issue of timeout for the fpga 9870

I'm collecting series instrument (read-only) data, instrument using 115200 baud, 8 bits, no parity 1 stop and no control flow, none of which are configurable.

It works generally fine but sometimes it starting delay, by examining the properties of port, it says 0 bytes available there, but the instrument is always sending bytes. Disconnect the cable series and reconnecting gets it going again... But why?

I detect and recover with happiness (framing, etc) communication errors, but I can't get anything to recover from occurrence of timeout exception of physical intervention.

If I only connect the instrument and the start (forcing a real timeout) and plug in the unit, it will always be fortunately seems to start.

At this point, I would be 'reset' the port on a timeout, but I can't find a method/technique to do so.

It is a 9014 with 9114 chassis module 9870 (among others) and a labview 11 sp1

Eric416,

I had a 9870 running in a cRIO-9074 (scan mode) for some time now without any problems.  I think I'd still try the isolator just to eliminate the posibility of equipment short.  Then I hang a noculars on the TX/RX and see what kinds of things are spend on start-up/power.  Have you tried to have your code close, then reopen the VISA session when the time-out occurs?

Tags: NI Software

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