T o u c h P a n e l P C A H P - 2 1 5 3Chapter 2 Quick Installation Guide 2 - 42.2 COM1/2 RS-232/422/485 Serial Port ConnectorCOM1 (D-sub 9 male)Pin 2 B Signal Pin 3 B Signal1 DCD 2 RXD3 TXD 4 DTR5 GND 6 DSR7 RTS 8 CTS9 RICOM2 RS-232/422/485 (D-sub 9 male)Pin Signal Pin Signal1 DCD(422TXD-/485DATA-) 2 RXD (422RXD+)3 TXD(422TXD+/485DATA+) 4 DTR (422RXD-)5 GND 6 DSR7 RTS 8 CTS9 RI/+5Volt/+12Volt12 4567 8912 4567 89