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Future Technology Devices International Ltd
The DB9-USB Family of USB to
UART Converter Modules
Datasheet
Document Reference No.: FT_000204
Version 2.1
Issue Date: 2011-10-04
Future Technology Devices International Ltd (FTDI)
Unit 1, 2 Seaward Place, Centurion Business Park, Glasgow, G41 1HH, United Kingdom
Tel.: +44 (0) 141 429 2777 Fax: + 44 (0) 141 429 2758
E-Mail (Support): [email protected] Web: http://www.ftdichip.com
Use of FTDI devices in life support and/or safety applications is entirely at the user’s risk, and the user agrees to defend, indemnify and hold harmless FTDI from any and all damages, claims, suits or expense resulting from such use.
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Document Reference No.: FT_000204
DB9-USB Datasheet
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Clearance No.: FTDI# 130
1 Introduction
1.1
The DB9-USB Family of UART Converter Modules
The DB9-USB connector modules can be used to upgrade an RS232 port to an active USB port. In some cases this can be done without the need to redesign the PCB. In some cases they can reduce system costs by removing an RS232 level shifter from a design.
The DB9-USB family consist of 6 modules. Two of these operate at RS232 voltage levels – these can be used as a direct replacement in a system which uses RS232 levels, while four of them operate at digital voltage levels (a choice of 5V or 3.3V) – these can be used to interface to an application systems logic level which could result in the bill-of-materials being reduced by the removal of any RS232 level shifters which may be in the system. Each is available to replace either a male or a female DB9.
1.2
Functional Description
DB9-USB modules can be used to upgrade a UART port of a device to an active USB port. These active connectors contain all the USB to UART (and vice-versa) conversion electronics and are designed to fit directly into the same PCB footprint as a PC compatible UART DB9 connector.
The FTDI DB9-USB RS232 level modules are available in two types DB9-USB-M and DB9-USB-F. Using these modules does not require any changes to a PCB or enclosure.
A DB9-USB-M can be used to replace a male DB9 connector that is wired in a PC compatible RS232 manner. This module operates at RS232 signal levels.
A DB9-USB-F can be used to replace a female DB9 connector that is wired in a PC compatible RS232 manner. This module operates at RS232 signal levels.
The FTDI DB9-USB 3.3V digital voltage level modules are available in two types DB9-USB-D3-M and DB9-
USB-D3-F. Using these modules may require a minor change to the PCB, but saves in material costs by removing the need for an RS232 level shifter.
A DB9-USB-D3-M can be used to replace a male DB9 connector that is wired in a PC compatible RS232 manner. This module operates at 3.3V signal levels.
A DB9-USB-D3-F can be used to replace a female DB9 connector that is wired in a PC compatible RS232 manner. This module operates at 3.3V signal levels.
The FTDI DB9-USB 5V digital voltage level modules are available in two types DB9-USB-D5-M and DB9-
USB-D5-F. Using these modules may require a minor change to the PCB, but saves in material costs by removing the need for an RS232 level shifter.
A DB9-USB-D5-M can be used to replace a male DB9 connector that is wired in a PC compatible RS232 manner. This module operates at 5.0V signal levels.
A DB9-USB-D5-F can be used to replace a female DB9 connector that is wired in a PC compatible RS232 manner. This module operates at 5.0V signal levels.
The purposes of these modules is to provide a simple method of adapting legacy serial devices with UART 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. The RS232 level DB9-USB modules include an RS232 level transceiver.
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Figure 1.1 – DB9-USB Family
DB9-USB modules use a standard USB-MINI-B connector for connection to an upstream host or hub port.
RS232 Level: RS232 level signals, includes modem handshake signals, and capable of transmitting data
at rates up to 1 Mega Baud.
Digital Voltage Level: 3.3V or 5V level signals, includes modem handshake signals, and capable of
transmitting data at rates up to 3 Mega Baud.
DB9-USB modules require USB device drivers, available free from www.ftdichip.com, which are used to make DB9-USB modules appear as a Virtual COM Port (VCP). This allows existing serial communications software, such as HyperTerminal, to exchange data through the DB9-USB to a legacy UART peripheral device.
