Aaeon MB-668 Manual page 15

Quick Installation Guide
Serial Port COM2, COM3 and COM4
Connectors (CN5), (CN19) and (CN20)
The availability of this interface allows connection of serial devices
such as mouse, printer, etc.. Pin definitions as follows:
COM2 RS-232/422/485 (CN5)
Pin Signal
1 CM2-1
2 CM2-2
3 CM2-3
4 CM2-4
5 GND
COM3 RS-232/422/485 (CN19)
Pin Signal
1 DCDA
2 RXDA
3 TXDA
4 DTRA
5 GND
6 DSRA
7 RTSA
8 CTSA
9 RIA
Pin Signal
6 NDSR2
7 NRTS2
8 NCTS2
9 INRI2
10 N/C
Pin Signal
10 ATXD+
11 ATXD-
12 ARXD+
13 ARXD-
14 GND
15 N/C
16 N/C
17 N/C
18 GND
MB-668 Installation Guide 15