Future Technology Devices International Ltd
USB-COM485-PLUS1
Datasheet
Document Reference No.: FT_000132
Version 1.21
Issue Date: 2010-10-06
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): support1@ftdichip.com Web: http://www.ftdichip.com
Neither the whole nor any part of the information contained in, or the product described in this manual, may be adapted or reproduced
in any material or electronic form without the prior written consent of the copyright holder. This product and its documentation are
supplied on an as-is basis and no warranty as to their suitability for any particular purpose is either made or implied. Future Technology
Devices International Ltd will not accept any claim for damages howsoever arising as a result of use or failure of this product. Your
statutory rights are not affected. This product or any variant of it is not intended for use in any medical appliance, device or system in
which the failure of the product might reasonably be expected to result in personal injury. This document provides preliminary
information that may be subject to change without notice. No freedom to use patents or other intellectual property rights is implied by
the publication of this document. Future Technology Devices International Ltd, Unit1, 2 Seaward Place, Centurion Business Park,
Glasgow, G41 1HH, United Kingdom. Scotland Registered Number: SC136640
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Document Reference No.: FT_000132
USB-COM485-PLUS1 Datasheet
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1
Introduction
1.1 Functional Description
The USB-COM-Plus modules are a family of communication devices. This model, USB-COM485-Plus1,
provides a simple method of adapting legacy serial devices with RS485 interfaces to modern USB ports.
This is accomplished by incorporating the industry standard FTDI FT232R USB-Serial bridge chip.
The integrated electronics of the USB-COM485-PLUS1 utilise the FTDI FT232R and includes RS485 level
shifters plus TXD/RXD LEDs to provide a visual indication of data traffic through the module.
Figure 1.1 USB-COM485-Plus1
The module uses a standard USB-B device connector for connection to an upstream host or hub port.
RS485-level signals are available on an industry-standard DE-9P connector. The maximum RS485-level
data rate is 3Mbps.
Pin 9 of the DE-9P connector can provide +5V DC at 250mA.
The USB-COM485-Plus1 module requires USB device drivers, available free from www.ftdichip.com, which
are used to make the USB-COM485-Plus1 appear as a Virtual COM Port (VCP). This allows existing serial
communications software, such as HyperTerminal, to exchange data through the USB-COM485-Plus1 to a
legacy RS485 peripheral device.
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1.2 LED Description
The USB-COM485-Plus1 uses three LEDs to indicate a valid link as well as data traffic according to the
following table:
LED Color
Function
Description
Yellow
Enumerated
ON when USB-COM485-Plus1 is configured and ready
Green
TxD Activity
Flashes when data is transmitted from the USB-COM485-Plus1 to the
attached RS485 device
Red
RxD Activity
Flashes when data is transmitted from the attached RS485 device to the
USB-COM485-Plus1
Table 1.1 LED Description
1.3 Block Diagram
USB B
Client
Connector
FTDI FT232R
USB Serial Bridge
RS485
Level Shifter
DE-9P
Connector
Figure 1.2 USB-COM485-Plus1 Block Diagram
1.3.1 Block description
USB B Client Connector
This connector provides the interface for connection to a USB Host or Hub port. The maximum cable
length is 5 meters, according to the USB 2.0 specification.
FTDI FT232R
The FTDI FT232R provides the USB-to-Serial conversion. Operating system device drivers are required in
order to work with the FT232R to provide the Virtual COM Port serial functionality.
RS485 Level Shifter
The RS485 level shifter converts the signals provided by the FT232R into the voltage levels required by
RS485 devices.
DE-9P Connector (Male)
The DE-9P connector is configured in an industry standard (TIA/EIA-485) pin-out to provide connection to
RS485 peripherals through standard cables. See section 3.1.2
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1.4 Features
Adds one RS-485 serial port by connecting to USB
Easy plug & play installation and RS-485 device connection
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
COM port number can be changed to any available COM port number, to support HyperTerminal,
or any other serial communications software application running in Windows
Supports Windows Server 2008, 2003, Vista, XP, 2000, Linux, Mac OS X
FIFO: 128 byte transmit buffer, 256 byte receive buffer
RS-485 data signals: Data+, Data-, GND
Option to enable or disable local echo
Powered by USB port. No external power adapter required.
