Experimental Physics and Industrial Control System
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Hi Daniel,
Add these two lines in your startup script or type them in the EPICS shell:
asynSetTraceMask("your-asyn-port",-1,0xff)
asynSetTraceIOMask("your-asyn-port ",-1,0xff)
And you will see what is really going on. Post more debugging messages so that other people probably can help you figure out the issue.
Good luck!
Yong
From: Tech-talk <tech-talk-bounces at aps.anl.gov> on behalf of "tech-talk at aps.anl.gov" <tech-talk at aps.anl.gov>
Reply-To: Daniel Cuneo <dpcuneo at lbl.gov>
Date: Monday, July 20, 2020 at 6:08 PM
To: "tech-talk at aps.anl.gov" <tech-talk at aps.anl.gov>
Subject: TCP to LabVIEW TCP VI using Stream Device.
Hello all,
My co-worker has setup a TCP virtual interface in LabVIEW, that allows me to send commands
as strings of text, and get replies with data.
Testing in a Linux shell using netcat (nc on CentOS 7) works well.
echo "foobar\r" | nc -h hex.dump labview-host.foo.bar
However, when I attempt to use Stream / Asyn, I get only timeouts.
Stream and asynOctetWriteRead() both timeout.
One would usually suspect that the line terminators are incorrect. To test line terminators, I turned on the netcat hexdump and can see both a CR and LF (0xD 0xA) being sent in a working netcat test. I put both in my stream protocol file
and hard coded when using asynOctetWriteRead.
I'm beginning to wonder if there's a protocol difference between what netcat does and what a generic TCP connection does.
Does anyone have advice on what else I can try to tease out the problem ?
--
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- Replies:
- Re: TCP to LabVIEW TCP VI using Stream Device. Mark Rivers via Tech-talk
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ANJ, 20 Jul 2020 |
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