Bristol 428 - Page 45

Model 428 User’s Manual REMOTE COMMUNICATIONS
Bristol Instruments, Inc. 45
*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 software
version and will reflect the actual version number.
Query Response
BRISTOL WAVELENGTH METER, 428A, 1109, 0.79
*OPC?
Description
The *OPC (operation complete) query returns a one (1) when all
pending device operations are complete.
Query Response
{0 | 1}
*RCL
Description
The *RCL (recall) command restores instrument settings. It is the same
as using the Recall Settings function through the display.
*RST
Description
The *RST (reset) command returns the instrument’s settings to a known
state.