db9-usb Future Technology Devices International Ltd., db9-usb Datasheet - Page 10

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

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The PC compatible accepted electrical connections for male and female UART DB9 connectors are
illustrated in Figure 3.1 where the structure on the left is the top view of a male UART DB9 connector and
the structure on the right is the top view of a female UART DB9 connector.
Assuming a design follows these connection conventions, then an FTDI male or female DB9-USB
connector can be used to replace this UART DB9 connector to turn this port into an active USB interface.
Examples and signal directions are shown in Figure 3.2 and Figure 3.3
DTE
Figure 3.1 – Male and Female DB9-USB internal connections (top view looking through the module)
UART Connections
GND
DTR
DCD
CTS
TXD
RTS
RXD
DSR
RI
PCB
Copyright © 2011 Future Technology Devices International Limited
1
5
4
3
2
GND
DTR
TXD
RXD
DCD
DSR
RTS
CTS
RI
9
8
6
7
MALE
FEMALE
RTS
DSR
CTS
RI
9
8
7
6
TXD
RXD
DCD
DTR
GND
Document Reference No.: FT_000204
5
4
3
2
1
PCB
GND
RXD
CTS
DTR
Clearance No.: FTDI# 130
DSR
RTS
TXD
DCD
RI
DB9-USB Datasheet
DCE
Version 2.1
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