FTDI, Future Technology Devices International Ltd 的 USB-COM485-PLUS4 规格书

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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

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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

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Glasgow, G41 1HH, United Kingdom. Scotland Registered Number: SC136640

Future Technology Devices International Ltd

USB-COM485-PLUS4

Datasheet

Document Reference No.: FT_000153

Version 1.2

Issue Date: 2010-04-12

FTDI mm 4 Datasheel Chip Version 1.2 Clearance No.: FTDH! 108 www‘ﬂtdic p.com

Document Reference No.: FT_000153

USB-COM485-PLUS4 Datasheet

Version 1.2

Clearance No.: FTDI# 108

1 Introduction

1.1 Functional Description

The USB-COM485-PLUS4 is a USB to a quad interface RS485 level serial UART adaptor incorporating

FTDI’s FT4232H Hi-Speed USB2.0 (480Mb/s) to quad serial UART interface IC device. The FT4232H

handles all the USB signalling and protocols. The adaptor provides a fast, simple way to connect devices

with an RS485 interface to USB.

USB-COM485-PLUS4 is a USB to a quad-port RS485 adapter.

The integrated electronics of the USB-COM485-PLUS4 utilise the FTDI FT2232H 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-PLUS4

The module uses a standard USB mini-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 10Mbps.

The USB-COM485-PLUS4 module requires USB device drivers, available free from www.ftdichip.com,

which are used to make the USB-COM485-PLUS4 appear as a Virtual COM Port (VCP). This allows existing

serial communications software, such as HyperTerminal, to exchange data through the USB-COM485-

PLUS4 to a legacy RS485 peripheral device.

"- FTDI .: FT_000153 4 Datasheet , _ Chlp Version 1.2 Clearance No.: FTDI# 108 ,w‘n.

Document Reference No.: FT_000153

USB-COM485-PLUS4 Datasheet

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1.2 LED Description

The USB-COM485-PLUS4 uses 9 LEDs to indicate a valid link as well as data traffic according to the

following table:

LED Colour

Function

Description

Yellow x 1

Power

ON when USB-COM485-PLUS4 is configured and ready

Red x 4

TxD Activity

Flashes when data is transmitted from the USB-COM485-PLUS4 to the

attached RS485 device

Green x 4

RxD Activity

Flashes when data is transmitted from the attached RS485 device to the

USB-COM485-PLUS4

Table 1.1 – LED Description

f'.’ FTDI .: FT_000153 3 Ch 4 Datasheet \ ' Version 1.2 . _ If.) clearance No.: mm: 108 USB Mini B Client Connector FTDI FT4232H Quad R5485 Level Shifter DE-9P Connector (Male)

Document Reference No.: FT_000153

USB-COM485-PLUS4 Datasheet

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1.3 Block Diagram

FTDI FT4232H

High-Speed

USB Serial Bridge

USB miniB

Client

Connector

Channel A Channel B

RS485

Level Shifter

DE-9P

Connector

A

Channel CChannel D

RS485

Level Shifter

DE-9P

Connector

B

RS485

Level Shifter

DE-9P

Connector

C

RS485

Level Shifter

DE-9P

Connector

D

Figure 1.2 USB-COM485-PLUS4 Block Diagram

1.3.1 Block description

USB Mini 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 FT4232H

FT4232H Hi-Speed USB2.0 (480Mb/s) is a quad serial UART interface IC device. Operating system device

drivers are required in order to operate with the FT4232H in order to provide the Virtual COM Port serial

functionality.

Quad RS485 Level Shifter

The RS485 level shifter converts the signals provided by the FT4232H into the voltage levels required by

RS485 devices.

DE-9P Connector (Male)

The DE-9P connectors are configured in an industry standard (TIA/EIA-574) pin-out to provide connection

to RS485 peripherals through standard cables. See section 3.1.2

v ‘x \ FTDI Chip .: FT_000153 4 Datasheet Version 1.2 Clearance No.: FTDI# 108 Baud Rates Configurmg FT23ZR FTZZSZ and FF23ZBM

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USB-COM485-PLUS4 Datasheet

Version 1.2

Clearance No.: FTDI# 108

1.4 Features

Adds four RS-485 serial ports by connecting to a USB 2.0 Hi-Speed interface.

Easy plug & play installation and RS-485 device connection

Operates 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 ports

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, Windows CE, Linux, Mac OS X

FIFO: 2K byte transmit buffer, 2K byte receive buffer

RS-485 data signals: Data+, Data-, GND

Powered by USB port. No external power adapter required. +5V output available.

