
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
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