
Event Status Register
Service Request
Enable Register
Bit Definitions
Note
HP
16518
Programming Reference
The Event Status Register is a 488.2 defined register. The bits in this
register are “latched.” That is, once an event happens which sets a bit, that
bit will only be cleared if the register is read.
The Service Request Enable Register is an
register. Each bit enables
the corresponding bit in the status byte to cause a service request. The
sixth bit does not logically exist and is always returned as a zero. To read
and write to this register use the *SRE? and *SRE commands.
The following mnemonics are used in figure B-l and in the “Common
Commands” chapter:
MAV message available.
Indicates whether there is a response in the
output queue.
ESB event status bit.
Indicates if any of the conditions in the Standard
Event Status Register are set and enabled.
MSS master summary status.
Indicates whether the device has a reason
for requesting service. This bit is returned for the
query.
RQS
request
service. Indicates if the device is requesting service. This
bit is returned during a serial poll. RQS will be set to 0 after being read
via a serial poll (MSS is not reset by *STB?).
MSG
message.
Indicates whether there is a message in the message
queue.
PON
power on.
Indicates power has been turned
on.
URQ user request.
Always 0 on the HP
CME command
error. Indicates whether the parser detected an error.
The error numbers and/or strings for CME, EXE, DDE, and
can be
read from a device defined queue (which is not part of 488.2) with the
query :SYSTEM:ERROR?.
Status Reporting
B-3
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