User`s manual

124 Chapter 6
O:\Manuals\E6380A_Progguid\Book\Advoper.fm
Advanced Operations
Status Reporting
Table 6-1 details the Status Byte Register bit assignments and their
associated meaning.
The Status Byte Register is unique in that bit 6 can take on two
different meanings. The contents of the Status Byte Register can be
read two ways: by using a serial poll, or by using the *STB? Common
Command. Both methods return the status byte message, bits 0-5, and
bit 7, as defined in Table 6-1. The value sent for bit 6 is, however,
dependent upon the method used.
Table 6-1 Status Byte Register Bit Assignments
Bit
Number
Binary
Weighting
Condition Comment
7 128 Operation Status Register Group
Summary Message
1= one or more of the enabled
events have occurred since the
last reading or clearing of the
Event Register
6 64 Request Service (RQS) when read
by serial poll OR Master
Summary Status message when
read by *STB? command
1= Test Set has requested service
OR
1= one or more of the enabled
service request conditions is true
5 32 Standard Event Status Bit (ESB)
Summary Message
1= one or more of the enabled
events have occurred since the
last reading or clearing of the
Event Register
4 16 Output Queue Message Available
(MAV) Summary Message
1= information is available in the
Output Queue
3 8 Questionable Data/Signal
Register Group Summary
Message
1= one or more of the enabled
events have occurred since the
last reading or clearing of the
Event Register
2 4 Unused in Test Set
1 2 Hardware #2 Status Register
Group Summary Message
1 = one or more of the enabled
events have occurred since the
last reading or clearing of the
Event Register
0 1 Hardware #1 Status Register
Group Summary Message
1 = one or more of the enabled
events have occurred since the
last reading or clearing of the
Event Register