User Manual

13
3
Connection
This chapter describes how to connect peripherals, switches
and indicators to the PM-1028 board.
3.1 RS-232 Connector
The serial ports are high speed NS16C550 compatible UART
ports with Read/Receive 16 byte FIFO.
•
CN1: COM1 ~ COM4 serial port connectors.
PIN NO DESCRIPTION PIN NO DESCRIPTION
1
DCD (COM4)
2
DSR (COM4)
3
RXD (COM4)
4
RTS (COM4)
5
TXD (COM4)
6
CTX (COM4)
7
DTR (COM4)
8
RI (COM4)
9
GND (COM4)
10
GND (COM4)
11
DCD (COM3)
12
DSR (COM3)
13
RXD (COM3)
14
RTS (COM3)
15
TXD (COM3)
16
CTX (COM3)
17
DTR (COM3)
18
RI (COM3)
19
GND (COM3)
20
GND (COM3)
21
DCD (COM2)
22
DSR (COM2)
23
RXD (COM2)
24
RTS (COM2)
25
TXD (COM2)
26
CTX (COM2)
27
DTR (COM2)
28
RI (COM2)
29
GND (COM2)
30
GND (COM2)
31
DCD (COM1)
32
DSR (COM1)
33
RXD (COM1)
34
RTS (COM1)
35
TXD (COM1)
36
CTX (COM1)
37
DTR (COM1)
38
RI (COM1)
39
GND (COM1)
40
GND (COM1)