I have a Groov RIO that I am trying to communicate to modbus devices via RS485. The Rio sees the usb-RS485 adapter and assigns it \dev\ttySer0. I add that into node red and send coms to the port. I never get an activity send or receive at the adapter. If I plug it in to other devices the adapter works and controls the devices.
The device is a Waveshare USB-RS232/485/TTL adapter. I have used them in several project excellent results on other devices.
Any thoughts or help would be appreciated.