER 704 A DISP A 000000069 The above command should have loaded the preset count to a value of 25 X 105 Press the Display Select push button until the preset value is displayed The display should read 256 OUTPUT 704 CLEAR_COUNT_PRESET ENTER 704 A DISP A 000000069 19 The display should now read 000 Select the counter for display The display should now read 0 OUTPUT 704 START ENTER 704 A DISP A 000000069 Th
40. ld follow the same procedure and ORTEC will provide a quotation Damage in Transit Shipments should be examined immediately upon receipt for evidence of external or concealed damage The carrier making delivery should be notified immediately of any such damage since the carrier is normally liable for damage in shipment Packing materials waybills and other such documentation should be preserved in order to establish claims After such notification to the carrier please notify ORTEC of the circumstances so that assistance can be provided in making damage claims and in providing replacement equipment if necessary Copyright 2002 Advanced Measurement Technology Inc All rights reserved is a registered trademark of Advanced Measurement Technology Inc All other trademarks used herein are the property of their respective owners CONTENTS WARRANT Y sexe aah a ak a s ea DEE lace ii SAFETY INSTRUCTIONS AND SYMBOLS SAFETY WARNINGS AND CLEANING INSTRUCTIONS vi I ADESGRIPTION wesc Sg y sq uya unuq ete aa ee et 1 GENE ALD um um ESSERE Eee ee v ut 1 2 SPECIFIGATIONS u O asus 2 2 1 PERFORMANCE s mec cnet he ted te ee ene eee ed eek eg 2 2 2 INDICATORS 5 ae ae UNS ate ae 2 2 32 GON TROLS DISPLAY rts tt tt pt eu ERE E E
41. me familiar with the commands and the response records The following is a sample program written in BASIC to show how some of the commands may be used in a program The same format holds for any programming language used The following program must be preceded by steps 1 through 99 of the program DECL BAS see Installation Instructions in the IBM Interface Manual 100 REM 101 REM 102 REM 109 REM 24 THIS PROGRAM MUST BE APPENDED TO DECL BAS PROVIDED BY THE INTERFACE MANUFACTURER MAKE SOME ASSIGNMENTS 104 LF CHR amp HOA REM LINEFEED CHARACTER 105 COUNTER DEV4 REM REFER TO DEV3 AS COUNTER IN PROGRAM 106 GPIBO GPIBO GPIB0 REMAINS GPIBO 107 CALL IBFIND GPIB0 GPIB0 108 CALL IBFIND COUNTER COUNTER 109 OK 99000000069 REM RESPONSE GENERATED IF EVERYTHING 110 REM 111 REM 112 REM 120 REM 121 REM THIS PROGRAM TESTS THE COMMUNICATION BETWEEN THE 996 AND THE COMPUTER FIRST TEST THE SERVICE REQUEST TO SEE IF STARTING FROM A POWER UP 25 122 REM 130 CALL IBRSP COUNTER REM SERIAL POLL TO 996 131 S SPR amp 40 REM TEST SERVICE REQUEST BIT 132 IF 5 0 THEN GOTO 140 ELSE PRINT STARTING FROM POWER UP 133 CALL IBRD COUNTER RD REM READ POWER UP RESPONSE 134 REM 135 REM SKIP INIT COMMAND IF STARTING FROM POWER UP 136 GOTO 150 137 REM 140 REM SEND INIT COMMAND To 996 141 WRTS INIT LF REM ALL COMMANDS MUST TERMINATE
42. n the interface is installed in a Counter Only module a counting cycle is started by the front panel Count control When the counting cycle is stopped either by pressing the Stop control or by bringing the Master Enable or Gate input low the data which has accumulated in the counter will be transferred to the printer If the Recycle mode is selected the counter will be cleared and a new data collection cycle started as soon as the counter is enabled either by the Count control if the counting was terminated by the Stop switch or by the Master Enable or Gate going high if the counting was stopped by this signal If the One Cycle mode is selected the counter will continue counting from the point of interruption without being reset when reenabled to count When power is applied to the module the Model Number of the Module and the firmware version will be printed When any of the mode switches are changed the module must be powered up again before the changes are recognized 4 2 2 INSTALLATION INSTRUCTIONS To install the IEEE 488 GPIB interface follow the steps listed below 1 Remove the left side plate from the module 2 Remove the right side panel 3 On the interface board set the switches to the desired positions using Table 5 Set switch 7 to Counter Timer 4 Install the interface board into the module sliding the IEEE 488 GPIB connector through the slot in the rear panel of the module first and align the 40
