20 Hardware InformationSerial Port Connectors - RS-232 (COM2~6)Pin # Signal Function1 DCD Data Carrier Detect2 DSR Data Set Ready3 RXD Receive Data4 RTS Request to Send5 TXD Transmit Data6 CTS Clear to Send7 DTR Data Terminal Ready8 RI Ring Indicate9 GND Ground10 NC KeySerial Port Connector - RS-422/485 (COM6)1 29 101 29 10See "COM6 Mode Jumper Settings (JSETCOM6)" on page 24.Pin # RS-422 RS-4851 TX- DATA-2 N/A N/A3 TX+ DATA+4 N/A N/A5 RX+ N/A6 N/A N/A7 RX- N/A8 N/A N/A9 GND GND10 Key Key