... to 4 ports RS485/422 converter 1, Plug and play compliant, hot swappable 2, Add 1 to 4 serial ports USB HUB to ... play compliant, hot swappable 2, Add 1 to 4 serial ports 3, Multi-interface RS-485 ... powered- no external power needed on USB to serial models or 5VDC power supply.CommunicationStandard Accord ... FG RS485/422 signal T+,T-, R+, R-Working format Asynchronism, point to point or multi-point Band rate ...