43. nced readout and control capability can be added at any time For automated counting applications not requiring computer interfacing the standard ORTEC print loop function is available as a field installable plug in board In conjunction with an ORTEC Model 777 Printer this option offers automatic recycling of the counting and printing of all 8 digits of the counter s contents along with that of other counters in the print loop In place of the 777A the ORTEC Model 879 Buffered Interface can be utilized with the print loop This solution provides IEEE 488 and RS 232 C interfaces for all the counters in the print loop The Model 879 has the capability through the print loop to start and stop counting reset and read the contents of the counter in the Model 996 along with other counters in the print loop The full power of CCNIM Computer Controlled NIM is obtainable by adding the IEEE 488 option or the RS 232 C option These plug in boards yield computer control of all functions normally selectable from the front panel including start and stop count readout reset setting the preset value displaying the preset value displaying the counter contents and selecting the desired time base To eliminate accidental operator interference the computer can disable all front panel controls in the remote mode Computer readout with either of the two CCNIM options includes the contents of the counter the preset value and the curren
44. nsmitted as three ASCII characters representing the decimal equivalent of the binary integer decimal values range from 000 to 255 for 8 bit integers rather than a single binary byte The three checksum characters if present must be the last characters of the command record before the delimiter and must be separated from any data values by a comma If a data value is optional or not used a comma must precede the checksum for clarity A 4 RESPONSE FROM THE MODULE After a command has been transmitted from the computer or terminal to the module no other command should be issued until a response record has been received from the module The response record indicates how the module responded to the previous command and that the module is ready to receive another command Appendix B explains how the computer or terminal operator should interpret the response records A 5 TIME UNITS USED INCOMMANDS Delay is the time the module will wait before processing or responding to a command from the operator or computer Delay values must be given in special time units of 0 25 ms The computer operator must remember to enter the values for Delay properly A 6 CATALOG OF COMMANDS FOR THE 996 The commands on the following pages are arranged in alphabetical order Be sure to read the introductory material in this appendix before proceeding to the command descriptions Command CLEAR_ALL CLEAR_COUNTERS CLEAR_COUNT_PRESET CLEAR_EVENT_
45. nter with respect to the Time Base Selection Fig 1 The two positions are labeled TIME and COUNTS In the Time position the counter always counts the time base signals unless the External time base is selected in which case the signals at the front panel input are counted POS IN NEG IN With W3 in the TIME position the counter always displays the events driving the preset register In the COUNTS position the signals at the front panel input are always counted by the counter regardless of the time base selection The preset register becomes a blind timer in this position unless the External time base is selected The 996 is shipped from the factory with W3 set to the COUNT position 3 3 GENERAL The Model 996 Timer and Counter operates on 12 V and 6 V power furnished from a NIM standard bin and power supply such as the ORTEC 4001 4002D Series 3 4 CONNECTION TO POWER Always turn off the bin power supply before inserting or removing any modules The power supply voltage should be checked after all modules have been inserted The 4001 4002D series has test points on the power supply control panel to permit monitoring of the dc voltages When power is applied to the 996 an automatic reset function clears the counters to zero and provides a standard set of start up conditions 1 display select set to COUNTS 2 preset values of M N and P set to zero and 3 time base select set to 0 01 SEC 3 5 SIGNAL CONNECTIONS
46. nvalid handshake command data Execution error 96 131 134 CCC could not load selected value 131 135 counters must be stopped but were not 131 128 CCC invalid first command parameter 131 129 invalid second command B 3 DOLLAR RESPONSE RECORDS All other response records begin with the ASCII dollar sign character and another character to indicate the particular type of dollar record The A xxx CCC DL B xxx yyy CCC DL F xx DL G DL 1 x DL following dollar response records are available A A record is used to transmit one 8 bit unsigned binary integer The integer is transmitted as three ASCII character digits xxx which are the decimal equivalent of the binary integer The decimal value will be between 0 and 255 The final three characters CCC are three ASCII character digits representing the checksum value for the record as a three digit decimal value lt DL gt is an appropriate delimiting character See SHOW_DISPLAY and SHOW_MODE commands in Appendix A A B record is used to transmit two 8 bit binary integers The integers are expressed as two 3 digit decimal numbers xxx and yyy The values will fall between 0 and 255 The command that generates the B response is SHOW_COUNT_PRESET The final three digits CCC represent the checksum value for the record lt DL gt is the appropriate delimiting character The F response record is
