HP 8920A Programmer's Manual page 304

Chapter 5, Advanced Operations
HP-IB Service Requests
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500 !
510 ! Set up the Calibration Status Register Group Enable Register to
520 ! generate the Summary Message.
530 !
540 OUTPUT Inst_address;"STAT:CAL:ENAB";Calibration_reg
550 !
560 ! The Calibration Status Register Group Summary Message is passed to
570 ! the Status Byte Register through Bit 8 in the Questionable
580 ! Data/Signal Register Group Condition Register. The Questionable
590 ! Data/Signal Register Group must be configured to set its Summary
600 ! Message TRUE if the Summary Message from the Calibration Status
610 ! Register Group is TRUE. Therefore Bit 8 (2^8=256) in the Questionable
620 ! Data/Signal Register Group Enable Register must be set HIGH.
630 !
640 OUTPUT Inst_address;"STAT:QUES:ENAB 256"
650 !
660 ! 3) Hardware Status Register #1 Group
670 ! Condition register conditions which will set the Summary Message
680 ! TRUE if they occur:
690 ! Bit 5: Measurement limits exceeded
700 ! Bit 4: Power-up Self-test failed
710 ! Bit 3: Overpower protection tripped decimal value = 2^3 = 8
720 !
730 Hardware1_reg=32+16+8
740 !
750 ! Set the Transition Filters to allow only positive transitions in
760 ! the assigned condition(s) to pass to the Event Register
770 !
780 OUTPUT Inst_address;"STAT:HARD1:PTR";Hardware1_reg
790 OUTPUT Inst_address;"STAT:HARD1:NTR 0"
800 !
810 ! Set up the Hardware Status Register #1 Group Enable Register to
820 ! generate the Summary Message.
830 !
840 OUTPUT Inst_address;"STAT:HARD1:ENAB";Hardware1_reg
850 !
860 ! 4) Set the correct Summary Message bit(s) in the Service Request
870 ! Enable Register to generate a Service Request (SRQ) if the
880 ! Summary Message(s) become TRUE.
890 ! Bit 5 = Standard Event Status Register Summary Message
900 !
910 ! Bit 3 = Questionable Data/Signal Register Group Summary Message
920 !
930 ! Bit 0 = Hardware Status Register #1 Group Summary Message
940 !
950 !
960 Srq_enab_reg=32+8+1
970 OUTPUT Inst_address;"*SRE";Srq_enab_reg
980 !
990 ! 5) Set up the Active Controller to respond to an SRQ interrupt:
1000 ! Call subprogram Check_interrupt if an SRQ condition exists on select
1010 ! code 7. The interrupt priority level is set to 15 (highest level).
1020 !
1030 ON INTR 7,15 CALL Srvice_interupt
1040 !
1050 ! 6) Enable interrupts on select code 7:
1060 ! The interface mask is set to a value of 2 which enables interrupts on
1070 ! the HP-IB bus when the SRQ line is asserted.
1080 !
1090 ENABLE INTR 7;2
decimal value = 2^5 = 32
decimal value = 2^4 = 16
decimal value = 2^5 = 32
decimal value = 2^3 = 8
decimal value = 2^0 = 1