Agilent Technologies ESA-E Series Programmer's Manual page 46

Status Registers
Use Status Registers to Determine the State of Analyzer Events and Condition s
The status byte register contains the following bits :
Figure 2-5
Bit Number
6 5
4
3 2
1
0
*STB ?
Status Byte Register
40848
Bit
Descriptio n
0, 1 These bits are always set to 0 .
2 A 1 in this bit position indicates that the SCPI error queue is not empty. The SCPI error
queue contains at least one error message.
3 A 1 in this bit position indicates that the questionable status summary bit has been set .
The questionable status event register can then be read to determine the specific
condition that caused this bit to be set .
4 A 1 in this bit position indicates that the analyzer has data ready in the output queue .
There are no lower status groups that provide input to this bit .
5 A 1 in this bit position indicates that the standard event status summary bit has bee n
set . The standard event status register can then be read to determine the specific event
that caused this bit to be set .
6 A 1 in this bit position indicates that the analyzer has at least one reason to report a
status change. This bit is also called the master summary status bit (MSS) .
7 A 1 in this bit position indicates that the operation status summary bit has been set . The
operation status event register can then be read to determine the specific event tha t
caused this bit to be set.
To query the status byte register, send the
*STB
command. The
response will be the
decimal
sum of the bits that are set to 1 . For
example, if bit number 7 and bit number 3 are set to 1, the decimal su m
of the 2 bits is 128 plus 8 . So the decimal value 136 is returned.
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Chapter2