Command Reference 8-141
*STB?
Status Byte Query
Reads out the value of the Status Byte. Bit 6 reports the Master Summary Status
bit (MSS), not the Request Service (RQS). The MSS is set if the instrument has
one or more reasons for requesting service.
Returned Format:
<Integer> = the sum (between 0 and 255) of all bits that are true. See table below:
Status Byte Register (1 = true)
Bit Weight Name Condition
7 128 OPR Enabled operation status has occurred.
6 64 MSS Reason for requesting service
5 32 ESB Enabled status event condition has occurred
4 16 MAV An output message is ready
3 8 QUE The quality of the output signal is questionable
2 4 EAV Error available
1 2 Not used
0 1 DREG0 Enabled status device event conditions have
occurred
See also: If you want to read the status byte with the RQS bit, use serial poll.
Complies with standards: IEEE 488.2 1987.
*TRG
Trigger
The trigger command *TRG starts the measurement and places the result in the
output queue.
It is the same as:
:ARM:STARt:LAYer2:IMM; *WAI;:FETCh?
The Trigger command is the device-specific equivalent of the IEEE 488.1 defined
Group Execute Trigger, GET. It has exactly the same effect as a GET after it has
been received, and parsed by the counter.
However, GET is much faster than *TRG, since GET is a hardware signal that does
not have to be parsed by the counter.
Example:
SEND®
:ARM:START:LAY2:SOURCE 8 BUS
SEND®
:INIT:CONT 8 ON
SEND® *TRG
READ¬ +3.2770536E+004
Type of Command:
Aborts all previous measurement commands if not *WAI is used.
Complies with standards: IEEE 488.2 1987.
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