AD278A/AD279A PCI MUX Support Guide, June 2006

Peripheral Connections

RS-232 Asynchronous: DB-25

Appendix B

RS-232 Asynchronous: DB-25

This section provides pin diagrams for DB-25 cable.

DB-25 Pin Assignments

Table B-1 lists the DB-25 pin assigments.

DB-25 Software Handshaking (XON/XOFF) Cable

The three-wire cable is sufficient for a terminal, printer, or other DTE (Data Terminal Equipment) devices

configured for software flow control.

Table B-2 lists the pin-out connection between the DB25 adapter and the DB-25 terminal/printer.

Table B-1 DB-25 Pin Assignments

Signal Description DTE Use Pin #

GND Chassis Ground N/A Shell

TXD Transmitted Data Output 2

RXD Received Data Input 3

RTS Request to Send Output 4

CTS Clear to Send Input 5

DSR Data Set Ready Input 6

SG Signal Ground Reference 7

DCD Data Carrier

Detect

Input 8

DTR Data Terminal

Ready

Output 20

RI Ring Indicator Input 22

Table B-2 Simple Terminal/Printer Cable

DB-25 Female (Card End)

DB-25 Male (Peripheral)

Signal Pin Pin Signal

TxD 2 Connected to 3 RxD

RxD 3 Connected to 2 TxD

SG 7 Connected to 7 SG