INFICON XTM/2 Thin Film Deposition Monitor - Manual (Page 84)

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XTM/2 Operating Manual
To implement serial polling of the Request for Service bit you need only test for
the RQS bit to be set.
For example:
(serial poll) CALL IBRSP (XTM2%,SPR%)
B = SPR% / 64 : B = INT(B)
IF B = 1 THEN (continue prog) ELSE (serial poll)
If the RQS bit is set, the program may then be made to read the first 4 bits of
the Status Byte (2^0 through 2^3) to determine which event generated the
service request. Once this is determined the appropriate action may be taken.