Serial port communication problems

[Dennis_Knutson · Accepted solution]

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Giant Spiders wrote:
I have tried both 0xD and 0xA and neither seems to work.  According to the manual for my device, all messages must us a carriage reurn-line feed as the end-of-line delimiter, which is why I used 0xD.

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You do realize, don't you, that the enable termination character and ther term character itself have nothing at all to do with the data that is sent to the instrument?

What is sent to the instrument is the data in the 'string to write' control and you would need a \r or \n at the end of your command.

[Mark_Yedinak]

Take a look at the Basic Read and Write Example. In the beginning of the VI is a VI to initalize the serial port settings. You can play with those to see what will work. One of the options is to use 7-bit ASCII.

[Giant_Spiders]

Dennis,

Thanks for that info.  I was assuming the termination character was referring to the end-of-line delimiter.  Basic Serial Write and Read puts a \n for you, but I needed a \r and no \n.  That's got it working.  Thanks!

[Redstrat]

Nice catch, Dennis!

[Dennis_Knutson]

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Giant Spiders wrote:

Dennis,

Thanks for that info.  I was assuming the termination character was referring to the end-of-line delimiter.  Basic Serial Write and Read puts a \n for you, but I needed a \r and no \n.  That's got it working.  Thanks!

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You should look at the advanced serial write and read to see how to set it to automatically append a character when doing a write.

[Giant_Spiders]

Thanks, Dennis.  I looked at the Advanced Serial VI and used that as a model.  I now have all my VI's written, and I have perfect communication with my pressure controller.