IBM All-in-One Super7 Single Board Computer PCM-5896 - Manual (Page 49)

Chapter 2 Installation 37
Serial ports (CN16)
The PCM-5896 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.).
COM 1-4 RS-232/422/485 serial ports (CN16)
COM1, COM2, COM3, COM4 RS-232/422/485 serial port
PIN SIGNAL PIN SIGNAL
COM1 1
DCDA 2 DSRA
3 RXDA 4 RTSA
5 TXDA 6 CTSA
7 DTRA 8 RIA
9 GND 10 N.C.
COM2 11 DCDB 12 DSRB
(422TXD-/485DATA-)
13
RXDB 14 RTSB
(422TXD+/485DATA+)
15
TXDB 16 CTSB
(422RXD+)
17
DTRB 18 RIB
(422RXD-)
19
GND 20 N.C.
COM3 21 DCDC 22 DSRC
23 RXDC 24 RTSC
25 TXDC 26 CTSC
27 DTRC 28 RIC/+5V/+12V
29 GND 30 N.C.
COM4 31 DCDD 32 RSRD
33 RXDD 34 RTSD
35 TXDD 36 CTSD
37 DTRD 38 RID/+5V/+12V
39 GND 40 N.C.