rs232 USB problem

Hello world

I've been in vain looking for a solution to a problem that I seem to have with standard equipment communication using a converter USB to rs232.

I'm using Labview 2013 on a windows 7 computer and using a converter using the FTDI chip.  My computer recognizese converter and NOR-MAX recognizes as ASRL7::INSTR that I named "pc830."  I've attached a screenshot of my VI.

I am tempted to write a command in a pc830 (p) 169 170 order of read/write ASCII) asking a piston position data. The problem I encounter is that, while I can send a command, I'm not receiving all data during the reading of my program and my connection time part (error-1073807339 occurred to read in PC830PosVelExtractor.vi VISA, VISA: (Hex 0xBFFF0015) timeout expired before the operation ended.).

The first and obvious questions are if the serial port settings I use are correct.  I'm essentially rewriting of a previous Labview program that allow to control this piston even.  I took (and verified) that these are the correct values (baud rate, stop bit, etc.).  In addition, this old program sending the \02255\sR\s10034:96\r message takes up a replica of the equipment of series with the position data (for example \02V26057:148\r).  I checked that the hexagonal version of the message sent by my new program is the same as the old.

Now, to check that the USB cable works in fact, I did a loopback test by opening a window to test VISA.  In this regard, bypassing the cable in a rs232 configuration, I'm able to successfully send and receive this same order of \02255\sR\s10034:96\r.  I got a timeout issue before, however, I activated the terminal character, and he went.  The message is sent and received without problem.

Back to my program, I activated the same way the terminal character (\r) from the serial port hoping to get rid of the question.  When it is connected to my standard equipment, I always get the question of timeout during playback.  However, if I short the cable once again in a rs232 loopback configuration, I can send and receive my \02255\sR\s10034:96\r message without problem.

I actually connected the old and the new program the cable just to see that I could talk with other devices.  It works very well, and I may as well read and write in both directions of each programs.

My last attempt to diagnose/difficulty of the question was to add a "hunt read buffer" just before you perform the write operation.  It didn't matter, because as far as I know.

I would like to hear from someone with suggestions that I am just about ideas at this stage.  We have no space to add a serial port of the computer, and converters with FTDI chips reviews seem to be good.  How can I get this thing to talk!


Tags: NI Hardware

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