LinuxCNC, modbus and VFDs
- claytonlouden
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18 Jan 2015 21:56 #55140
by claytonlouden
LinuxCNC, modbus and VFDs was created by claytonlouden
Hi everyone,
I've been trying to get LinuxCNC to talk to one of my VFDs via modbus without success. At this point, I'd like to rule out the rs485 to usb adapters I've been using (a cheap Chinese one from ebay and a digitus one from amazon, neither works with the altivar VFD nor with the Hitachi WJ200). Does anybody have an rs485 adapter, either USB or plain old RS232, running with LinuxCNC? I'd like to get one that is known to work, so any pointers would be greatly appreciated.
Cheers, Clayton
I've been trying to get LinuxCNC to talk to one of my VFDs via modbus without success. At this point, I'd like to rule out the rs485 to usb adapters I've been using (a cheap Chinese one from ebay and a digitus one from amazon, neither works with the altivar VFD nor with the Hitachi WJ200). Does anybody have an rs485 adapter, either USB or plain old RS232, running with LinuxCNC? I'd like to get one that is known to work, so any pointers would be greatly appreciated.
Cheers, Clayton
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18 Jan 2015 22:31 #55141
by BigJohnT
Replied by BigJohnT on topic LinuxCNC, modbus and VFDs
I use the one that came with my GS2 VFD and it uses the serial port.
JT
JT
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09 Mar 2015 17:53 #56560
by claytonlouden
Replied by claytonlouden on topic LinuxCNC, modbus and VFDs
That was the hint I needed, thank you so much! I can only assume why the modbus<->usb converter didn't work (maybe it didn't respect RTS/CTS) but I got a cheap modbus<-> RS232 converter from ebay and it just works. Shipping it from Hongkong too forever though.
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