Pin 9 of DE-9P can provide +5VDC output at 250mA.
Serial port speed up to 3Mbps
Serial Communication Parameters
o
Parity: None, Even, Odd
o
Data bits: 7, 8
o
Flow control: None
One DE-9P male connector
LEDs indicate USB Enumeration, RxD, TxD for monitoring port status & easy diagnostics
Operating temperature of -40°C to +85°C
1.5 Performance Figures
Parameter
Performance
USB Interface
12Mbps USB 2.0 Full-Speed
Standard baud rates (300bps to 921.6Kbps)
RS485 Interface
Custom baud rates (300bps to 3Mbps) through baud rate aliasing. See
FTDI Application Note: Configuring FT232R, FT2232 and FT232BM Baud
Rates
Max Cable Length
USB = 5m, RS485 =1200m
Table 1.2 Performance Figures
Part Number
Description
USB-COM485-Plus1
USB-COM-Plus Full-Speed USB to 1-Port RS485 module
Table 1.3 Ordering Information
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1
Introduction ................................................................................... 1
1.1
Functional Description .................................................................................. 1
1.2
LED Description ............................................................................................. 2
1.3
Block Diagram ............................................................................................... 2
1.3.1
2
1.4
Features ........................................................................................................ 3
1.5
Performance Figures ..................................................................................... 3
Installation ..................................................................................... 6
2.1
Example Applications and Configurations ..................................................... 6
2.1.1
2.2
5
2.2.2
Mac OS X, Linux, Windows CE ................................................................... 10
7
Local Echo ................................................................................................... 10
Connections .................................................................................. 11
External Connectors .................................................................................... 11
3.1.1
USB ....................................................................................................... 11
3.1.2
RS485 .................................................................................................... 11
Electrical details ........................................................................... 12
4.1
USB ............................................................................................................. 12
4.2
RS485 ......................................................................................................... 12
4.3
Power Output .............................................................................................. 13
Mechanical Details ........................................................................ 14
5.1
6
Device Driver Installation ............................................................................. 7
Microsoft Windows ..................................................................................... 7
3.1
4
Module Mechanical Dimensions ................................................................... 14
Physical Environment Details ....................................................... 15
6.1
Storage ....................................................................................................... 15
6.2
Operating .................................................................................................... 15
Environmental Approvals & Declarations ...................................... 16
7.1
EMI Compatibility ........................................................................................ 16
7.2
Safety.......................................................................................................... 16
7.3
Environmental ............................................................................................. 16
7.4
Reliability .................................................................................................... 16
7.4.1
7.5
8
Wiring ...................................................................................................... 6
2.2.1
2.3
3
Block description ....................................................................................... 2
MTTF ..................................................................................................... 16
Import / Export Information ....................................................................... 17
Troubleshooting ........................................................................... 18
8.1
Hardware .................................................................................................... 18
8.2
Device Driver .............................................................................................. 18
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8.3
9
Technical Support ....................................................................................... 18
Contact Information ..................................................................... 20
Appendix A - List of Figures and tables .............................................. 22
Appendix B - Revision History ............................................................ 23
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2
Installation
2.1 Example Applications and Configurations
2.1.1 Wiring
Insert the A-plug into an available USB Host or Hub port. Insert the B-plug into the B-receptacle on the
USB-COM485-Plus1.
DTE Pin Number
1
Expected Connect Signal
Signal Name
DATA- = Transmit/Receive
Data, negative polarity
Also Terminator 2
DATAPin 2 of 120R Terminating Resistor. Only Required if the USBCOM485-PLUS1 is the first or last device in a multi-drop RS485
System, to meet RS485 Termination Requirements.
