DB9-USB-F FTDI, DB9-USB-F Datasheet - Page 2

• Manufacturer Part Number: DB9-USB-F
• Description: USB Interface IC USB to RS232Retrofit Adapter DB9 Female
• Manufacturer: FTDI
• Type: USB DB9 Retrofitr

Specifications of DB9-USB-F

• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: Through Hole
• Operating Temperature Range: - 40 C to + 85 C
• Supply Current: 30 mA
• Operating Supply Voltage: 5 V
• Package / Case: DSUB9 Right Angle PCB
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: DB9-USB-RS232-F

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1.1
The DB9-USB-RS232 connectors can be used to upgrade an RS232 port to an active USB port without the
need to redesign the PCB. These active connectors contain all the USB to RS232 (and vice-versa)
conversion electronics and are designed to fit directly into the same PCB footprint as a PC compatible
RS232DB9 connector.
The FTDI DB9-USB-RS232 connectors come in two types DB9-USB-RS232-M and DB9-USB-RS232-F.
A DB9-USB-RS232-M can be used to replace a male DB9 connector that is wired in a PC compatible
RS232manner.
A DB9-USB-RS232-F can be used to replace a female DB9 connector that is wired in a PC compatible
RS232manner.
The purposes of the modules is to provide a simple method of adapting legacy serial devices with RS232
interfaces to modern USB ports by replacing the DB9 connector with this miniaturised module which
closely resembles a DB9 connector. This is accomplished by incorporating the industry standard FTDI
FT232R USB-Serial Bridge IC plus the required level shifters inside the module.
The module uses a standard USB-MINI-B connector for connection to an upstream host or hub port.
RS232-level signals, including modem handshake signals, can transmit data at rates up to 1 Mega Baud.
The DB9-USB-RS232 module requires USB device drivers, available free from www.ftdichip.com, which
are used to make the DB9-USB-RS232 appear as a Virtual COM Port (VCP). This allows existing serial
communications software, such as HyperTerminal, to exchange data through the DB9-USB-RS232 to a
legacy RS232 peripheral device.
Note: The connector is referred as a DB9 connector since DE9 is often referred to by this name.
1.2
In the long distant past, there was no standard defined for the connections on a DB9 connector when it
was used as an RS232 interface. That changed when IBM introduced the PC-AT. This introduced a
generally accepted DB9 RS232 standard and PC peripherals adopted the same pin-out using a 1-to-1
cable connection between the PC and the peripheral. The FTDI DB9-USB-RS232 have adopted this
standard. The DB9 connector used is either male or female.
Note that NOT ALL peripheral adopted this standard so it is important for the user to check against the
pin-out used for the male and female FTDI DB9-USB-RS232 connectors.
Introduction
Functional Description
Background
Copyright © 2010 Future Technology Devices International Limited
Figure 1.1 – DB9-USB-RS232
Document Reference No.: FT_000204
DB9-USB-RS232 Datasheet
Clearance No.: FTDI# 130
Version 1.3
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