Aaeon PCM-6890 User Manual page 47

The PCM-6890 offers four serial ports, three RS-232 and one RS-
232/422/485. These ports allow you to connect them to serial
devices (mouse, printers, etc.).
PIN
COM1 1
3
5
7
9
COM2 11
(422TXD-/485DATA-)
13
(422RXD+)
15
(422TXD+/485DATA+)
17
(422RXD-)
19
COM3 21
23
25
27
29
COM4 31
33
35
37
39
SIGNAL
DCDa
RXDa
TXDa
DTRa
GND
DCDb
RXDb
TXDb
DTRb
GND
DCDc
RXDc
TXDc
DTRc
GND
DCDd
RXDd
TXDd
DTRd
GND
PIN SIGNAL
2 DSRa
4 RTSa
6 CTSa
8 RIa
10 N.C.
12 DSRb
14 RTSb
16 CTSb
18 RIb
20 N.C.
22 DSRc
24 RTSc
26 CTSc
28 RIc/+5V/+12V
30 N.C.
32 RSRd
34 RTSd
36 CTSd
38 RId/+5V/+12V
40 N.C.
Chapter 2 Installation 35