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STATUS BYTE
3-38
Status byte when read by serial poll
*SRE
*SRE?
C0074
e
d
d
e
d
d
e
d
d
e
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0
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<erb>
<mss> <mav>
<hsb> <ssb><csb>
-
<esb>
Status Byte Register
Service Request Enable Register#
Register
Read/Write
Commands
Service
Request
Generation
# Bit 6 in this register ignores data sent by *SRE and always returns 0 in response to
*SRE?
<erb> is a device defined queue summary bit indicating that the error queue is
non-empty.
<rqs> is set by a request for service and is cleared by the poll.
<esb> is the standard event register summary bit.
<mav> is 'message available' indicating that the output queue is non-empty.
<hsb> is 'hardware status' summary bit
<csb> is 'coupling status' summary bit
<ssb> is 'instrument status' summary bit
<rqs>, <esb> and <mav> are defined in IEEE 488.2
<rqs> (request for service) will produce an SRQ at the controller. It is set by a change to
either the Status Byte or the Service Enable Register that results in a New Reason for
Service. It is cleared when <mss> goes FALSE (i.e. no reason for service) or by Serial
Poll.