47. o send the contents of the event counter This is an 8 digit number G00000000235 96000000069 Causes the 996 to send the contents of the event preset register This will be an 8 digit number G00000000235 96000000069 Causes the 996 to send a record showing which input is selected for the preset counter 0 seconds 1 minutes 2 external A000245 96000000069 Causes the 996 to send a record which shows the firmware version included in the 996 F0996 002 36000000069 Causes the 996 to start a counting cycle Stops the 996 from counting Places the 996 in the terminal mode so that every character received is echoed to and displayed on the terminal Causes the 996 to perform certain self test routines Only the ROM and RAM self tests are implemented 1 ROM test 4 RAM test 31 APPENDIX B RESPONSE RECORDS FROM THE 996 MODULE The 996 Timer and Counter sends various types of information to the controlling terminal or computer This appendix describes the types of responses the module makes to the various commands The operator must be familiar with the concept of a record that is a continuous stream of characters with a special character such as the ASCII carriage return or line feed marking its end B 1 DELIMITING CHARACTERS The end of a record transmitted between two devices must be marked by a special delimiting character The record delimiter forcommunications with the 996 module is ei
48. ounting will be stopped when the event counter reaches that value SET MODE EXTERNAL SET MOD EXT Selects the external input to the preset counter in the 996 SET MODE MINUTES SET MOD MIN Selects the minutes time base as the input to the preset counter SET MODE SECONDS SET MOD SEC Selects the seconds time base as the input to the preset counter SET DISPLAY VALUE SET DISP Selects the counter whose contents will be displayed on the 996 front panel 7 segment LEDs The value will be either 0 or 1 for Count and Preset respectively SHOW ALARM SH Returns a I response record showing the status of the alarm The answer is in the form of a for true and F for false Example IF SHOW COUNTS SH COU Shows the contents of the counter 00000000 96000000069 SHOW COUNT PRESET SH COU PRE Causes the 996 to transmit a D response record which includes the MN and P values presently selected D015004146 96000000069 SHOW DISPLAY SH DISP Causes the 996 to send a response record showing the number of the counter whose contents are being displayed in the digits on the front panel 0 COUNTS 1 PRESET A000144 96000000069 Command SHOW_EVENT SHOW_EVENT_PRESET SHOW_MODE SHOW_VERSION START STOP TERMINAL TEST lt NUMBER gt CATALOG OF COMMANDS cont d Minimum Letters SH_EV SH_EV_PRE SH_MOD SH_VER STA STO TER TEST Description Causes the 996 t
49. ower Supply 6V 638630 Cable Description 25 foot male female RS 232 C cable 641810 10 foot female female RS 232 C null modem cable 641830 C 75 3 meter length female female RS 232 C null modem cable 641820 Male male gender changer 641840 3 3 foot IEEE 488 cable 603620 13 2 foot IEEE 488 cable 641720 772 Cl print loop cable 462360 918 20 mA cable C19 609820 34 Table 1 Bin Module Connector Pin Assignments For Standard Nuclear Instrument Modules per DOE ER 0457T Pin Function 3 V 3V Spare bus Reserved bus Coaxial Coaxial Coaxial 200 V de Spare 10 11 6V 12 Reserved bus 13 Spare 14 Spare 15 Reserved 16 12V 17 12V 18 Spare bus 19 Reserved bus 20 Spare 21 Spare 22 Reserved OO GQ N Pin 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 Function Reserved Reserved Reserved Spare Spare 24 V 24 V Spare bus Spare Spare 117 V ac hot Power return ground Reset Scaler Gate Reset Auxiliary Coaxial Coaxial Coaxial 117 V ac neutral High quality ground Ground guide pin Pins marked are installed and wired in ORTEC s 4001A and 4001C Modular System Bins
50. pin connector on the back of the board with the pins provided on the counter board Use care to ensure proper match up of connector and pins 5 Install the two mounting screws into the stand offs provided on the counter board 6 Replace side panels and installation is complete 4 3 PRINT LOOP INTERFACE MODEL 99X 3 With this interface the module can be included a print loop with the other counters and timers from ORTEC Up to 50 counters can be included in a counting system with one controller such as the Model 879 Buffered Interface providing the interface from the loop to a computer or printout device ORTEC MODEL 9X 3 2 MONE 4 2 1 WASTER OF 2 ON 10K r 13 cami A four position DIP switch Fig 4 is located on the PWB to select one of the three operating modes Master Slave or Normal This switch determines the role of the individual modules when contained in a counting system As a Master the module drives the system gate and the system reset lines but does not respond to a system gate driven by another device As a Slave the module does not drive the system gate or the system reset signals but does respond to both In the Normal position the module does not drive or respond to the system gate or system reset signals When used with a Model 879 controller module the usual operating mode would be the Slave mode There are
