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06 Jul 2022 16:02 #246729
by andypugh
Thinking about this, I suspect that the reason that you see this and most others, (ncluding myself) do not is that you are using a real serail port, and most installations are using a USB to Modbus converter dongle.
And there is no flow control on those.
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02 Aug 2022 06:52 #248824
by looping
Hello
I received this USB rs485 and it's not working, with or without the 120 ohms resistor on the VFD side. hy_vfd says 8 char received but values are obviously corrupted 0x0E 0x0F 0xE6... and CRC is KO.
For the Rs232 converter, I made a little DB9-M_DB9_F dongle and replicated inside what I had on my Rs232 breakout box (Dtr Rts tied to GND).
It's working fine on my dual boot test PC but not on my dedicated Cnc PC (Motherboard GA-D525TUD)
This confirms what I wrote before : "The more I work on this, the less I understand"
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03 Aug 2022 11:50 #248921
by andypugh
So the USB device also works on the test PC (in Linux with hy_vfd?) and not with the controller PC?
I wonder if the controller PC has a chassis ground connection problem?
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04 Aug 2022 08:44 #249013
by looping
No : the USB doesn't work on both PC.
The Rs232 works only on the test PC.
All tests are with hy_vfd.
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04 Aug 2022 22:48 #249075
by andypugh
If the USB doesn't work with either PC, then perhaps it is something simple, like it not having the address in /dev that you think it has?
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04 Aug 2022 23:10 #249079
by tommylight
Did you add yourself to the "dialout" group?
If you start LinuxCNC from the terminal, do you get access denied or permission denied on the serial port?
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07 Aug 2022 09:25 #249260
by looping
You mean /dev/ttyUSB0 or /dev/ttyUSB1 ?
If the selected device doesn't exist, hy_vfd will exit right after launched.
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