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Chapter: Connectors Serial Interface COM1

page 32 Beckhoff New Automation Technology CB4051

4.13 Serial Interface COM1

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

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 ... 69 70

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Beckhoff CB4051 Manual do Utilizador Página 32