6.4.1 Interface Commands 109
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SRE Service Request Enable Register Command
Input SRE <bit weighting>[term]
Format nnn
Remarks Each bit has a bit weighting and represents the enable/disable mask of the corre-
sponding status flag bit in the Status Byte Register. To enable a status flag bit, send
the command
SRE with the sum of the bit weighting for each desired bit. Refer to
section 6.2.6 for a list of status flags.
Example To enable status flags 4, 5, and 7, send the command SRE 208[term]. 208 is the sum
of the bit weighting for each bit.
SRE? Service Request Enable Register Query
Input SRE?[term]
Returned <bit weighting>[term]
Format nnn (Refer to section 6.2.6 for a list of status flags)
STB? Status Byte Query
Input STB?[term]
Returned <bit weighting>[term]
Format nnn
Remarks Acts like a serial poll, but does not reset the register to all zeros. The integer returned
represents the sum of the bit weighting of the status flag bits that are set in the Status
Byte Register. Refer to
section 6.2.6 for a list of status flags.
TST? Self-Test Query
Input TST?[term]
Returned <status>[term]
Format n
<status> 0 = no errors found, 1 = errors found
Remarks The Model 335 reports status based on the test done at power up.
WAI Wait-to-Continue Command
Input WAI[term]
Remarks Causes the IEEE-488 interface to hold off until all pending operations have been com-
pleted. This is the same function as the OPC command, except that it does not set
the Operation Complete event bit in the Event Status Register.
Bit Bit Weighting Event Name
4 16 MAV
5 64 ESB
7 128 OSB
To t a l : 208
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