1269 User Manual
Using The Enhanced Monitoring System 4-9
accepted for this command.
Reading The VXI Bus
Error and IACKn
Counters
The present count of Bus Error (BERR) or Interrupt
Acknowledge cycles (IACKn) may be read back from the EMS.
Only the presently monitored event will return a non-zero count
value; all others will return a count of 0. For example, if the
“SENSE:VXI:IACK3:LIMIT 7" command is received, then the
BERR, IACK1, IACK2, and IACK4 through IACK7 count values
will be returned as zero.
The following queries may be used to read the present count of
VXI Bus Error and Interrupt Acknowledge events.
SENSE:VXI:BERR:COUNT?
-- read BERR count
SENSE:VXI:IACK1:COUNT?
-- read IACK1 count
SENSE:VXI:IACK2:COUNT?
-- read IACK2 count
SENSE:VXI:IACK3:COUNT?
-- read IACK3 count
SENSE:VXI:IACK4:COUNT?
-- read IACK4 count
SENSE:VXI:IACK5:COUNT?
-- read IACK5 count
SENSE:VXI:IACK6:COUNT?
-- read IACK6 count
SENSE:VXI:IACK7:COUNT?
-- read IACK7 count
Clearing The VXI Bus
Error and IACKn
Counters
The present count of Bus Error (BERR) or Interrupt
Acknowledge cycles (IACKn) may be cleared to zero. This is
necessary since the count increases to a maximum value of
256. Once the count reaches 256, the only way to clear it is to
use the command described below (or to select some other
IACKn or BERR line for monitoring).
The following commands may be used to clear the BERR or
IACKn counters:
SENSE:VXI:BERR:CLEAR
-- clear BERR counter
SENSE:VXI:IACK1:CLEAR
-- clear IACK1 counter
SENSE:VXI:IACK2:CLEAR
-- clear IACK2 counter
SENSE:VXI:IACK3:CLEAR
-- clear IACK3 counter
SENSE:VXI:IACK4:CLEAR
-- clear IACK4 counter
SENSE:VXI:IACK5:CLEAR
-- clear IACK5 counter
SENSE:VXI:IACK6:CLEAR
-- clear IACK6 counter
SENSE:VXI:IACK7:CLEAR
-- clear IACK7 counter
This command is meaningful only if the specified event is
presently being monitored. If, for example, the IACK3 line is
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