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The *SRE? query returns the current contents of the Service Request En-
Query Response
able Register.
*STB? (Status Byte)
Returns the current value of the instrument's Status Byte.
The master summary status (MSS) bit 6 indicates whether or not the device
has at least one reason for requesting service.
This will not change the Status Byte register. The response value is an integer,
to be interpreted as a binary number, representing the bit values of the regis-
ter. Performing a serial poll on the instrument also reads the Status Byte regis-
ter, except that bit 6 indicates whether there is a service request that has not
been serviced. The most convenient way to clear the Status Byte register is to
send a *CLS command. The Status Byte register summarizes the states of the
other register sets. It is also responsible for generating service requests.
Bit
7
6
5
4
3
2
1
0
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Bit Weight
Bit Name
Condition
128
OPER
0 = no enabled operation status conditions have occurred
1 = an enabled operation status condition has occurred
64
RQS/MSS
0 = WDCA has no reason for service
1 = WDCA is requesting service
32
ESB
0 = no event status conditions have occurred
1 = an enabled event status condition occurred
16
MAV
0 = no output messages are ready
1 = an output message is ready
8
—
0 = not used
4
MSG
0 = no message has been displayed
1 = message has been displayed
2
USR
0 = no enabled user event conditions have occurred
1 = an enabled user event condition has occurred
1
TRG
0 = no trigger has occurred
1 = a trigger occurred
0 = False = Low
1 = True = High
Programming Commands
Common Commands
6-23
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