51. puter and apply power to the 996 As with the H P computer it is much easier to become familiar with the command format and response records by using the computer in an immediate mode To do this with the IBM a program called IBIC must be run Type IBIC to start the program and follow instructions when the logo appears The following is a step by step example of communicating with the 996 The test appearing in upper case letters is generated by the computer commands typed by the operator are in lower case letters PRESS FOR HELP GPISO set dev4 DEV4 Commands to the 996 are only sent when the prompt DEV4 is present Because the 996 has just been powered up a power up response record will be waiting to be read A serial poll ibrsp command should confirm that the 996 is asserting the service request SRQ line on the bus DEV4 lbrsp 100 CMPL POLL 0X40 DEV4 The second line shows the contents of the status registers In this case it shows that the command was completed by the interface adapter The results of the poll 0X40 show that the service request was being asserted by the 996 40 hex is bit 6 of the serial poll status byte set to a 1 22 Next read the power up response record from the 996 This is done with the command ibrd xx where xx is the number of bytes to be read This number must be as large as or larger than the number of bytes expected Most response records from the 996 will be 11 by
52. r the address switches should be checked to ensure that the proper address is selected and does not conflict with another module connected to the bus The 99X 2 option is shipped from the factory with the address switch set for 4 If more than one 99X 2 is connected to the bus the addresses of all but one will have to be changed The address may be set for any number from 0 to 31 however 0 is usually used for the controller in charge and 31 is used as the untalk and unlisten commands Section 4 2 Table 5 Another important point to consider when communicating with the 996 is the fact that the 996 always asserts the Service Request SRQ signal line on the bus when information is available for transfer This will be reset by conducting a serial poll or by reading the response record from the 996 When a serial poll is conducted a serial poll status byte is transferred to the computer This byte contains information about the status of the 996 and is defined in Fig 5 The 996 will not accept another command until the response record is read The ready condition will be indicated by a serial poll status byte with only bit 4 asserted Install the Model 996 in the bin and connect the IEEE 488 bus cable to the connector on the rear panel of the 996 Turn On the power to the bin The Bit6 Bits Bit4 Bit 2 Bit 1 Bit 0 Ovillo Undefined Undefined Undefined Ready Undefined Requesting Service Undefined
53. r Data Another transfer control line used to indicate that all devices are ready to accept data NDAC Not Data Accepted The third transfer control line that indicates the acceptance of data by all devices ATN Attention A bus management line used to indicate the type of data on the data lines When the ATN line is asserted DIO 1 8 carry address or commands When ATN is false the data lines carry only data IFC interface Clear A bus management line which is used to place the system in a known state for system initialization SRO Service Request A bus management line used to indicate a need for service by a device in the system REN Remote Enable A bus management line used to select either local or remote control of each device 11 EOI End Or Identify The fifth bus management line used to indicate the end of a multiple byte transfer sequence This line is asserted with the last byte of a data record The IEEE 488 GPIB interface is a separate PWB that plugs into the module counter board and is held in place with two screws The connector containing the signals for bus communications is mounted to the board and is accessible through the rear panel of the module The placement of the connector is in accordance with the Standard NIM Digital Bus NIM GPIB with pin 1 of the connector to the top of the module When power is applied to the module a series of self test routines is executed to test certain parts of
54. rator to exercise the unit and view on the terminal display exactly what must be done inside a computer program to communicate with the 996 effectively A complete list of commands and responses is given in Appendix A of this manual 5 1 1 TERMINAL OPERATION The first step whether interfacing to a terminal or computer is to ensure that the proper cables are available and that the data format and baud rate switches are set correctly Tables 3 and 4 The actual settings are not as important as ensuring that the 996 and the device to which it is connected are set to exactly the same conditions These conditions include the baud rate number of data bits parity conditions and number of stop bits SHOW_VERSION F0996 002 960000000069 gt SHOW_COUNTS 00000000 000000069 gt Also setthe 996 to the Recycle mode When these conditions have been satisfied connect the terminal to the 996 and apply power to the terminal Next apply power to the 996 A response record should appear on the terminal screen showing the results of the self test at power up If all is well the response record should be 001000070 Since the 996 powers up in the Computer mode the first command to the 996 should be to change to the Terminal mode This is done by typing TERMINAL and a return on the keyboard These characters will not appear on the screen but the response record 000000069 and prompt gt should appear after the return Now
