Keysight N1911A

Power Meter Remote Operation 1
N1911A/1912A P-Series Power Meters Programming Guide 83
The status byte enable register (SRE, service request enable) is cleared when you:
– cycle the instrument power.
–execute a *SRE 0 command.
Using *STB? to Read the Status Byte
The *STB? (status byte query) command is similar to a serial poll except it is
processed like any other power meter command. The *STB? command returns the
same result as an IEEE-488 serial poll except that the request service bit
(bit 6) is not cleared if a serial poll has occurred. The *STB? command is not
handled automatically by the IEEE-488 bus interface hardware and the command
is executed only after previous commands have completed. Using the *STB?
command does not clear the status byte summary register.
The Standard Event Register
The standard event register reports the following types of instrument events:
power-on detected, command and syntax errors, command execution errors,
self-test or calibration errors, query errors, or when an overlapped command
completes following a *OPC command. Any or all of these conditions can be
reported in the standard event summary bit through the enable register. You must
write a decimal value using the *ESE (event status enable) command to set the
enable register mask.
Table 1-6 Bit Definitions - Standard Event Register
Bit Number Decimal Value Definition
0 1 Operation Complete
All overlapped commands following an *OPC command have been completed.
1 2 Not Used. (Always set to 0.)
24 Query Error
A query error occurred, refer to error numbers 410 to 440 in the user’s guide.
3 8 Device Error
A device error occurred, refer to error numbers 310 to 350 in the user’s guide.
4 16 Execution Error
An execution error occurred, refer to error numbers 211 to 241 in the user’s guide.