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
3
4
5
6
7
8
RXD = Receive Data
TXD = Transmit Data
DTR = Data Terminal Ready
GND = RS232 signal ground
DSR = Data Set Ready
RTS = Request To Send
CTS = Clear To Send
3
2
6
5
4
8
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.
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