Specifications

Bit 4 (MAV)
bit value 16
10
There is a message available in the Output Queue. Execute
the appropriate query command.
Bit 5 (ESB)
bit value 32
10
Read the Standard Event Group’s Event Register using the
*ESR? command. This will return bit values for events
which have occurred in this group. After reading, this
status register is cleared.
Note that bits 2 through 5 in this group indicate error
conditions. If any of these bits are set, error messages will
be found in the Error Queue. Use the SYST:ERR?
command to read these.
Bit 7 (OPR)
bit value 128
10
Read the Operation Status Group’s Event Register using
the STAT:OPER:EVENT? command. This will return bit
values for events which have occurred in this group. After
reading, the Event Register is cleared.
Clearing the Enable
Registers
To clear the Enable Registers execute:
STAT:PRESET for Operation Status and
Questionable Data Groups
*ESE 0 for the Standard Event Group
*SRE 0 for the Status Byte Group
The Status Byte
Group’s Enable
Register
The Enable Register for the Status Byte Group has a special purpose. Notice in
Figure 3-12 how the Status Byte Summary bit wraps back around to the Status
Byte. The summary bit sets the RQS (request service) bit in the Status Byte. Using
this Summary bit (and those from the other status groups) the Status Byte can be
polled and the RQS bit checked to determine if there are any status conditions
which need attention. In this way the RQS bit is like the GPIB’s SRQ (Service
Request) line. The difference is that while executing a GPIB serial poll (SPOLL)
releases the SRQ line, executing the *STB? command does not clear the RQS bit in
the Status Byte. The Event Register must be read of the group whose summary bit
is causing the RQS.
Reading Status
Groups Directly
It is possible to directly poll status groups for instrument status rather than poll the
Status Byte for summary information.
Programming the VT1419A Multifunction
Plus
Using the Status System
Chapter 3 93
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