National Instruments GPIB-SCSI-A, Руководство пользователя

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S Mode Functions Chapter 5
GPIB-SCSI-A User Manual 5-102 © National Instruments Corp.
trg - Trigger Specified Device *
Type
:
Bus Management function
Purpose: Use
trg
to trigger the specified device. Refer to your GPIB
device documentation for information on the appropriate time
to trigger your device and what effect the trigger has.
Format:
Bit 7 6 5 4 3 2 1 0
Byte
0 Opcode = D9H
1 GPIB Primary Address Reserved
2 GPIB Secondary Addr. (Opt.) Mode Reserved
3 Reserved
4 Reserved
5 Reserved
Remarks: The argument GPIB Primary Address along with GPIB
Secondary Address indicates the address of the device that the
GPIB-SCSI-A will trigger. To indicate that GPIB Secondary
Address contains a valid device address, Mode must be set to
1.
If this is the first function you call that requires GPIB
Controller capability, and you have not disabled System
Controller capability with
rsc
, the GPIB-SCSI-A sends
Interface Clear (IFC*) to make itself Controller-In-Charge
(CIC). It also asserts Remote Enable.
If you passed control to some other GPIB device, control must
be passed back to you or you must send IFC to make yourself
CIC before making this call. Otherwise, the GPIB-SCSI-A
aborts the command, issues a CHECK CONDITION status
response, and sets the Sense Key to ERROR.