108
HP-IB Programming
IEEE Common Commands
General Remarks
Common Status Information
There are four registers for status information:
•
Status Byte register (STB)
•
Service Request Enable register (SRE)
•
Event Status Register (ESR)
•
Event Status Enable register (ESE)
Two of these are status-registers and two are enable-registers.
These registers conform to the IEEE Standard 488.2-1987. You can
find further descriptions of these registers under *ESE, *ESR?,
*SRE, and *STB?. The following figure shows how the registers
are organized.
* The questionable and operation status commands are described in
section 8.4 “Standard STATUS Commands” on page 118.
Figure 8-1
Common Status 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
&
&
&
&
+
&
&
Operation Complete
Operation Complete
Request Control
Request Control
Query Error
Query Error
Device Dependant Error
Device Dependant Error
Execution Error
Command Error
Command Error
User Request
User Request
Power On
Power On
Operation Complete
Request Control
Query Error
Device Dependant Error
Execution Error
Command Error
User Request
Power On
Questionable Status *
Questionable Status *
Message
Message
Available
Request Service
Request Service
Operation Status *
Operation Status *
Questionable Status *
Message Available
Request Service
Operation Status *
Event Status
Register
Event Status
Enable Register
Status Byte
Service Request
Enable Register
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