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Good Evening All,
It has been a long time since I partipated in this forum in other than an observing capacity, but I have run into a wall on this one. My customer builds a device that communicates over an RS 485 connection. I am trying to build a LabVIEW test program for them and have run into some real problems that I haven't resolved. I am able to talk to this device OK, using MARK/SPACE parity
settings in my VISA Serial Write call (as suggested on the NI site), but when trying to receive from the device I am rarely getting a good communication, getting "parity errors" and "framing errors" most of the time. The transmitted protocol from the device is 8 bits with SPACE parity set, so the "parity bit" received should always be 0. I have tried masking the returned error (just ignoring it in later VI's) but no luck, still only get garbled stuff, except on rare occasions. Hooked up to a VC++ based program it communicates OK, but I don't know what they did inside that program. Any ideas for a "road warrior" 1100 km from home living out of a laptop bag? Win XP LabVIEW 6.1
Thanks, as always, and happy wiring!
Putnam Monroe
Senior Engineer Summit Technology |