1.3
Background
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.
DB9-USB modules have adopted this standard. The DB9 connector wire schemes used by this module either the standard male or standard female wire configuration.
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 DB9-USB connectors.
Note: DB9 connectors are also known as DE9 connector since it consists of 9 pins in a size E shell. However DE9 connectors are more commonly referred to as DB9 connector.
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1.4
Block Diagrams
USB Mini B
Client
Connector
FTDI FT232R
USB Serial Bridge
DB9 Module
DB9 Module
RS232
Level Shifter
DB9 PCB
Decal
Figure 1.2 – DB9-USB RS232 Level Block Diagram
USB Mini B
Client
Connector
3.3V
3.3V
VIO
VIO
DB9 Module
DB9 Module
3V3OUT
3V3OUT
FTDI
3.3V TTL/CMOS
UART
DB9 PCB
Decal
Serial Bridge
Figure 1.3 – DB9-USB-D3 Digital Voltage Level Block Diagram
USB Mini B
Client
Connector
5V
5V
DB9 Module
DB9 Module
VIO
VIO
FTDI FT232R
USB Serial Bridge
5V TTL/CMOS
UART
DB9 PCB
Decal
Figure 1.4 – DB9-USB-D5 Digital Voltage Level Block Diagram
1.4.1 Block description
USB Mini B Client Connector
This connector provides the interface for connection to a USB Host or Hub port.
FTDI FT232R
The FTDI FT232R provides the USB-to-Serial conversion. Operating system device drivers are required in order to operate with the FT232R to provide the Virtual COM Port serial functionality.
RS232 Level Shifter
The RS232 level shifter converts the signals provided by the FT232R into the voltage levels required by application RS232 interface.
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DB9-USB PCB Footprint
The DB9-USB pin-out is configured to match the industry standard DB9 footprint. See section 3.
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1.5
Features
Adds one USB serial port by connecting to the RS232 DB9 footprint of a device
Easy placement for an standard Male and Female RS232 DB9 footprint of a device
A selection of RS232, 3.3V or 5V UART signal levels.
Works with USB 1.1 & 2.0 Host and Hub ports
Industry Standard FTDI chip set & device drivers for maximum compatibility
Microsoft Windows
®
WHQL-certified, Mac OS X, Linux and Windows CE device drivers
Installs as a standard Windows COM port
128 byte transmit buffer, 256 byte receive buffer
UART data signals: TxD, RxD, RTS, CTS, DSR, DTR, DCD, RI, GND
Powered by USB port. No external power adapter required.
Serial port speed up to 1Mbps (RS232 levels) or 3Mbps (3.3V/5V levels)
Serial Communication Parameters o
Parity: None, Even, Odd o
Data bits: 7, 8 o
Flow control: RTS/CTS , DSR/DTR, X-ON/X-OFF, None
Operating temperature of -40°C to +85°C
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1.6
Technical Specification & Ordering Information
Parameter
USB Interface
RS232 Interface
UART
Performance
12Mbps USB 2.0 Full-Speed
Standard Windows baud rates (300bps to 921.6Kbps)
Custom baud rates (300bps to 1Mbps) through baud rate aliasing. See
FTDI Application Note : Configuring FT232R, FT2232 and FT232BM Baud
Rates
Standard Windows baud rates (300bps to 921.6Kbps)
Custom baud rates (300bps to 3Mbps) through baud rate aliasing.
