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4-13
Remote Operation
Monitoring the Instrument
The
STATus:PRESet
command clears all event registers and sets all bits in the
event enable registers. Use the
*CLS
common command to clear all event regis-
ters and all queues except the output queue. If
*CLS
is sent immediately fol-
lowing a program message terminator, the output queue is also cleared. In
addition, the request for the
*OPC
bit is also cleared.
For an example program using the status registers, refer to “Example 9. Moni-
toring the status registers” on page 4-29.
Status Byte
The Status Byte contains summary bits that monitor activity in the other sta-
tus registers and queues. The register’s bits are set and cleared by summary
bits from other registers or queues. If a bit in the Status Byte goes high, query
the value of the source register to determine the cause.
Command Use
HP-IB serial poll command Returns the status byte value. Reads bit 6 as the
Request Service (RQS) bit and clears the bit
which clears the SRQ interrupt.
*STB?
common command Returns the status byte value. Reads bit 6 as the
Master Summary Status (MSS) and does not
clear the bit or have any effect on the SRQ inter-
rupt.
*SRE
common command Sets or reads the event enable register value
(mask).
Standard Status Structure
The Standard Status Structure monitors the following instrument status
events: operation complete, query error, device dependent error, execution
error, and command error. When one of these events occurs, the event sets
the corresponding bit in the register.
Command Use
*ESR?
common command Returns and clears the value of the event regis-
ter.
*OPC
common command When all operations have finished, sets bit 0 of
the event register. The query returns a 1 when
all operations have finished.
*ESE
common command Sets or returns the value of the event enable reg-
ister (mask).
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