System Commands 5
Bit Value Name Description Note
7 128 DI07 0 Reserved for future use
6 64 MSS/RQS (1)
MSS =1
at least 1 bit In STB masked by SRE is 1
(2)
RQS =1
service is requested
5
32
ESB 1 an ESR enabled event has occurred
(3)
4 16 MAV 1 Output queue Is not empty (4)
3 8 DIO3 0 Reserved
2 4 VAB 1 a command data value has been adapted (s)
1 2 DIO1 0 Reserved
0 1 INB
1 an enabled INternal state change
has occurred.
(6)
Status Byte Register (STB)
Table 8
Notes:
(1) The Master Summary Status (MSS) Indicates that the instrument requests service while the Service Request
status - when set - specifies that the oscilloscope issued a service request. Bit position 6 depends on the
polling method:
Bit 6 = MSS If a *STB? query Is received
= RQS if serial polling Is conducted
(2) Example: If SRE = 10 and STB = 10 then MSS = 1. If SRE = 010 and STB = 100 then MSS=0.
(3) The Event Status Bit (ESB) Indicates whether or not one or more of the enabled IEEE 488.2 events have
occurred since the last reading or clearing of the Standard Event Status Register (ESR). ESB Is set If
enabled event becomes true (1).
(4)
The Message AVailable bit (MAV) Indicates whether or not the Output queue is empty. The MAV summary bit
Is set true (1) whenever a data byte resides In the Output queue,
(5)
The Value Adapted Bit (VAB) is set true (1) whenever a data value in a command has been adapted to
nearest legal value. For instance, the VAB bit would be set If the time base is redefined as 2.5 ~sec/div since
the adapted value Is 2 p.sec/dlv.
(6) The INternal state Bit (INB) Is set true (1) whenever certain enabled Internal states are entered. For further
Information, refer to the INR? query,
137
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