55. signals are available through the BNC connector located on the rear panel A slow positive logic signal nominally 5 V 20 Us appears at the connector each time the contents of the counter change from 99 999 999 to 0 The output signal can be used as the input to another counter to increase the total counting capacity beyond eight decades 3 7 PRESET TIME OPERATION The Model 996 is designed for standard operation as a counter that accumulates counts for a fixed period of time selected by the operator At the end of this time interval it will stop and hold the data until it is reset manually or it can dwell at the preset stop for a selected amount of time in which the data can be read It then resets automatically and repeats the timing cycle The use of the GATE input is optional depending on the application Determine the time interval required for the collection of counts If preset time is not desired the preset can be disabled by selecting a value of zero for M and N and the counting interval can be controlled using the COUNT and STOP push button switches on the front panel There are two internal time bases to select from 0 01 seconds and 0 01 minutes The choice is made by pressing the Time Base Select push button until the LED indicator for the desired time base is lighted To preset the time interval select PRESET as the displayed value Press the Select push button until the LED indicator for the M register is lighte
56. stringent set of quality control tests designed to expose any flaws in materials or workmanship Permanent records of these tests are maintained for use in warranty repair and as a source of statistical information for design improvements Repair Service If it becomes necessary to return this instrument for repair it is essential that Customer Services be contacted in advance of its return so that a Return Authorization Number can be assigned to the unit Also ORTEC must be informed either in writing by telephone 865 482 4411 or by facsimile transmission 865 483 2133 of the nature of the fault of the instrument being returned and of the model serial and revision Rev on rear panel numbers Failure to do so may cause unnecessary delays in getting the unit repaired The ORTEC standard procedure requires that instruments returned for repair pass the same quality control tests that are used for new production instruments Instruments that are returned should be packed so that they will withstand normal transit handling and must be shipped PREPAID via Air Parcel Post or United Parcel Service to the designated ORTEC repair center The address label and the package should include the Return Authorization Number assigned Instruments being returned that are damaged in transit due to inadequate packing will be repaired at the sender s expense and it will be the sender s responsibility to make claim with the shipper Instruments not in warranty shou
57. system can respond but no faster than the slowest device currently addressed by the bus This permits multiple data transfers to more than one device on the bus at a time Active devices connected into the system may be talkers listeners controllers or a combination of the three but no more than one device may be designated as a talker at any given time The controller determines the role of each of the devices by sending out an address of the device to be defined Addresses of the devices are set at the time of system configuration before power is applied by means of an 8 position DIP switch Sections 1 thru 5 of switch 1 are used for the address selection Table 5 The following are descriptions for the 16 bus lines defined in the IEEE 488 bus Table 5 Address Configuration Switch Position Off i On 1 Address 1 Address 0 2 Address 2 Address 0 3 Address 4 Address 0 4 Address 8 Address 0 5 Address 16 Address 0 6 Recycle Mode One Cycle Mode 7 Counter Timer Counter Only 8 Print Only Normal Mandatory settings DIO 1 THROUGH DIO 8 DATA INPUT OUTPUT These bidirectional lines are used to transfer data between devices Data is asynchronous and generally bidirectional The lines carry either data or address information depending on the state of the ATN line DAV Data Valid One of the three transfer control lines used to indicate that data is available on the DIO lines NRFD Not Read Fo