2
DATA+ = Transmit/Receive
DATA+
Data, positive polarity
3
Terminator 1
Pin 1 of 120R Terminating Resistor. Only Required if the USBCOM485-PLUS1 is the first or last device in a multi-drop RS485
System, to meet RS485 Termination Requirements.
4
N/A
N/A
5
GND = signal ground
GND
6
N/A
N/A
7
N/A
N/A
8
N/A
N/A
9
PWR = +5V DC output
PWR
Table 2.1 RS485 DTE to DCE connection
Figure 2.1 USB-COM485-PLUS1 Termination resistor
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2.2 Device Driver Installation
The USB-COM485-Plus1 module drivers are available for download from:
www.ftdichip.com
2.2.1 Microsoft Windows
With the device drivers being Windows Hardware Quality Labs (WHQL) certified, they are also available
through download directly from the Microsoft® Windows® Update service. This is the best choice when
connecting the USB-COM485-Plus1 to a computer running Windows Vista. Additional installation options
are noted below:
Installation Executable shown on Windows XP
1) Login to your system as Administrator, or a user with Administrator rights.
2) Prior to connecting the USB-COM485-Plus1 to the USB Host or Hub port, download the latest
device driver version from the FTDIChip web site.
3) Run this executable to install the device drivers.
4) Connect the USB-COM485-Plus1 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 2.2 Hardware Ready
Windows Update shown on Windows XP
You must have an active Internet connection and the Windows Update Service enabled.
1) Connect the USB-COM485-Plus1 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 2.3 Found New Hardware Wizard
3) Select one of the “Yes” choices and click “Next”.
4) The following screen appears:
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Figure 2.4 Automatic Install
5) Wait while the driver is found, downloaded, and installed. This step may take a couple minutes
base on the Internet speed.
6) After the files are found and installed, click “Finish” to complete the installation.
Figure 2.5 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 2.6 Hardware Ready
COM Port Assignment
Next, to determine which COM port has been assigned, open the Windows Device Manager from the
System Control Panel.
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Figure 2.7 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 COMn assignment. In the figure below, the USB-COM485-Plus1 is assigned to COM3.
Figure 2.8 COM Port Assignment
Use this COM port number with your application software in order to access the USB-COM485-Plus1.
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.
Figure 2.9 Access COM Port Properties
Next, click on the “Port Settings” tab.
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Figure 2.10 Settings Tab
Then click on the “Advanced…” button.
Figure 2.11 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.
2.2.2 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 FTDIChip web sites. Follow the respective FTDI installation guides for the chosen
operating system.
2.3 Local Echo
The ability to enable or disable local echo on the RS485 data is controlled by the setting in the FT232R
EEPROM. A free utility is provided to change the configuration. The default is for local echo to be disabled.
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3
Connections
3.1 External Connectors
3.1.1 USB
The USB-COM485-Plus1 is a downstream USB 2.0 Device. A standard USB Series “B” receptacle is
reference to USB-F-1001 to facilitate connection to an upstream USB Host or Hub.
Pin Number
Pin Type
Description
1
Power
2
Bidirectional
D– = USB data signal, negative polarity
3
Bidirectional
D+ = USB data signal, positive polarity
4
Ground
Shield
Case Ground
VBUS = USB Power provided from upstream USB Host or Hub
GND = USB signal ground
Drain = typically connected to the host PC case
Table 3.1 USB "B" Receptacle Pin-Out
3.1.2 RS485
The RS485 port is configured as Data Terminal Equipment (DTE), with a 9-contact D-Sub Pin connector.
Pin assignments are according to TIA/EIA-485. In addition, pin9 of DE-9P may be assigned to provide
+5VDC to an external device with a maximum current draw of 250mA once the USB-COM485-Plus1 has
been enumerated by the system.
