I am trying to use SignalExpress to acquire data from multiple sources, and I created a user-defined step in LabVIEW 8 for SignalExpress to use. This VI acquires data from a thermistor that has an infrared-RS232 (9 pin) adapter, which in turns plugs into an RS232-USB converter cable (because my laptop does not have a 9-pin RS232 port). However, when I try running the step, I am getting an error in SignalExpress that saysPossible reason(s):VISA: (Hex 0xBFFF006B) A framing error occurred during transferand occasionally I also get an error message suggesting an I/O error. There was one attempt at running my project when data was properly transmitted every other time (my device outputs every three seconds), so I'm kind of confused...The VI itself works fine in LabVIEW; I've never gotten any errors when I run it in LabVIEW. Following the information I found in a forum search (this seems to be a very common problem!) and a KB article, I checked the port settings (baud rate, number of data bits, parity, flow control, and number of stop bits) in MAX and what I specified in my VI, and they match my device's port settings specs. I closed other programs that might have been using the COM port. In MAX, I also performed a test panel and it seems to be transmitting something, although when I select "ASCII" only (which is what my device outputs), the reading is just a bunch of elipses and X's, which isn't what I would expect, but then again I'm a student and don't have a lot of experience with this stuff. I'm not really sure what's going on, if my VI seems to work perfectly in LabVIEW and problems arise only when it's imported into SignalExpress. I wonder if the problem could be noise due to a long cable (the infrared-RS232 adapter that I ordered with the thermistor is several feet long) and/or a cheap RS232-USB converter cable that I just bought at a local store. Or maybe there is too much EM radiation in my room (what kind of appliances would cause interference? Refrigerators? Stereo system?) As extra info, I also programmed a kind of wait in my VI to not read my selected COM port until Number of Bytes at Serial Port is more than 0 (because this will be a continuosuly running step in SignalExpress and there will only be a temperature output every 3 seconds); maybe there are some timing issues involved with that? Any other ideas? This is a student project and I'm hoping to, uh, finish it on time. Thanks!Message Edited by hyenah on 05-19-2007 01:59 PMMessage Edited by hyenah on 05-19-2007 02:01 PM

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Home Community Discussion Forums Most Active Hardware Boards Instrument Control (GPIB, Serial, VISA, IVI) Topic

Instrument Control (GPIB, Serial, VISA, IVI)

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RS-232 framing error and I/O error

Re: Re : Re: RS-232 framing error and I/O error

hyenah

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‎05-22-2007 03:59 PM

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Never mind -- I just used the "Number of Bytes" as both the case selector and the criterion to stop the while loop. Thank you so much for your help! It seems to be working the way I want it to now.

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