Hello Alexander,
Unfortunatly serial comms is something that no one has ever got to work with this controller. I have managed to make it work with some V350s I was setting up before, but this older V570 left over from an older project was one where the people originally working with it only ever managed to get working with Ethernet. Its not helping that I need to use a Serial via USB adaptor, as that adds an extra layer of potential problems on the situation. Fewer and fewer computers come with built in serial now, I would love it if all the controllers worked directly via usb! (baud rate checked, RS232/RS485 checked, cable is a 4 wire RJ11, drivers for usb/serial updated, using port1)
Realistically I have spent too much time on this allready, it could just be down to a faulty/incorrectly installed USB/Serial converter, but I am going to have to knock it on the head. When the project goes ahead, I will have to buy a new PLC.
Thanks for your help though