Chapter:
Connectors
Internal Connectors
page 32
Beckhoff New Automation Technology
CB1052
3.4.2 Serial ports COM2 to COM4
The three serial ports COM2 to COM4 are made available via a 2x5 pin connector each (FCI 75869-
301LF). According to the product order, TTL level signals or RS232 standard signals are provided.
The port address and the interrupt are set via the BIOS setup.
Pinout COM connector:
Description
Name
Pin
Name
Description
data carrier detect
DCD
1
2
DSR
data set ready
receive data
RXD
3
4
RTS
request to send
transmit data
TXD
5
6
CTS
clear to send
data terminal ready
DTR
7
8
RI
ring indicator
ground
GND
9
10
VCC
5 volt supply
