Technical data

Status Register System
2400 Series Operation Manual, 33237 Revision A, May 2004 3-11
3.5 Status Register System
3.5.1 Status Byte Register
The Status Register System provides information regarding the state of the 2400 during remote oper-
ation. 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 2400.
The primary status register is the Status Byte Register. It is the top-level register used to track changes
in the 2400 state. Lower level registers identified in the Status Byte Register indicate changes in the
2400’s operational, event, and questionable status.
3.5.2 Status Byte Description
0 Local Control. This bit is set whenever the local button is pressed while the source is in
remote operation
1Not Used.
2 Error/Event. This bit is set whenever a SCPI error has occurred.
3 Questionable Status. This bit is set whenever a questionable status condition has occurred.
Additional information regarding this bit is accessed using the QUES:STAT commands.
4 MAV. Message Available. This bit is set whenever a message is available. QUES Status.
5 ESB. Standard Event Status Register. This bit is set whenever a condition defined in the Stan-
dard Event Status Register has occurred. See the Standard Event Status Register description
for details.
6 RQS/MSS. Interrupt Request. This bit is set whenever an event identified by the service
request mask has occurred.
7Not used. Always 0
7 6 5 4 3 2 1 0
Not used RQS/MSS ESB MAV QUES
Status
Error/
Event
Not Used Local
Control