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Desktop PC RT Target communication with host through RS232
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12-18-2013 11:06 PM
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As per your suggestion, I changed the I/O class from Serial Instr to USB-RAW and now the port is available in the dropdown list. I think the pallate which is specific to serial does not work with USB Raw. So configure port does not work with this class. If I right click on Visa Resource i.e RTCOM1 and try to edit the VISA resource, then the following error comes-
"The selected resource needs to be configured through MAX before it can be edited."
Now I think only problem is with settings of the two ports i. e COM1 and RTCOM1.
I am attaching the screen shots of the MAX settings, Front panels of both vis and block diagram of both vis.
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nathand
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12-19-2013 12:09 PM
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Looks to me like there's no driver in the RT operating system to support your USB to serial adapter. The RT operating system only has drivers for a very limited set of hardware. I do not think you'll be able to get this working with your hardware, unless you want to reimplement the USB-to-serial protocol yourself (which will not be easy even if you can get the specification for it). I don't know which serial adapters are supported under RT, but try to find one that is.
AB@17
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12-19-2013 11:02 PM - edited 12-19-2013 11:03 PM
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I have done communication with RT system serial port ,I doubt NI-Serial is installed in your RT system or not,by default COM1 is your resource of serial port.
And add Visa open session in your RT vi with same parameters as in host
AB
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Accepted by topic author RashmiM
nathand
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12-19-2013 11:19 PM
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Installing NI-Serial will not solve the problem. The adapter is an FTDI device. See "Do LabVIEW Real-Time Controllers Support FTDI Devices?" The short answer is no, they don't.
12-20-2013 01:46 AM
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Nathand,
As you said, the USB to serial does not work on NI RT. I replaced the desktop PC which I was using as RT Target with the one which has built in RS232 port and installed the all software again. Now it is working fine. I am able to run a small program to test the read/write port. I may need some more help again when I am going to test the host, desktop and fpga target together.
Thank you very much for your support and others also for their help
Rashmi
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