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Appendix B: Using the GPIB Interface
*SRE
Syntax:
Example:
*STB? (Query Only)
Syntax:
Example:
B–8
The *SRE (Service Request Enable) command sets the bits in the Service
Request Enable Register (SRER). The Preselector asserts the SRQ line on the
GPIB if it detects a hardware error and *SRE was used as in the example. It will
assert the SRQ line until the controller performs a serial poll or the fault is
corrected. For more information about this command, refer to the Parallel Poll
section in the ANSI/IEEE Std 488.2–1987 Handbook.
Related commands: *CLS, *ESE, *ESR, *STB.
*SRE<NR1>
*SRE?
<NR1> is an integer value in the range from 0 to 255. Numbers outside this
range will cause the Preselector to operate inconsistently.
The binary bits of the SRER are set according to this value, which represent
conditions listed in the *STB? description that allow the Preselector to assert the
SRQ line. If <NR1> is 0, then the Preselector will never request service (this is
the default condition).
*SRE 1 –
sets the bits in the SRER to 00000001 binary, which allows a
hardware error to assert the SRQ line.
*SRE? –
might return a value of 0, showing that the bits in the SRER have
the binary value 00000000 and that the Preselector will never request service.
*STB? (Read Status Byte) query returns the Status Byte (STB) using the Master
Summary Status (MSS) bit.
Related commands: *CLS, *ESE, *ESR, *SRE.
*STB?
The Preselector status byte contains the following status bits:
Bit set
Meaning
0
Hardware error
1 – 3
Not used
4
MAV (Message available)
5
ESB (Event status bit)
6
RQS (Request service)
7
Not used
*SRB? –
might return the value 65 (binary 01000001). Because bits 0 and 6
are set, the Preselector requests service for a hardware error.
2706 RF Preselector
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