COM1:RS232/RS485/RS422;COM2:RS485;COM3:RS232COM1:RS232/RS485/RS422;
COM3:RS232COM1/COM3: RS232/RS485/RS422;
COM2:RS485/RS422COM1/COM3:RS232/RS485/RS422;COM2:RS485COM1:RS232/RS485/RS422;COM2:RS485;COM3:RS232COM1:RS232/RS485/RS422;COM3:RS232COM1:RS232/RS485/RS422;COM2:RS485/RS422;COM3:RS232