Beckhoff CB4051 Manuel d'utilisateur Page 33

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Serial Interface COM2 Chapter: Connectors
Beckhoff New Automation Technology CB4051 page 33
4.14 Serial Interface COM2
The serial interface is a standard IDC socket connector with a spacing of 2.54 mm. Signals default to
RS232 but can be ordered as TTL level too.
The port address and the interrupt are set via the BIOS setup.
CAUTION
COM 1 & 2 cables are not the same pin orientation and you may damage the COM interface and CPU
attached if you use the incorrect COM cable.
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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