Pin Number
Pin Type
Description
DATA- = Transmit/Receive Data, negative polarity
1
Input/Output
Pin 2 of 120R Terminating Resistor. Only Required if the USB-COM485PLUS1 is the first or last device in a multi-drop RS485 System, to meet
RS485 Termination Requirements.
2
Input/Output
3
Input/Output
DATA+ = Transmit/Receive Data, positive polarity
Pin 1 of 120R Terminating Resistor. Only Required if the USB-COM485PLUS1 is the first or last device in a multi-drop RS485 System, to meet
RS485 Termination Requirements.
4
N/A
N/A
5
Ground
6
N/A
N/A
7
N/A
N/A
8
N/A
N/A
9
Power
GND = signal ground
provide +5VDC to an external device
Table 3.2 DE-9P RS485 Pin-Out
A 120R Resistor is connected internally between pin 1 and pin 3 of the 9 way D-type connector – see
Figure 2.1
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4
Electrical details
4.1 USB
Parameter
Description
Minimum
Typical
Maximum
Units
Conditions
*Present when USB
USB_VCC
Input Power Voltage*
4.25
5.0*
5.25
V
cable is attached and
USB Host or Hub
powered.
***Does not include
Icc
USB current***
30
50
mA
power supplied to
external device
connected to pin 9
Table 4.1 USB Electrical Details
4.2 RS485
Parameter
Description
Minimum
Typical
-7
+12
Maximum
Units
Conditions
Receiver Input
VCM
Common-mode input
V
voltage range
IN
Input Current
VIN = +12V
1.0
mA
VIN = -7V
-0.8
Differential Threshold
VTH
VIHYST
RIN
Voltage
+0.2
-0.2
Input Hysteresis
Input Resistance, RIN
12
Differential Output
Voltage
1.5
V
20
mV
15
kΩ
Transmitter Output
VOD
5
V
With RL = 54Ω.
CL = 50pF *
ESD Tolerance
ESD HBM
RS485 Inputs and
Outputs
±15
kV
EN61000-4-2
Contact Discharge
RS-485 Inputs and
Outputs
±8
kV
EN61000-4-2 Air
Gap Discharge
RS-485 Inputs and
Outputs
±15
kV
Table 4.2 RS485 Electrical Details
* - The 54 ohms is the equivalent of two 120 ohm termination resistors placed on each side of the
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transmission line and the input impedance of 32 receivers on the line.
4.3 Power Output
The USB-COM485-Plus1 assign pin9 of DE-9P to provide +5V DC for an external device that requires
power. The maximum allowable current is 500mA, including the circuitry of the USB-COM485-Plus1
itself. Up to 250mA may be used by the external device.
Parameter
Description
Minimum
Typical
Maximum
Units
Conditions
5.0
5.25
V
N/A
250
mA
N/A
VCC_5V
Output Power Voltage
4.25
IO
Output Power Current
0
Table 4.3 Power Output for USB-COM485-Plus1
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5
Mechanical Details
5.1 Module Mechanical Dimensions
12 mm
5
6
18 mm
12.5 mm
3
16 mm
9 mm
14 mm
21 mm
27 mm
57 mm
30 mm
24 mm
32 mm
13 mm
12 mm
37 mm
Figure 5.1 USB-COM485-Plus1 PCB Dimensions
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6
Physical Environment Details
6.1 Storage
Parameter
T
Description
Minimum
Storage Temperature
Range
Typical
-65
Maximum
+150
Units
Conditions
o
C
Table 6.1 Storage Temperature
6.2 Operating
Parameter
T
Description
Minimum
Operating Temperature
Range
–40
Typical
Maximum
+85
Units
o
C
Conditions
5% to 95% RH,
non condensing
Table 6.2 Operating Temperature
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7
Environmental Approvals & Declarations
7.1 EMI Compatibility
FCC and CE
The USB-COM485-Plus1 has been tested to be compliant with 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 has been tested and found 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.
