db9-usb Future Technology Devices International Ltd., db9-usb Datasheet - Page 13

• Manufacturer Part Number: db9-usb
• Description: The Db9-usb Family Of Usb To Uart Converter Modules
• Manufacturer: Future Technology Devices International Ltd.

3.1.2 Female DB9 UART Connector Signals
The DB9-USB-X-F can be used to replace a female DB9 connector used for transmitting UART signals.
Table 2.2 gives the pin out description of each pin/pad of an UART connector/footprint.
Number
Shield
Pin
1
2
3
4
5
6
7
8
9
Pin Type of
DB9-USB
module
Ground
Ground
Output
Output
Output
Input
Input
Input
Input
Input
Copyright © 2011 Future Technology Devices International Limited
Table 2.2 – Female DB9 UART Signal Description
application PCB
Pad 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-X-F from the
application DCD output)
RXD = Receive Data
(this is an input to the DB9-USB-X-F from the
application Tx output, normally labelled RXD in
DCE convention)
TXD = Transmit Data
(this is an output to the DB9-USB-X-F from the
application Rx input, normally labelled TXD in DCE
convention)
DTR = Data Terminal Ready
(this is an output to the DB9-USB-X-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-X-F from the
application DTR output, normally labelled DSR in
DCE convention)
RTS = Request To Send
(this is an output to the DB9-USB-X-F from the
application CTS input, normally labelled RTS in
DCE convention)
CTS = Clear To Send
(this is an input to the DB9-USB-X-F from the
application RTS output, normally labelled CTS in
DCE convention)
RI = Ring Indicator
(this is an input to the DB9-USB-X-F from the
application RI output)
Drain = typically connected to the host PC case
Document Reference No.: FT_000204
Clearance No.: FTDI# 130
DB9-USB Datasheet
Version 2.1
12