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Serial Ports COM2 through COM4 Chapter: Connectors

Beckhoff New Automation Technology CB3056 page 29

3.14 Serial Ports COM2 through COM4

There are three more serial interfaces on the board. Of these, COM3 is available through the power

connector (cf. p. 15), or, as an option, through a 2x5pin connector (FCI 98424-G52-10LF). COM2 and

COM4 and made available via a 2x10 pin connector (FCI 98424-G52-20LF). Signal level is RS232.

The port address and the interrupt are set via the BIOS setup.

Description Name Pin Name Description

data carrier detect COM2 DCDB 1 11 DSRB data set ready COM2

receive data COM2 RXDB 2 12 RTSB request to send COM2

transmit data COM2 TXDB 3 13 CTSB clear to send COM2

data terminal ready COM2 DTRB 4 14 RIB ring indicator COM2

ground GND 5 15 COM3.3V 3.3 volt supply

data carrier detect COM4 DCDD 6 16 DSRD data set ready COM4

receive data COM4 RXDD 7 17 RTSD request to send COM4

transmit data COM4 TXDD 8 18 CTSD clear to send COM4

data terminal ready COM4 DTRD 9 19 RID ring indicator COM4

ground GND 10 20 COM3.3V 3.3 volt supply

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Beckhoff CB3056 Bedienungsanleitung Seite 29