104
Appendix C
Status Reporting System
On this page is a graphical representation of the status reporting system for the
GPIB and RS-232 port communications. Following is a detailed description of
each register and how the bits are set and reset. The interactions between
registers is discussed as well as the generation of a GPIB Service Requests.
C.1
Status Reporting System Flowchart
7 6 5 4 3 2 1 0
7 6 5 4 3 2 1 0
OR
AND
Device Error Bit
Query Error Bit
Register Control Bit (Not Used)
Operation Complete Bit
Execution Error Bit
Command Error Bit
(Not Used) User Request Bit
(Not Used) Power On Bit
7 6 5 4 3 2 1 0
Message Available Bit
Event Status Byte Bit
Service Request Bit
Error Queue Bit
Request for Service
7 6 5 4 3 2 1 0
OR
AND
7 6 5 4 3 2 1 0
OR
AND
Standard Event Status Register
Standard Event Enable Register
*ESR?
*ESE
*ESE?
Status Byte Register
*STB?
Parallel Poll
Enable Register
*PRE
*PRE?
Service Request
Enable Register
*SRE
*SRE?
<IST>
*IST?
IEEE 488.1
Serial Poll Response
IEEE 488.1
Service Request
<SRQ>
7 6 5 4 3 2 1 0
7 6 5 4 3 2 1 0
OR
AND
Not Used
Data Error CH A
Saturated CH A
Over Range CH A
Over Range CH B
Saturated CH B
Data Error CH B
Not Used
Device Event Register
Device Event Enable Register
EVENT?
EVENTEN
EVENTEN?
New Valid Data Available CH B
New Data Available CH B
New Valid Data Available CH A
New Data Available CH A
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