Copyright © 2010 Future Technology Devices International Limited

25

Document Reference No.: FT_000204

DB9-USB-RS232 Datasheet

Version 1.2

Clearance No.: FTDI# 130

DTE Pin Number

Signal Name

DTE Pin Number

2

RXD = Receive Data

3

3

TXD = Transmit Data

2

4

DTR = Data Terminal Ready

6

5

GND = RS232 signal ground

5

6

DSR = Data Set Ready

4

7

RTS = Request To Send

8

8

CTS = Clear To Send

7

Table B.2 – RS232 DTE to DTE connection with null-modem wiring

Note that the DB9-USB-RS232-M is not a DB9-USB-RS232-F with its pins latterly inverted; there is a

“null-modem” wiring configuration present in the DB9-USB-RS232-M module. This means that a DB9-

USB-RS232-M is not pin compatible with a female footprint when placed on the underneath side of the

board.