Using the Status Registers
The following example shows how you can use the multimeter’s status
registers to determine when a command sequence is completed. For
more information, see “The SCPI Status Model,” starting on page 134.
The example is shown in HP BASIC and QuickBASIC (see page 190).
10 REAL Aver,Min_rdg,Max_rdg
20 INTEGER Val,Hpib,Mask,Task
30 ASSIGN @Dmm TO 722
40 CLEAR 7 ! Clear HP-IB and dmm
50 OUTPUT @Dmm; "*RST" ! Reset dmm
60 OUTPUT @Dmm; "*CLS" ! Clear dmm status registers
70 OUTPUT @Dmm; "*ESE 1" ! Enable "operation complete" bit to set
! "standard event" bit in status byte
80 OUTPUT @Dmm; "*SRE 32" ! Enable "standard event" bit in status byte
! to pull the IEEE-488 SRQ line
90 OUTPUT @Dmm; "*OPC?" ! Assure synchronization
100 ENTER @Dmm; Val
110 !
120 ! Configure the multimeter to make measurements
130 !
140 OUTPUT @Dmm; "CONF:VOLT:DC 10" ! Set dmm to 10 volt dc range
150 OUTPUT @Dmm; "VOLT:DC:NPLC 10" ! Set the integration time to 10 PLCs
160 OUTPUT @Dmm; "TRIG:COUN 100" ! Dmm will accept 100 triggers
170 OUTPUT @Dmm; "CALC:FUNC AVER;STAT ON" ! Select min-max and enable math
180 OUTPUT @Dmm; "INIT" ! Place dmm in "wait-for-trigger" state
190 OUTPUT @Dmm; "*OPC" ! Set "operation complete" bit in standard event
! registers when measurement is complete
200 !
210 Hpib=7
220 ON INTR Hpib GOSUB Read_data
230 Mask=2 ! Bit 1 is SRQ
240 ENABLE INTR Hpib;Mask ! Enable SRQ to interrupt the program
250 !
260 ! Execute other tasks while waiting for data
270 !
HP-IB Operation Using HP BASIC
Continued on next page
Chapter 6 Application Programs
Using the Status Registers
188
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