Serial port speed up to 10Mbps

Serial Communication Parameters

o Parity: None, Even, Odd

o Data bits: 7, 8

o Flow control: X-ON/X-OFF, None

Four DE-9P male connectors

LEDs indicate USB Enumeration, RxD, TxD for monitoring port status & easy diagnostics

Operating temperature of -40°C to +85°C

Echo and non-Echo two modes can be selected.

1.5 Performance Figures

Parameter

Performance

USB Interface

480Mbps USB 2.0 High-Speed

RS485 Interface

Standard Windows baud rates (300bps to 921.6Kbps)

Custom baud rates (300bps to 10Mbps) through baud rate aliasing.

See FTDI Application Note: Configuring FT232R, FT2232 and FT232BM

Baud Rates

Max Cable Length

USB = 5m, RS485 =12m (at 10Mbps)

Table 1.2 - Performance Figures

Part Number

Description

USB-COM485-PLUS4

USB-COM-Plus Hi-Speed USB to 4-Port RS485 module

Table 1.3 - Ordering Information

4 Datasheet ‘ chip Version 1.2 Clearance No.: FTDI” 108 7,: FTDI .: FT_000153 § \

Document Reference No.: FT_000153

USB-COM485-PLUS4 Datasheet

Version 1.2

Clearance No.: FTDI# 108

1 Introduction ................................................................................... 1

1.1 Functional Description .................................................................................. 1

1.2 LED Description ............................................................................................. 2

1.3 Block Diagram ............................................................................................... 3

1.3.1 Block description ....................................................................................... 3

1.4 Features ........................................................................................................ 4

1.5 Performance Figures ..................................................................................... 4

2 Installation ..................................................................................... 7

2.1 Example Applications and Configurations ..................................................... 7

2.1.1 Wiring ...................................................................................................... 7

2.2 Device Driver Installation ............................................................................. 9

2.2.1 Microsoft Windows ..................................................................................... 9

2.2.2 Mac OS X, Linux, Windows CE ................................................................... 14

3 Connections .................................................................................. 15

3.1 External Connectors .................................................................................... 15

3.1.1 USB ....................................................................................................... 15

3.1.2 RS485 .................................................................................................... 15

4 Electrical details ........................................................................... 16

4.1 USB ............................................................................................................. 16

4.2 RS485 ......................................................................................................... 16

4.3 Power Output .............................................................................................. 16

5 Mechanical Details ........................................................................ 17

5.1 Module Mechanical Dimensions ................................................................... 17

6 Physical Environment Details ....................................................... 18

6.1 Storage ....................................................................................................... 18

6.2 Operating .................................................................................................... 18

7 Environmental Approvals & Declarations ...................................... 19

7.1 EMI Compatibility ........................................................................................ 19

7.2 Safety.......................................................................................................... 19

7.3 Environmental ............................................................................................. 19

7.4 Reliability .................................................................................................... 19

7.4.1 MTTF ..................................................................................................... 19

7.5 Import / Export Information ....................................................................... 20

8 Troubleshooting ........................................................................... 21

8.1 Hardware .................................................................................................... 21

8.2 Device Driver .............................................................................................. 21

9 Contact Information ..................................................................... 22

4 Datasheet ‘ chip Version 1.2 Clearance No.: FTDI” 108 7,: FTDI .: FT_000153 § \

Document Reference No.: FT_000153

USB-COM485-PLUS4 Datasheet

Version 1.2

Clearance No.: FTDI# 108

10 Appendix A - List of Figures and tables......................................... 24

Appendix B - Revision History ............................................................ 25

4 Datasheet chip Version 1.2 Clearance No.: FTDI” 108 7,: FTDI .: FT_000153 { ‘ R10 110R Datab- Dml -

Document Reference No.: FT_000153

USB-COM485-PLUS4 Datasheet

Version 1.2

Clearance No.: FTDI# 108

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 mini B-plug into the mini B-

receptacle on the USB-COM485-PLUS4.

DTE Pin Number

Signal Name

Expected Connect Signal

1

DATA- = Transmit/Receive

Data, negative polarity

Also Terminator 2

DATA-

Pin 2 of 120R Terminating Resistor. Only Required if the USB-

COM485-PLUS4 is the first or last device in a multi-drop RS485

System, to meet RS485 Termination Requirements.

