db9-usb-rs232 Future Technology Devices International Ltd., db9-usb-rs232 Datasheet - Page 9

• Manufacturer Part Number: db9-usb-rs232
• Description: Rs232 Connection
• Manufacturer: Future Technology Devices International Ltd.

2.1.3 Replacing an RS232 DB9 FEMALE (DCE defined) Connector
The DB9-USB-RS232-F can be used to replace a female DB9 connector used for transmitting RS232
protocol. With the DB9-USB-RS232-F in place instead of the standard USB connector a USB bridge is
created, this allow the application to communicate with other devices via USB. Installing the DB9-USB-
RS232-F is simple. Simply replace the female DB9 connector with the DB9-USB-RS232-F connector
(same PCB footprint), install drivers and the device is ready to use.
Table 2.3 gives the pin out description of each pad of an RS232 footprint. Figure 2.3 gives a description
of the connections between the DB9-USB-RS232-F and the footprint of a female DB9 module. Figure 2.4
Illustrates the connection made to an example PCB.
Number
Shield
Pin
1
2
3
4
5
6
7
8
9
Pin Type of DB9-
USB-RS232
module
Ground
Ground
Output
Output
Output
Input
Input
Input
Input
Input
Copyright © 2010 Future Technology Devices International Limited
Table 2.3 – A Female RS232 DB9 footprint Pin-Out
application PCB
Pin Type at
Case Ground
Ground
Output
Output
Output
Output
Output
Input
Input
Input
Description
DCD = Data Carrier Detect
(this is an input to the DB9-USB-RS232-F from
the application DCD output)
RXD = Receive Data
(this is an input to the DB9-USB-RS232-F from
the application Tx output, normally labelled RXD
in DCE convention)
TXD = Transmit Data
(this is an output to the DB9-USB-RS232-F from
the application Rx input, normally labelled TXD in
DCE convention)
DTR = Data Terminal Ready
(this is an output to the DB9-USB-RS232-F from
the application DSR input, normally labelled DTR
in DCE convention)
GND = RS232 signal ground
DSR = Data Set Ready
(this is an input to the DB9-USB-RS232-F from
the application DTR output, normally labelled DSR
in DCE convention)
RTS = Request To Send
(this is an output to the DB9-USB-RS232-F from
the application CTS input, normally labelled RTS
in DCE convention)
CTS = Clear To Send
(this is an input to the DB9-USB-RS232-F from
the application RTS output, normally labelled CTS
in DCE convention)
RI = Ring Indicator
(this is an input to the DB9-USB-RS232-F from
the application RI output)
Drain = typically connected to the host PC case
Document Reference No.: FT_000204
DB9-USB-RS232 Datasheet
Clearance No.: FTDI# 130
Version 1.2
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