Bristol 871A - Page 44

Model 871A User’s Manual REMOTE COMMUNICATIONS
Bristol Instruments, Inc. 44
*ESR?
Description
The *ESR (event status register) query returns a value which encodes
the bits in the event status register. If any bits are set in the ESR, then
the ESR summary bit will be set in the STB.
Query Response
Returns an integer which is the sum of all the bit values for those bits
that are set. See Event Status Register table below.
Event Status Register
BIT
BIT VALUE
CONDITION
7
128
Power On (PON)
6
64
Not Used
5
32
Command Error (CME)
4
16
Execution Error (EXE)
3
8
Device Dependent Error (DDE)
2
4
Query Error (QYE)
1
2
Not Used
0
1
Operation Complete (OPC)
*IDN?
Description
The *IDN (identification number) query returns a string value which
contains the instrument type, serial number, and firmware version. The
third value is the instrument serial number. The last value is the
imbedded software version.
Query Response
BRISTOL WAVELENGTH METER, 871A-VIS, 1135, 1.03