Experimental Physics and
Industrial Control System

Hello,

I am having a Modbus interface, I have disabled polling and I am using MODBUS_READ as a trigger. An ai record  "myData" (with SCAN as "I/O Intr" which holds the data received over Modbus.

sseq is used to give start of conversion and check for EOC and send MODBUS_READ and wait for myData to be processed (by checking busy record). In short I am using the sseq record in sscan as a detector trigger.

I am using a sscan along with sseq records for triggering and acquiring the data over Modbus. To synchronise the detectors MODBUS_READ command (I am using busy record) and on processing of myData record (I am using myData.FLNK to trigger a bo record to reset the busy record). the sseq record is waiting on this busy before sscan record acquires the detector data.

I am always getting N-1th sample instead of the Nth sample. However if I give sufficiently long detector delay time ie of 1-2 sec I am receiving proper data. I am not happy with this workaround

What am I doing wrong?

Thank you in advance

Regards,

Kuldeep