2

DATA+ = Transmit/Receive

Data, positive polarity

DATA+

3

Terminator 1

Pin 1 of 120R Terminating Resistor. Only Required if the USB-

COM485-PLUS4 is the first or last device in a multi-drop RS485

System, to meet RS485 Termination Requirements.

4

N/A

5

GND = signal ground

GND

6

N/A

7

echo disable terminal 1

Local echo function control. Connect pin7 and pin 8 can disable

the local echo function. The local echo is enabled by default.

8

echo disable terminal 2

Local echo function control. Connect pin7 and pin 8 can disable

the local echo function. The local echo is enabled by default.

9

PWR = +5V DC output

PWR

Table 2.1 – RS485 DTE to DCE connection

Figure 2.1 USB-COM485-PLUS4 Termination resistor.

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Document Reference No.: FT_000153

USB-COM485-PLUS4 Datasheet

Version 1.2

Clearance No.: FTDI# 108

Figure 2.2 USB-COM485-PLUS4 echo disable

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Document Reference No.: FT_000153

USB-COM485-PLUS4 Datasheet

Version 1.2

Clearance No.: FTDI# 108

2.2 Device Driver Installation

The USB-COM485-PLUS4 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-PLUS4 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-PLUS4 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-PLUS4 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 2.3 - 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-PLUS4 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 2.4 – Found New Hardware Wizard

3) Select one of the “Yes” choices and click “Next”.

4) The following screen appears:

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Document Reference No.: FT_000153

USB-COM485-PLUS4 Datasheet

Version 1.2

Clearance No.: FTDI# 108

Figure 2.5 – Automatic Install

5) Wait while the driver is found, downloaded, and installed. This step may take a couple minutes.

6) After the files are found and installed, click “Finish” to complete the installation.

Figure 2.6 - 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. You must install the Virtual COM Port layer four times, because the USB-

COM485-Plus4 has four Virtual COM Ports.

8) When both portions of the device driver have been installed successfully, the following message

will appear, indicating that the device is ready.

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Document Reference No.: FT_000153

USB-COM485-PLUS4 Datasheet

Version 1.2

Clearance No.: FTDI# 108

Figure 2.7 - Hardware Ready

COM Port Assignment

Next, to determine which COM port has been assigned, open the Windows Device Manager from the

System Control Panel.

Figure 2.8 - Device Manager

Click on the Plus “+” sign next to the Ports tree and Universal Serial Bus controllers tree to list the

available USB device. You will see four additional “USB Serial Port”, followed by a COMn assignment.

And four additional “USB Serial Converter A” ,“USB Serial Converter B” ,“USB Serial Converter C” and

“USB Serial Converter D”.

Figure 2.9 - COM Port and USB Device name Assignment

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Document Reference No.: FT_000153

USB-COM485-PLUS4 Datasheet

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Clearance No.: FTDI# 108

To determine which COM port has been assigned to Converter A, B, C or D, the cursor point to the USB

Serial Port (COM5), (COM6), (COM7), (COM8), then right-click on it and select “Properties”, it shows their

relationship to the Converter A, B, C or D.

In the figure below, the Converter A is assigned to COM5, Converter B is assigned to COM6, Converter C

is assigned to COM7 and Converter D is assigned to COM8.

Figure 2.10 – COM Port Assignment and Proterties

Use this COM port number with your application software in order to access the USB-COM485-PLUS4.

If an application requires use of a different COM port number, the assignment may be changed through

the Advanced Driver Options settings.

From the above “Properties”, click on the “Port Settings” tab.

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Figure 2.11 - Settings Tab

Then click on the “Advanced…” button.

Figure 2.12 - 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 Datasheet ‘ chip Version 1.2 Clearance No.: FTDI” 108 7,: FTDI .: FT_000153 § \

Document Reference No.: FT_000153

USB-COM485-PLUS4 Datasheet

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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.

"- FTDI .: FT_000153 4 Datasheet , _ Chlp Version 1.2 Clearance No.: FTDI# 108 ,w‘n. mounted inside the USB-CDM4BS-PLUS4 to facilitate connection to an upstream USB Host or Hubi enumerated by the system.

Document Reference No.: FT_000153

USB-COM485-PLUS4 Datasheet

Version 1.2

Clearance No.: FTDI# 108

3 Connections

3.1 External Connectors

3.1.1 USB

The USB-COM485-PLUS4 is a downstream USB 2.0 Device. A standard USB “mini B” receptacle is

mounted inside the USB-COM485-PLUS4 to facilitate connection to an upstream USB Host or Hub.

