Huanyang VFD RS485 Communication problem
- shipmodeller
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01 Jul 2017 19:06 #95268
by shipmodeller
Huanyang VFD RS485 Communication problem was created by shipmodeller
I have a Huanyang VFD ( Who doesn't ) that I am trying to connect into LinuxCNC Ver 2.7+. I followed the instructions, and appear to be getting signals from LinuxCNC on bootup. Great, except, the Huanyang doesn't appear to be responding, and the program poll times out,. I used an oscilloscope and got a very weird waveform. The data from Linuxcnc looks strong, but the data coming from the VFD looks trashy, and the serial converter isn't picking it up,. I had a spare RS232 to RS422 converter, and tried that, but the results were the same. I purposely kept the comm baud rate slow, at 9600. Will pick that up later if this ever works.
By enabling debug on the hal hy_vfd load, I see a hycomm query = 01 01 03 05 00 00 2c 4f
Then, a query-ret = 8
Response_length_calculated = 8
Waiting for message
WAIT_DATA() comms time out.
So, nothing happens... any ideas??
Also, as a side.. if I am getting this bad juju from the comm channel, why is LinuxCNC allowing me to continue... I would think it would put up some flags and say ... Whoah! ... but that is another side. so, if anyone has ideas... I'd appreciate them
By enabling debug on the hal hy_vfd load, I see a hycomm query = 01 01 03 05 00 00 2c 4f
Then, a query-ret = 8
Response_length_calculated = 8
Waiting for message
WAIT_DATA() comms time out.
So, nothing happens... any ideas??
Also, as a side.. if I am getting this bad juju from the comm channel, why is LinuxCNC allowing me to continue... I would think it would put up some flags and say ... Whoah! ... but that is another side. so, if anyone has ideas... I'd appreciate them
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- shipmodeller
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03 Jul 2017 18:22 #95323
by shipmodeller
Replied by shipmodeller on topic Huanyang VFD RS485 Communication problem
Problem solved: Idiot move.. I had bought a cheap RS485/422 converter .. that was my issue. it should have been a pure 485 converter. Went to the store, bought a different RS232 - RS485 converter.. a true one, and it worked perfectly. Thanks to all that responded... problem solved.
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