Table 1.1 – Performance Specifications
Order Code
DB9-USB-M
DB9-USB-F
DB9-USB-D3-M
DB9-USB-D3-F
DB9-USB-D5-M
DB9-USB-D5-F
Description
Full Speed USB to 1-Port RS232 level UART module that can replace an RS232 Level
UART DB9 male connector
Full Speed USB to 1-Port RS232 level UART module that can replace an RS232 level
UART DB9 female connector
Full Speed USB to 1-Port 3.3V level UART module that can replace 3.3V level UART DB9 male connector
Full Speed USB to 1-Port 3.3V level UART module that can replace 3.3V level UART DB9 female connector
Full Speed USB to 1-Port 5V level UART module that can replace 5V UART DB9 male connector
Full Speed USB to 1-Port 5V level UART module that can replace 5V UART DB9 female connector
Table 1.2 – Ordering Information
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Table of Contents:
1 Introduction ................................................................................... 1
The DB9-USB Family of UART Converter Modules .......................................... 1
Technical Specification & Ordering Information ............................................ 6
2 USB Connections ............................................................................ 8
3 UART Connections .......................................................................... 9
Male DB9 UART Connector Signals ............................................................. 11
Female DB9 UART Connector Signals ......................................................... 12
Microsoft Windows Installation .................................................................. 13
Mac OS X, Linux, Windows CE ................................................................... 17
5 Electrical details ........................................................................... 18
6 Mechanical Details ........................................................................ 19
7 Physical Environment Details ....................................................... 20
8 Environmental Approvals & Declarations ...................................... 21
9 Troubleshooting ........................................................................... 22
10 Contact Information ..................................................................... 23
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2 USB Connections
DB9-USB modules are downstream USB 2.0 Devices. A “USB mini B” receptacle is mounted inside the modules to facilitate connection to an upstream USB Host or Hub.
Pin Number Pin Type Description
3
4
1
2
5
Shield
Power
Bidirectional
Bidirectional
ID
VBUS – USB Power provided from upstream USB Host or Hub
D– = USB data signal, negative polarity
D+ = USB data signal, positive polarity
Not Connected
Ground GND = USB signal ground
Case Ground Drain = typically connected to the host PC case
Table 2.1 – USB “mini-B” Receptacle Pin-Out
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3 UART Connections
The PC compatible accepted electrical connections for male and female UART DB9 connectors are
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.
DTE
GND
RI
DTR
CTS
TXD
RTS
RXD
DSR
DCD
PCB
5
GND
4
DTR
3
9
RI
8
CTS
TXD
7
2
RXD
RTS
6
1
DCD
DSR
MALE FEMALE
GND
5
9
RI
8
CTS
DTR
7
TXD
4
3
RTS
RXD
2
6
DSR
DCD
1
PCB
GND
RI
DSR
RTS
RXD
CTS
TXD
DTR
DCD
DCE
Figure 3.1 – Male and Female DB9-USB internal connections (top view looking through the module)
Examples and signal directions are shown in Figure 3.2 and Figure 3.3
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DCD
DSR
RXD
RTS
DB9 Pin1
DB9 Pin6
DB9 Pin2
DB9 Pin7
TXD
CTS
DB9 Pin3
DB9 Pin8
DTR
RI
DB9 Pin4
DB9 Pin9
GND DB9 Pin5
DSR
RTS
CTS
RI
DCD
RXD
TXD
DTR
GND
Figure 3.2 – DB9-USB Male Connection illustration
GND DB9 Pin5
RI
DTR
CTS
DB9 Pin9
DB9 Pin4
DB9 Pin8
TXD
RTS
RXD
DSR
DCD
DB9 Pin3
DB9 Pin7
DB9 Pin2
DB9 Pin6
DB9 Pin1
RI
RTS
CTS
DTR
GND
DSR
RXD
TXD
DCD
Figure 3.3 – DB9-USB Female Connection illustration
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3.1.1 Male DB9 UART Connector Signals
The DB9-USB-X-M can be used to replace a male DB9 connector used for transmitting UART signals.
Table 2.1 gives the pin out description of each pin/pad of a UART connector/footprint.
