4115T Light Duty Industrial PC Chapter 3 – POS-478 CPU Control Board and BIOS Setup
24 143926(A)
COM2 supports three modes: RS-232, RS-422, RS-485 (For 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
RS-485 Mode
PIN Description PIN Description
1 RTX-
6 NC
2 RTX+
7 NC
3 NC
8 NC
4 NC
9 Voltage
5 NC
Keyboard / Mouse Connector
POS-478 provides one keyboard and one mouse header connector, one external
keyboard & Mouse connector.
CN23A (Purple): Extended Keyboard 6-pin Mini Din Connector
PIN Description
1 KB
DATA
2 NC
3 GND
4 VCC
5 KB
CLOCK
6 NC