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Getting data from a device connected to a COM port

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Dear all, I am experimenting with the commMG.au3 library made available by Martin. I can successfully use the functions _CommSetPort and _CommSeendString to control simple devices linked to a computer. For example, here in our lab we have the device described in this manual: http://www.vici.com/support/tn/tn413.pdf

Following the instructions in the manual and the functions that I mentioned, I can control the device. However, I tried to use the function _CommGetString to read data from the device and I get nothing. Using Hyperterminal I get the info. For example, if you check the manual on the link that I sent, if you type CP the hyperterminal window will display "The position is A", for example. I thought that _CommGetString could be used in a similar fashion. Any thoughts?

Thank you!

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Check that the line termination sequence used by your device (seems to be CR) matches what CommMG expects.

Also, while browsing the manual of the device, I see that every line it sends starts with a NULL byte (0x00) and I wonder if this could be the cause of your issue. Perhaps you need to first wait to receive a Null, then use _CommGetString

Edited by jchd

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