Pin
Number
Pin Type of DB9-
USB module
Pad Type at application PCB
Description
1
2
3
4
Input
1
Output
Input
Input
Input
1
Input
Output
Output
DCD = Data Carrier Detect
RXD = Receive Data
(this is an output from the DB9-USB-X-M to the application Rx input)
TXD = Transmit Data
(this is an input to the DB9-USB-X-M from the application Tx output)
DTR = Data Terminal Ready
(this is an input to the DB9-USB-X-M from the application DTR output)
5
6
7
8
Ground
Output
Input
Output
Ground
Input
Output
Input
GND = RS232 signal ground
DSR = Data Set Ready
(this is an output from the DB9-USB-X-M to the application DSR input)
RTS = Request To Send
(this is an input to the DB9-USB-X-M from the application RTS output)
CTS = Clear To Send
(this is an output from the DB9-USB-X-M to the application CTS input)
9 Input
1
Input
1
RI = Ring Indicator
Shield Ground Case Ground
Drain = typically connected to the host PC case
Table 2.1 – Male DB9 UART Signal Description
Note 1: These signals are irrelevant for DTE to DTE connections.
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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.
Pin
Number
Pin Type of
DB9-USB module
Pad Type at application PCB
Description
1
2
3
4
5
6
7
8
9
Shield
Input
Input
Output
Output
Ground
Output
Output
Input
Input
Ground
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
Input
Output
Input
Input
Output
Input
Output
Output
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)
Ground Case Ground Drain = typically connected to the host PC case
Table 2.2 – Female DB9 UART Signal Description
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4 Installation
4.1
Device Driver Installation
The drivers for the DB9-USB modules are available for download from: www.ftdichip.com
The following section illustrates an example installation on the Windows OS.
4.1.1 Microsoft Windows Installation
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With the device drivers being Windows Hardware Quality Labs (WHQL) certified, they are also available through download directly from the Microsoft are noted below:
®
Windows
®
Update service. Additional installation options
Installation Executable shown on Windows XP
1) Login to the system as Administrator, or a user with Administrator rights.
2) Prior to connecting the DB9-USB module to the USB Host or Hub port, download the latest device driver version from the FTDI Chip web site.
3) Run this executable to install the device drivers.
4) Connect the DB9-USB module to your computer. A notification will appear near the task bar indicating that new hardware has been installed and is ready for use. It is normal if this notice appears twice.
Figure 3.1 – Hardware Ready
Windows Update shown on Windows XP
You must have an active Internet connection and the Windows Update Service enabled.
1) Connect the DB9-USB module to your USB Host or Hub.
2) The “Found New Hardware” Wizard will appear. The first dialog should ask whether it is acceptable to use the Windows Update Service to find the device driver.
Figure 3.2 – Found New Hardware Wizard
3) Select one of the “Yes” choices and click “Next”.
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4) The following screen appears:
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Figure 3.3 – Automatic Install
5) Wait while the driver is found, downloaded, and installed. This step may take a couple minutes depending on the Internet speed.
6) After the files are found and installed, click “Finish” to complete the installation.
Figure 3.4 – Complete Hardware Installation
7) Steps 2 through 6 will repeat. The first time installs the basic USB Serial Converter in the USB device tree. The second time installs the Virtual COM Port layer in the Ports tree and assigns the
COM port number.
8) When both portions of the device driver have been installed successfully, the following message will appear, indicating that the device is ready.
Figure 3.5 – Hardware Ready
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COM Port Assignment
Next, to determine which COM port has been assigned, open the Windows Device Manager from the
System Control Panel.
Figure 3.6 – Device Manager
Click on the Plus “+” sign next to the Ports tree to list the available COM port. You will see “USB Serial
Port”, followed by a COM assignment. In the figure below, the DB9-USB module is assigned to COM3.
Figure 3.7 – COM Port Assignment
Use this COM port number with your application software in order to access the DB9-USB module.
If an application requires use of a different COM port number, the assignment may be changed through the Advanced Driver Options settings.
From the Device Manager listing above, right-click on the USB Serial Port and select Properties.
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Figure 3.8 – Access COM Port Properties
Next, click on the “Port Settings” tab.
Then click on the “Advanced…” button.
Figure 3.9 – Settings Tab
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Figure 3.10 – Advanced Options
This will display the various advanced settings. Note the COM port assignment in the upper left. Clicking on the drop-down list will display the available port numbers. Select one that is not in use and click OK on each dialog box to activate the selection. Windows will remember this COM port number.
