Status Register System
2500A Series Operation Manual, 34172 Revision C, March 2008
3.5 Status Register System
The Status Register System provides information regarding the state of the 2500A during remote opera-
tion. Several status registers can be queried to provide specific information regarding the state of the
instrument or the status of events relating to its operation. These registers can be queried directly or can
be configured to initiate a service request whenever an expected condition has occurred. One or more
conditions can be monitored at one time by the 2500A.
Figure 3-1 shows the interrelationship between the registers that constitute the 2500A Status Register
System.
Figure 3-1: Status Register System
The following paragraphs briefly describe the registers:
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
&
&
&
&
&
&
&
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
&
&
&
&
&
&
&
&
Local Control
not used
not used
Error/Event
MAV
RQS/MSS
OR
Power-On Occurance
not used
not used
not used
Execution Error
Command Error
Query Error
Operation Complete
8
9
10
11
12
13
14
15
Synth Unlocked
not used
ALC Unleveled
not used
not used
not used
not used
No External Reference
0
1
2
3
4
5
6
7
not used
not used
not used
not used
not used
not used
not used
not used
Standard Event
Status Register
(ESR)
Status Byte
Register
(STB)
Standard Event
Status Enable
Register (ESE)
Service Request
Enable Register
(SRE)
Questionable
Status Condition
Register
OR
8
9
10
11
12
13
14
15
0
1
2
3
4
5
6
7
&
&
&
&
&
&
&
&
&
&
&
&
&
&
&
&
OR
Questionable
Status Enable
Register
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