58. t display mode The IEEE 488 option also reads the overflow status for the counter Implementation of the IEEE 488 interface in the Model 996 is compatible with the NIM GPIB standard The CCNIM options can directly drive printers having RS 232 C or IEEE 488 ports Excellent flexibility in setting the preset value is offered by the MN X 10 selection The M and N values provide two digit precision while P selects the decade Presets can be chosen in the ranges of 0 01 to 990 000 seconds 0 01 to 990 000 minutes or 1 to 99 000 000 counts In the external EXT time base mode the 996 becomes a displayed preset counter The 996 can function as a displayed preset timer by changing the position of a circuit board jumper and using the 0 01 SEC or 0 01 MIN time base Both positive and negative sensing inputs to the counter are available on the front panel The negative input is designed to accept standard NIM fast negative logic pulses with a fixed threshold of 250 mV on a 50 Q input impedance The negative input can handle counting rates up to 100 MHz The positive input can accept counting rates up to 25 MHz on a 1000 Q input impedance To enhance the flexibility of the positive input a precision discriminator is included The discriminator threshold is variable over the range of 100 mV to 9 5 V using a front panel 25 turn trimpot The threshold can be adjusted to suit the amplitude of a specific source of logic pulses or used as
59. t loop will have IEEE 488 and RS 232 C interface capability allowing the computer to start and stop the counting reset the module and read the contents of the counter IEEE 488 When the IEEE 488 option board is plugged in it furnishes a rear panel standard IEEE 488 bus connector This 24 pin AMP CHAMP female connector allows the Model 996 to lie controlled from a computer via the IEEE 488 bus The field installable option provides computer control of the following functions COUNT STOP RESET REMOTE setting the preset value selecting the display mode and selecting the desired time base In the remote mode the computer can disable all front panel controls Computer readout includes counts the preset value the display mode and the overflow status SERIAL When the RS 232 C option board is plugged in it furnishes a rear panel 25 pin male D connector containing all signals for standard RS 232 C communications It also contains connections for 20 mA current loop communications The field installable RS 232 C option provides computer control of the following functions COUNT STOP RESET REMOTE setting the preset value selecting the display mode and selecting the desired time base In the remote mode the computer can disable all front panel controls Computer readout includes counts the preset value and the display mode 2 7 ELECTRICAL AND MECHANICAL DIMENSIONS NIM standard single width module 3 43 X 22
60. tes long including the line feed terminator Others may be shorter than the 11 bytes Appendix B DEV4 ibrd 12 2100 END CMPL COUNT 11 25 30 30 31 30 30 30 30 37 30 OA DEV4 0010000 70 In the above example the second line is the status register contents the third line is the number of bytes transferred by the 996 module to the computer the fourth and fifth lines show the characters transferred with the hexadecimal value on the left and the ASCII characters on the right Now the 996 is ready to accept commands from the computer The next example sends a SHOW VERSION command to the 996 that will cause the 996 to send the version of firmware installed in the module The n characters in the command cause the computer to send a line feed new line character along with the command This must be included before the 996 will execute the command DEV4 ibwrt show version n 100 CMPL COUNT 13 DEV4 Now read the version number DEV4 ibrd 12 2100 END CMPL COUNT 11 24 46 30 39 39 36 2D 30 30 32 OA FO996 0 02 DEV4 Now read the response record DEV4 ibrd 12 2100 END CMPL 25 30 30 30 30 30 30 30 0000000 3 36 39 OA 6 9 DEV4 The next command will load a preset value to the 996 This is an example of a command that must include parameters DEV4 ibwrt set count preset 25 6 n 100 CMPL COUNT 22 DEV4 ibrd 12 2100 END CMPL COUNT 11 25 30 30 30 30 30 30 30 0000
61. ther a carriage return or a line feed character or both as follows INPUT from either RS 232 C or IEEE 488 Either a carriage return or a line feed character will be accepted OUTPUT to IEEE 488 A line feed character is always used OUTPUT to RS 232 C Either a carriage return or the two character combination of a carriage return and a line feed may be appended to a record transmitted over the RS 232 C interface B 2 PERCENT RESPONSE RECORDS This type of record is called a percent record because it always begins with the ASCII percent character A percent record is always transmitted after the execution of a command by the module it tells whether the command execution was successful and if not what type of error may have occurred Execution of a subsequent command cannot begin until the module has transmitted the percent response record terminating the current command Percent response records are fixed in length and have the following format the spaces are for readability and are not part of the record yyy ccc lt DL gt where is the ASCII percent character the next three bytes xxx are a code for the general type of error the second three bytes yyy are the specific type of error and the final three bytes ccc are the checksum bytes Appendix A lt DL gt is an appropriate delimiting character Appendix B Records beginning with 001 002 and 004 can be OR ed together to obtain composite