7.2 Safety
The USB-COM485-Plus1 is defined as Limited Power Supply (LPS) device, with operating voltages under
60VDC.
7.3 Environmental
The USB-COM485-Plus1 is a lead-free device that complies with the following environmental directives:
RoHS, WEEE, REACH, PFOS and DecaBDE.
7.4 Reliability
The USB-COM485-Plus1 is designed as 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.
7.4.1 MTTF
The Mean Time To Failure is calculated at TBD hours.
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7.5 Import / Export Information
Import / Export Information
Country of Origin
China
Harmonized Code
TBD
Product Description
USB to RS485 Development Module, Single Port
USA ECCN
EAR99 – No License Required
Table 7.1 Import / Export Information
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8
Troubleshooting
8.1 Hardware
Cables are the most common sources of trouble with external devices.
Check the following:
-
USB cable is properly inserted at both ends
-
Computer power is ON
-
Computer is not in Sleep or Standby
-
If a USB Hub is used, be sure it is set for “Self-Powered” operation
-
If a USB Hub is used, be sure all cables are properly inserted
-
If all the above are OK, the Yellow LED should be lit, indicating the device has been recognized by the
USB subsystem.
RS485 cables – check the following:
-
Check for specific handshake requirements of your RS485 peripheral.
-
Because there is no handshake signals, ensure the application is set to “No Hardware Handshake”, or
equivalent.
8.2 Device Driver
Ensure the latest device driver is in use. See www.ftdichip.com
If other devices with FTDI chips are installed in the system, check with all manufacturers of these devices
for the latest device drivers.
See the FTDI installation guides for additional details: http://ftdichip.com/Documents/InstallGuides.htm
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 as noted in Figure 2.13. 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.
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 RS485
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 RS485 device and
uncheck the Serial Enumerator option, also found on the Advanced driver options screen in Figure
2.13.
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.
8.3 Technical Support
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Technical support may be obtained from your nearest FTDIChip office:
United Kingdom:
support1@ftdichip.com
United States:
us.support@ftdichip.com
China:
cn.support@ftdichip.com
Taiwan
tw.support1@ftdichip.com
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9
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) sales1@ftdichip.com
E-mail (Support) support1@ftdichip.com
E-mail (General Enquiries) admin1@ftdichip.com
Web Site URL http://www.ftdichip.com
Web Shop URL http://www.ftdichip.com
Branch Office – Shanghai, China
Future Technology Devices International Limited (China)
Room 408, 317 Xianxia Road,
ChangNing District,
ShangHai, China
Tel: +86 (21) 62351596
Fax: +86(21) 62351595
E-Mail (Sales): cn.sales@ftdichip.com
E-Mail (Support): cn.support@ftdichip.com
E-Mail (General Enquiries): cn.admin1@ftdichip.com
Web Site URL: http://www.ftdichip.com
Branch Office – Taipei, Taiwan
Future Technology Devices International Limited (Taiwan)
2F, No 516, Sec. 1 NeiHu Road
Neihu District
Taipei 114
Taiwan, R.O.C.
Tel: +886 (02) 8797 1330
Fax: +886 (02) 8751 9737
E-mail (Sales)
tw.sales1@ftdichip.com
E-mail (Support) tw.support1@ftdichip.com
E-mail (General Enquiries) tw.admin1@ftdichip.com
Web Site URL
http://www.ftdichip.com
Branch Office – Hillsboro, Oregon, USA
Future Technology Devices International Limited (USA)
7235 NW Evergreen Parkway, Suite 600
Hillsboro, OR 97123-5803
USA
Tel: +1 (503) 547 0988
Fax: +1 (503) 547 0987
E-Mail (Sales)
us.sales@ftdichip.com
E-Mail (Support) us.support@ftdichip.com
E-mail (General Enquiries) us.admin@ftdichip.com
Web Site URL
http://www.ftdichip.com
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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.