4.1.2 Mac OS X, Linux, Windows CE
Device drivers and FTDI installation guides for Mac OS X, Linux and Windows CE are available for download on the FTDI Chip web site. Follow the respective FTDI installation guides for the chosen operating system.
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5 Electrical details
5.1
USB
Parameter Description
USB_VCC Input Power Voltage*
Minimum Typical Maximum Units
4.25 5.0* 5.25 V
Icc USB current 30 50
Table 5.1 – USB Electrical Details
5.2
RS232 Level UART
Parameter
Vtrans
Vrec mA
Description
Transmitter output voltage swing
Receiver input voltage range
Minimum Typical Maximum Units
± 5
±2.4 ±25
V
V
ESD HBM ±15
Table 5.2 – RS232 Electrical Details
5.3
3.3V Level UART
KV
Parameter
Voh
Vol
Description
Output Voltage High
Output Voltage Low
Minimum Typical Maximum Units
2.2 2.7 3.2 V
0.3 0.4 0.5 V
Vin Input Switching
Threshold
1.0
1.2 1.5
Table 5.3 – 3.3V Level UART Electrical Details
5.4
5V Level UART
V
Parameter
Voh
Vol
Vin
Description
Output Voltage High
Output Voltage Low
Minimum Typical Maximum Units
3.2 4.1 4.9 V
0.3 0.4 0.6
Input Switching
Threshold
1.0
1.2 1.5
Table 5.4 – 5V Level UART Electrical Details
V
V
Conditions
*Present when USB cable is attached and
USB Host or Hub powered.
Conditions
RL = 3KΩ
Input resistance = 3KΩ to 7KΩ
RS-232 Inputs and
Outputs
Conditions
I source = 1mA
I sink = 2mA
**
Conditions
I source = 2mA
I sink = 2mA
**
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6 Mechanical Details
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Figure 5.1 – DB9-USB dimensions
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7 Physical Environment Details
7.1
Storage
Parameter
T
Description
Storage Temperature
Range
Minimum Typical Maximum
-65 +85
Table 7.1 – Storage Temperature
Units o
C
7.2
Operating
Parameter
T
Description Minimum Typical Maximum Units
Operating Temperature
Range
–40 +85
Table 7.2 – Operating Temperature
o
C
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Conditions
Conditions
5% to 95% RH, non condensing
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8 Environmental Approvals & Declarations
8.1
EMI Compatibility
FCC and CE
DB9-USB modules are certified for both FCC Part 15 Subpart B and European EMC Directive.
NOTE: This is a Class B product. In a domestic environment, this product may cause radio interference, in which case the user may be required to take adequate measures.
NOTE: This equipment is currently undergoing testing to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
Reorient or relocate the receiving antenna.
Increase the separation between the equipment and receiver.
Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
Consult the dealer or an experienced radio/TV technician for help.
8.2
Safety
The DB9-USB modules are defined as Limited Power Supply (LPS) device, with operating voltages under
60VDC.
8.3
Environmental
The DB9-USB modules are lead-free devices that comply with the following environmental directives:
RoHS, WEEE, REACH, PFOS and DecaBDE.
8.4
Reliability
The DB9-USB modules are designed to be a robust USB-Serial module for use in many environments.
There are no user-serviceable parts. Any failure will require a replacement of the unit.
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8.5
Import / Export Information
Import / Export Information
Country of Origin
Harmonized Code
China
8.5.1.1 8471.80.4000
Product Description USB to Connector Adapter, Single Port
USA ECCN EAR99 – No License Required
Table 8.1 – Import / Export Information
9 Troubleshooting
Ensure the latest device driver is in use. See www.ftdichip.com
If USB devices other than FTDI chips are installed in the system, then check with all manufacturers of these devices for the latest device drivers.
Section 4 details driver installation. If the user continues to have driver installation issues, then please refer to the FTDI installation guides http://ftdichip.com/Documents/InstallGuides.htm
for additional details.
