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Prologix GPIB-USB Controller User Manual

9/15/2009 14

8.16. srq

This command returns the current state of the GPIB SRQ signal. The command returns

‘1’ is SRQ signal is asserted (low) and ‘0’ if the signal is not asserted (high).

SYNTAX: ++srq

MODES AVAILABLE: CONTROLLER

8.17. status

The status command is used to specify the device status byte to be returned when serial

polled by a GPIB controller. If the RQS bit (bit #6) of the status byte is set then the

SRQ signal is asserted (low). After a serial poll, SRQ line is de-asserted and status byte is

set to 0. Status byte is initialized to 0 on power up.

SRQ is also de-asserted and status byte is cleared if DEVICE CLEAR (DCL) message,

or SELECTED DEVICE CLEAR (SDC) message, is received from the GPIB

controller.

If the command is issued without any arguments it returns the currently specified status

byte.

SYNTAX: ++status [0-255]

MODES AVAILABLE: DEVICE

EXAMPLE:

++status 48 Specify serial poll status byte as 48. Since bit #6 is set, this

command will assert SRQ.

++status Query current serial poll status byte.

8.18. trg

This command issues Group Execute Trigger GPIB command to devices at the

specified addresses. Up to 15 addresses maybe specified. Addresses must be separated by

spaces. If no address is specified then Group Execute Trigger command is issued to the

currently addressed instrument (as set by a previous ++addr command). Refer to the

programming manual for a specific instrument’s response to Group Execute Trigger

command.

SYNTAX: ++trg [<PAD1> [<SAD1>] <PAD2> [SAD2] … <PAD15> [<SAD15>]]

MODES AVAILABLE: CONTROLLER

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Prologix GPIB-USB Controller Manuel d'utilisateur Page 14