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The mainboard 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
13
15
17
19
COM3 21
23
25
27
29
COM4 31
33
35
37
39
36 PCM-5894/5892 User Manual
SIGNAL
DCDA
RXDA
TXDA
DTRA
GND
DCDB
(422TXD-/485DATA-)
RXDB
(422TXD+/485DATA+)
TXDB
(422RXD+)
DTRB
(422RXD-)
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.
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