Aaeon PCM-7890 User Manual page 50

All-in-one pentium ii single board computer with lcd, ethernet, audio, & 4 coms
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The PCM-7890 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.).
COM1
COM2 11
COM3
COM4
38 PCM-7890 User Manual
PIN
SIGNAL
1
DCDA
3
RXDA
5
TXDA
7
DTRA
9
GND
DCDB
(422TXD-/485DATA-)
13
RXDB
(422TXD+/485DATA+)
15
TXDB
(422RXD+)
17
DTRB
(422RXD-)
19
GND
21
DCDC
23
RXDC
25
TXDC
27
DTRC
29
GND
31
DCDD
33
RXDD
35
TXDD
37
DTRD
39
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.

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