GPIB Status LEDs
The six GPIB Sta tus LEDs shown in Fig ure 30 in di cate the cur rent sta tus
of the GPIB bus. When an LED is il lu mi nated, the sta tus in di cated is as
follows:
§
SRQ (SRQ interrupt)
The instrument has asserted the SRQ line in order to request service
from the GPIB controller.
§
GPIB
The instrument is under the control of the GPIB interface, set by the
control mode switch. The APIB connector will be driven internally by
the instrument GPIB interface board.
§
TA (Talk Addressed)
The instrument is talk addressed by the GPIB controller.
§
LA (Listen Addressed)
The instrument is listen addressed by the GPIB controller.
§
MAV
The instrument has one or more bytes in the output queue and has
asserted the MAV (Message AVailable) bit in the Status Byte Register.
§
ERR
The instrument has detected an error condition that has not been
reported to the system controller. This LED goes off when the error
condition has been reported in response to the :ERRM? or :ERRS?
error queries.
GPIB Program Message Terminators
When the in stru ment is ad dressed as a lis tener, two pro gram mes sage
ter mi na tors (PMT) are sup ported:
The GPIB Software Development Process Chapter 7: GPIB Configuration
Getting Started with ATS-2 67
ERR
MAV
LA
TA
SRQ
GPIB
GPIB
IEEE-488.2 (GPIB)
4
0
1
2 18 16
APIB
ADDRESS
RL1, PP0, DC1, DT1, C0, E2
SH1, AH1, T6, TE0, L4, LE0, SR1,
Figure 30. ATS-2 GPIB Option panel:
Address Switch, Status LEDs and GPIB port.
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