Common Windows Device Driver Troubles:
DEVICE TIMES OUT: The default settings of the device driver assume typical data transfers of hundreds to thousands or more bytes at a given time. Some applications, such as a GPS device, only send data in short packets, often only a few bytes. If this is the case, it may be necessary to adjust the driver buffer size and/or latency timer to smaller values. These values can be adjusted through the advanced driver options. The buffer size can be reduced to 64 bytes. The latency timer can be set as low as 2ms. A setting of 1ms will cause unnecessary USB traffic and could adversely affect data transmission. Advanced driver options are described in http://www.ftdichip.com/Documents/AppNotes/AN_107_AdvancedDriverOptions_AN_000073.pdf
ERRATIC MOUSE POINTER: The device driver defaults to query an attached device to find out whether it is a mouse or modem, consistent with native COM port operation. Some RS232 peripherals constantly send short packets of data, causing the host system to “think” a mouse or modem has been attached. These short packets will interfere with normal mouse operation causing the pointer to jump around the screen. If this happens, disconnect the RS232 device and
uncheck the Serial Enumerator option, also found on the advanced driver options.
COM PORT IN USE: Windows keeps track of all COM port assignments. If multiple FTDIChip products have been connected to a single system, the COM port number will increase, even if the other devices are not attached. If the higher COM port assignments are not acceptable for the application, known unused COM port numbers should be uninstalled according to the FTDI installation guide: http://ftdichip.com/Documents/InstallGuides.htm
.
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10 Contact Information
Head Office – Glasgow, UK
Future Technology Devices International Limited
Unit 1, 2 Seaward Place
Centurion Business Park
Glasgow, G41 1HH
United Kingdom
Tel: +44 (0) 141 429 2777
Fax: +44 (0) 141 429 2758
E-mail (Sales) [email protected]
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Copyright © 2011 Future Technology Devices International Limited 23
Document Reference No.: FT_000204
DB9-USB Datasheet
Version 2.1
Clearance No.: FTDI# 130
Distributor and Sales Representatives
Please visit the Sales Network page of the FTDI Web site for the contact details of our distributor(s) and sales representative(s) in your country.
System and equipment manufacturers and designers are responsible to ensure that their systems, and any Future
Technology Devices International Ltd (FTDI) devices incorporated in their systems, meet all applicable safety, regulatory and system-level performance requirements. All application-related information in this document (including application descriptions, suggested FTDI devices and other materials) is provided for reference only. While FTDI has taken care to assure it is accurate, this information is subject to customer confirmation, and FTDI disclaims all liability for system designs and for any applications assistance provided by FTDI. Use of FTDI devices in life support and/or safety applications is entirely at the user’s risk, and the user agrees to defend, indemnify and hold harmless FTDI from any and all damages, claims, suits or expense resulting from such use. This document is subject to change without notice. No freedom to use patents or other intellectual property rights is implied by the publication of this document.
Neither the whole nor any part of the information contained in, or the product described in this document, may be adapted or reproduced in any material or electronic form without the prior written consent of the copyright holder.
Future Technology Devices International Ltd, Unit 1, 2 Seaward Place, Centurion Business Park, Glasgow G41 1HH,
United Kingdom. Scotland Registered Company Number: SC136640.
Copyright © 2011 Future Technology Devices International Limited 24
Document Reference No.: FT_000204
DB9-USB Datasheet
Version 2.1
Clearance No.: FTDI# 130
Appendix A – References
AN_149_Upgrading a DB9 RS232 Interface to USB using an FTDI DB9-USB-RS232 Module
Appendix B – Revision History
Version Draft First Draft
Version 1.0
Version 1.1
Version 1.2
First release
Updated part numbers
Added Figures 2.2 and 2.4. Updated tables 2.2 and 2.3
Version 1.3
Version 2.0
Version 2.1
Added note 1 to Table 2.2
Simplified datasheet
Changed DB9-USB-RS232-M/F name to match the part number : DB9-USB-M/F
Added details on Digital 3.3V and Digital 5V modules
Edited descriptions
October 2009
18 th
November 2009
19 th
February 2010
1 st
June 2010
5 th
November 2010
31 st
August 2011
4 th
October 2011
Copyright © 2011 Future Technology Devices International Limited 25
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