62. tion by pressing the COUNT push button without pressing RESET 3 8 PRESET COUNT OPERATION To select the preset count mode of operation press the Time Base Select push button until the LED representing the External made is lighted Now the input to the preset register is taken from the front panel counter inputs POS IN NEG IN The preset value selection is identical to the selection of the time interval except that the preset value is in units of input counts rather than units of time 4 OPERATING INSTRUCTIONS There are three interfaces available for the module to facilitate the integration into a system environment 1 the RS 232 C Serial interface which includes a 20 mA current loop circuit 2 the IEEE 488 GPIB interface 1978 standard digital interface bus and 3 the ORTEC standard print loop interface Each of these interfaces is a separate plug in card that is easily installed in the field 4 1 RS 232 C INTERFACE MODEL 99X 1 This Serial Communications Interface conforms to the EIA RS 232 C Standard and contains all the circuitry needed to communicate with most ASCII terminals and with most computers equipped with a Serial Communications Port The connection is made with a standard 25 pin male D connector mounted directly to the interface printed wiring board PWB The connector is accessible through a slot in the rear panel of the module This connector is wired as DTE data terminal equipment device as
63. to indicate to each module when its turn to transfer data has occurred The order in which modules transfer data is determined by the cables and their relative positions in the loop DATA LINES 1 2 4 8 transfer the four bits of BCD data from the assigned module to the Controller module Each module drives these lines only during its turn for printing PRINT prepares the modules in the loop for data transfer PRINT ADVANCE advances the module through its digits during data transfer It starts with the most significant digit and scans sequentially to the lowest significant digit PREVIOUS MODULE FINISHED starts the actual data transfer from an instrument when its turn has occurred SYSTEM GATE carries a signal to all modules set for Slave operation in the system loop This signal 14 can be used to synchronize the data collection time for all modules in the loop SYSTEM PRESET carries a signal to all modules in the system loop A preset condition stops data collection in all modules in the loop SYSTEM RESET carries a Reset signal to all modules in the loop except any that may be set for Normal This signal originates in the Master module or in the Controller module GROUND provides a common ground reference to all modules in the system loop CONTROL carries a signal to indicate when the controller is in charge of the loop This signal is used to disable the Dwell function in any module in the loop that contains this f
64. ts connected to the front panel input POS IN NEG IN With W3 setto the TIMER position the counter counts and displays the time if either the 0 01 SEC or the 0 01 MIN time base is selected If the EXT time base is selected the counter will count and display the events from the front panel inputs POS IN or NEG IN 1 CYCLE RECYCLE Selection of either the 1 CYCLE or the RECYCLE mode can be made via an 8 pin DIP switch on the IEEE 488 and the RS 232 C interface boards The RECYCLE mode can be used when the computer is able to respond with a data transfer when the 996 reaches the preset value Upon reaching preset the 996 latches its data into a buffer resets the counters and starts the next counting interval This process takes approximately 50 Us The computer reads the data in the buffer before the next counting interval ends In the 1 CYCLE mode the 996 simply stops counting and waits for further commands when the preset value is reached 2 4 INPUTS POS IN Positive Input Front panel BNC connector for the counter input accepts positive unipolar signals with a minimum width above threshold of 20 ns at a 50 duty cycle Threshold is adjustable from 100 mV to 9 5 V via a front panel 25 turn trimpot Z 1000 to ground dc coupled NEG IN Negative Input Front panel BNC connector for the counter input accepts 600 to 1800 mV fast logic pulses with a fixed discriminator threshold of 250 mV 2 50 dc coupled
