Com1 And Com2 Connector (Cn4) - AXIOMTEK PICO300 User Manual

PICO300 Pico-ITX Board
A.18.3

COM1 and COM2 Connector (CN4)

This is a 2x10-pin connector which is compliant with AMP 2-1734507-0 for COM1 and
COM2 serial port interface. Only COM1 port has +5V level power capability on DCD and
+12V level on RI by setting JP1 (see section A.17.1). If you need COM1 port to support
RS-422 or RS-485, please refer to BIOS setting in section 4.4. The COM2 port supports
only RS-232. The pin assignments of RS-232/422/485 are listed in table below.
Pin RS-232
1 DCD2
2 DSR2
3 RXD2
4 RTS2
5 TXD2
6 CTS2
7 DTR2
8 RI2
9 GND
10 +V5S
11 DCD1
12 DSR1
13 RXD1
14 RTS1
15 TXD1
16 CTS1
17 DTR1
18 RI1
19 GND
20 +V5S
82
RS-422 RS-485
GND GND
+V5S +V5S
TX- Data-
No use No use
TX+ Data+
No use No use
RX+ No use
No use No use
RX- No use
No use No use
GND GND
+V5S +V5S
2
1
I/O Boards (Optional)
20
19