... connected: 4pcs 4.Network Communication via RS232 / RS485 NS-M400 Four-door RS232/RS485 Network Access Control Board Nordson ... Distance between ControllersRS232: Communication Distance less than 13m, suggestion distance is 3m or less RS485: bus line max ... coverage areaCollocationsPCB board, case, power, power line, serial port communication line, software, manual, certificate, key(2pcs), cartonAlarm for ...