User manual

Page 154
IEI
®
Technology, Corp.
PPC-5170GS Flat Panel PC
RS-485 Mode
PIN Description PIN Description
1 RTX- 2 NC
3 RTX+ 4 NC
5 NC 6 NC
7 NC 8 Voltage
9 NC 10 NC
CN20B: Serial Port DB-9 Male Connector (COM2)
COM2 supports three modes: RS-232, RS-422 and RS-485 (via DB-9 Connector).
RS-232 Mode
PIN Description PIN Description
1 DCD 6 DSR
2 RXD 7 RTS
3 TXD 8 CTX
4 DTR 9 RI
5 GND
RS-422 Mode
PIN Description PIN Description
1 TXD- 6 RX-
2 TXD+ 7 RX+
3 NC 8 NC
4 NC 9 Voltage
5 NC