Vinculum is part of Future Technology Devices International Ltd. Neither the whole nor any part of the information contained in, or the product described in
this manual, may be adapted or reproduced in any material or electronic form without the prior written consent of the copyright holder. This product and its
documentation are supplied on an as-is basis and no warranty as to their suitability for any particular purpose is either made or implied. Future Technology
Devices International Ltd will not accept any claim for damages howsoever arising as a result of use or failure of this product. Your statutory rights are not
affected. This product or any variant of it is not intended for use in any medical appliance, device or system in which the failure of the product might
reasonably be expected to result in personal injury. This document provides preliminary information that may be subject to change without notice. No
freedom to use patents or other intellectual property rights is implied by the publication of this document. Future Technology Devices International Ltd, Unit
1, 2 Seaward Place, Centurion Business Park, Glasgow G41 1HH United Kingdom. Scotland Registered Number: SC136640
Copyright © 2010 Future Technology Devices International Limited
21
Document Reference No.: FT_000132
USB-COM485-PLUS1 Datasheet
Version 1.21
Clearance No.: FTDI# 95
Appendix A - List of Figures and tables
List of Figures:
Figure 1.1 USB-COM485-Plus1 ....................................................................................................................... 1
Figure 1.2 USB-COM485-Plus1 Block Diagram ............................................................................................ 2
Figure 2.1 Hardware Ready ............................................................................................................................ 7
Figure 2.2 Found New Hardware Wizard ....................................................................................................... 7
Figure 2.3 Automatic Install ............................................................................................................................ 8
Figure 2.4 Complete Hardware Installation ................................................................................................... 8
Figure 2.5 Hardware Ready ............................................................................................................................ 8
Figure 2.6 Device Manager ............................................................................................................................. 9
Figure 2.7 COM Port Assignment .................................................................................................................. 9
Figure 2.8 Access COM Port Properties ........................................................................................................ 9
Figure 2.9 Settings Tab ................................................................................................................................. 10
Figure 2.10 Advanced Options ..................................................................................................................... 10
Figure 5.1 USB-COM485-Plus1 PCB Dimensions ...................................................................................... 14
List of tables:
Table 1.1 LED Description .............................................................................................................................. 2
Table 1.2 Performance Figures ...................................................................................................................... 3
Table 1.3 Ordering Information ...................................................................................................................... 3
Table 2.1 RS485 DTE to DCE connection ...................................................................................................... 6
Table 3.1 USB "B" Receptacle Pin-Out........................................................................................................ 11
Table 3.2 DE-9P RS485 Pin-Out .................................................................................................................... 11
Table 4.1 USB Electrical Details ................................................................................................................... 12
Table 4.2 RS485 Electrical Details ............................................................................................................... 12
Table 4.3 Power Output for USB-COM485-Plus1 ........................................................................................ 13
Table 6.1 Storage Temperature .................................................................................................................... 15
Table 6.2 Operating Temperature ................................................................................................................ 15
Table 7.1 Import / Export Information .......................................................................................................... 17
Copyright © 2010 Future Technology Devices International Limited
22
Document Reference No.: FT_000132
USB-COM485-PLUS1 Datasheet
Version 1.21
Clearance No.: FTDI# 95
Appendix B - Revision History
Version Draft
First Draft
2
nd
13 March 2009
Draft
18 March 2009
Version 1.0
text, and update photo of PCB
04 June 2009
Version 1.0
Released
09 June 2009
Version 1.01
Added detail of 120R termination resistor
11 June 2009
Version 1.02
removed debug suggestion to fit a loopback connector
Corrected max power available from 450mA to 250mA
Added section 2.3 for local echo
Version 1.2
Version 1.21
21 Aug 2009
Edited Section 1.3.1, Removed the statement
“A standard “A to B” cable is provided”
12th April 2010
Edited table 1.2, RS485 cable length
06th Oct 2010
Copyright © 2010 Future Technology Devices International Limited
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