65. umber of data bits parity enable or disable odd or even parity if enabled and either one or two stop bits These must match the device to which the module is connected Table 4 defines these selections Table 4 Data Format Switch Position On 1 8 Data Bits 7 Data Bits 2 Enable Parity Disable Parity 3 Even Parity Odd Parity 4 2 Stop Bits 1 Stop Bit 5 6 Recycle One Cycle Mode 7 Counter Timer Counter Only 8 Print Only Normal Mandatory settings The 99X 1 option is shipped from the factory with the following settings Character length set to 8 bits Parity check and generation disabled Parity selection set to even Stop bit selection set for 1 Baud rate set for 9600 One cycle mode selected Counter Timer selected NORMAL N 4 1 1 20 mA CURRENT LOOP OUTPUT The 20 mA current loop operates in exactly the same way as the RS 232 C All switch selections apply equally to the 20 mA current loop communications The major difference in the two modes is the electrical characteristics of the signals The RS 232 C uses a change in voltage to transmit and receive data and the 20 mA current loop uses a change in current to transmit and receive data The current loop is optically coupled to the module and can be made to be either active current for the loop supplied by the module or passive current for the loop supplied by the connected device by changing a s
66. unction THIS MODULE FINISHED carries a signal to the next module in the loop arrives as PREVIOUS MODULE FINISHED to indicate its turn to transfer data has occurred THIS MODULE PRINTING carries a signal to the controller to indicate to the controller that the module presently transferring data has a number other than six decades of data to transfer to the controller This line is only driven during the module s turn to transfer data 4 3 1 INSTALLATION INSTRUCTIONS To install the PRINT LOOP interface follow the steps listed below 1 Remove the left side plate from the module 2 Remove the right side panel 3 On the interface board set the switch to the desired position Master Slave or Normal 4 Set both W1 and W2 jumpers for Models 994 and 995 to the DUAL position and Models 996 and 997 to the SINGLE position 5 Install the interface board into the module sliding the PRINT LOOP connector through the slot in the rear panel of the module first and align the 40 pin connector on the back of the board with the pins provided on the counter board Use care to ensure proper match up of connector and pins 6 Install the two mounting screws into the standoffs provided on the counter board 7 Replace side panels and installation is complete 15 5 PROGRAMMING THE 996 5 1 RS 232 C INTERFACE To become familiar with the 996 commands and response records it is suggested that a terminal be used This allows the ope
67. used to transmit a variable length string of printable ASCII characters shown here as xx It may consist of one or more characters No checksum is used and DL is an appropriate delimiter The command generating a F record is SHOW VERSION A G response record is used to transmit an 8 digit decimal value represented here as The decimal value will be between 0 and 99 999 999 The checksum represented as CCC will be 3 digit number and lt DL gt will be an appropriate delimiting character The commands generating this record are SHOW EVENT and SHOW EVENT PRESET A 1 response record is used to transmit a single character record either an ASCII T for true or an ASCII F for false represented in the example by x DL is an appropriate delimiting character The command generating this record is SHOW ALARM 33 APPENDIX C OPTIONAL PARTS LIST C 1 CABLES AND CONNECTORS C 2 ORDERING INFORMATION A maximum cable length of 50 feet should be used Information about or orders for parts should be for the RS 232 C interface The following cables submitted to an ORTEC sales representative or to should only be used for data rates of 9600 baud or the following address less higher rates require shielded cables to minimize RF interference with other devices located ORTEC in the area ATTN Nuclear Instruments 801 South Illinois Avenue Oak Ridge TN 37831 0895 U S A ORTEC Part No Module Description 459 P
68. w the time is displayed The left side panel must be removed to gain access to these jumpers Also if a communications interface is installed an 8 position DIP switch must be set up correctly for the particular system to which it is connected 3 1 INPUT POLARITY SELECTION The 996 accepts and counts either fast negative logic pulses or slow positive logic pulses Determine the type of input pulses that will be furnished and select the correct input BNC to accommodate the type of pulses There are two important points to consider when supplying signals to the 996 1 A single pulse must cross the threshold level only one time Signals with overshoot or ringing will be counted more than once if such anomalies cause the signals to cross the threshold level 2 Single pulses with slow rise and fall times should be as clean as possible to prevent multiple counting As a slow signal approaches the threshold a small spurious noise pulse can traverse the threshold level and return causing an extra count to be added When using the negative inputs the threshold pot should be set at gt 1 V This prevents any accidental triggering due to high ground currents present at counting rates of 100 MHz 017 9AMCTRAB DISABLE 1 SEC ENABLE 10 SEC Fig 1 Selecting the Dwell Period 3 2 COUNTER INPUT SELECT JUMPER Jumper W3 located on the Counter Board mother board allows flexibility in selecting the input to the cou

Model 996 Timer and Counter Operating and Service Manual

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