Serial Ports Com2 To Com4 - Beckhoff CB1056 Manual

Internal Connectors

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,
mating connector FCI 71600-610LF). Signals are RS232.
The port address and the interrupt are set via the BIOS setup.
Pinout COM connector:
Description
data carrier detect
receive data
transmit data
data terminal ready
ground
Beckhoff New Automation Technology CB1056
Name Pin
DCD 1
RXD 3
TXD 5
DTR 7
GND 9
Name
2 DSR
4 RTS
6 CTS
8 RI
10 VCC
Chapter: Connectors
Description
data set ready
request to send
clear to send
ring indicator
5 volt supply
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