SIGMA LBA-708 - Manual (Page 214)

Command Meaning Usage
bit 5 - Event Status bit, ESB, set
whenever an unmasked event status
condition exists (ESR & ESE).
bit 4 - Message Available bit, MAV, set
when a response to a query is available in
the output queue.
bit 3 - Error Message Available bit, EMAV,
set when an error message has been
posted to the error message queue (see
:ERR).
bit 2 - LBA-PC Event Status bit, LSB, set
whenever an unmasked LBA-PC event
status condition exists (ELR & ELE).
bit 1 - unused
bit 0 - unused
All other IEEE 488.2 common commands are not recognized by the LBA-PC and will return a Command
Error.
Operator’s Manual LBA-PC 214