B&K Precision 2552-2559 - Programming Manual - Manual (Page 99)

99
ADDITIONAL INFORMATION
Status Byte Register (STB)
Bit Bit Value Bit Name Description Note
7 128 DIO7 0 reserved for future use
6 64 MSS/RQS
MSS=1
RQS=1 at least 1 bit in STB masked by SRE is 1
service is
requested
(1)
(2)
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 (5)
1 2 DIO1 0 reserved
0 1 INB 1 an enabled INternal state change has
occurred
(6)
Notes
(1) The Master Summary Status (MSS) indicates that the instrument requests service, whilst 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 an *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 an 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 the nearest legal value. For instance, the VAB bit would be set if the timebase is
redefined as 2 μs/div since the adapted value is 2.5 μs/div.
(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.