Pin Number

Pin Type

Description

1

Power

VBUS = USB Power provided from upstream USB Host or Hub

2

Bidirectional

D– = USB data signal, negative polarity

3

Bidirectional

D+ = USB data signal, positive polarity

4

ID

No connected

5

Ground

GND = USB signal ground

Shield

Case Ground

Drain = typically connected to the host PC case

Table 3.1 – USB " mini B" Receptacle Pin-Out

3.1.2 RS485

The RS485 ports are 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 DB9 provides +5VDC to

an external device with a maximum current draw of 450mA once the USB-COM485-PLUS4 has been

enumerated by the system.

Pin Number

Pin Type

Description

1

Input/Output

DATA-

Pin 2 of 120R Terminating Resistor. Only Required if the USB-

COM485-PLUS4 is the first or last device in a multi-drop RS485

System, to meet RS485 Termination Requirements.

2

Input/Output

DATA+

3

Input

Pin 1 of 120R Terminating Resistor. Only Required if the USB-

COM485-PLUS4 is the first or last device in a multi-drop RS485

System, to meet RS485 Termination Requirements.

4

N/A

5

GND = signal ground

GND

6

N/A

7

Input

Local echo function control input pin. Connect pin7 and pin 8

can disable the local echo function. The local echo is enabled

by default.

8

Output

Local echo function control output pin. Connect pin7 and pin 8

can disable the local echo function. The local echo is enabled

by default.

9

PWR = +5V DC output

PWR

Table 3.2 – DE-9P RS485 Pin-Out

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Document Reference No.: FT_000153

USB-COM485-PLUS4 Datasheet

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4 Electrical details

4.1 USB

Parameter

Description

Minimum

Typical

Maximum

Units

Conditions

USB_VCC

Input Power Voltage*

4.25

5.0*

5.25

V

*Present when USB

cable is attached and

USB Host or Hub

powered.

Icc

USB current***

30

50

mA

***Does not include

power supplied to

external device

connected to pin 9

Table 4.1 - USB Electrical Details

4.2 RS485

Parameter

Description

Minimum

Typical

Maximum

Units

Conditions

Vtrans

Transmitter output

voltage swing

2

V

RL = 50R CL = 50pF

Vrec

Receiver input voltage

range

-7

+12

V

RL = 50R CL = 50pF

ESD HBM

N/A

±15

KV

For all RS-485 Inputs

and Outputs pin

Table 4.2 – RS485 Electrical Details

4.3 Power Output

The USB-COM485-PLUS4 provides +5V DC for an external device that requires power on pin9 of DB9.

The maximum allowable current is 500mA, including the circuitry of the USB-COM485-PLUS4 itself. Up to

250mA (total output on all 4 ports) may be used by the external device. The +5V output is only enabled

when the USB interface is not in suspend.

Parameter

Description

Minimum

Typical

Maximum

Units

Conditions

IO

Output Power Current

0

250

mA

USB interface is not in

SUSPEND. This is the

total current available

on all 4 ports

Table 4.3 - Power Output for USB-COM485-PLUS4

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Document Reference No.: FT_000153

USB-COM485-PLUS4 Datasheet

Version 1.2

Clearance No.: FTDI# 108

5 Mechanical Details

5.1 Module Mechanical Dimensions

Dimensions are in mm. The height of the module is dominated by the 4 D-type connectors and stands

12.8mm +/- 1mm. The D-type pins protrude below the PCB by 2.54mm +/-1mm

Figure 5.1 - USB-COM485-PLUS4 PCB Dimensions

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Document Reference No.: FT_000153

USB-COM485-PLUS4 Datasheet

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6 Physical Environment Details

6.1 Storage

Parameter

Description

Minimum

Typical

Maximum

Units

Conditions

T

Storage Temperature

Range

-65

+150

oC

Table 6.1 - Storage Temperature

6.2 Operating

Parameter

Description

Minimum

Typical

Maximum

Units

Conditions

T

Operating Temperature

Range

–40

+85

oC

5% to 95% RH,

non condensing

Table 6.2 - Operating Temperature

FTDI mama 4 Datasheet chip Version 1.2 Clearance No.: FTDI” 108

Document Reference No.: FT_000153

USB-COM485-PLUS4 Datasheet

Version 1.2

Clearance No.: FTDI# 108

7 Environmental Approvals & Declarations

7.1 EMI Compatibility

FCC and CE

The USB-COM485-PLUS4 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-PLUS4 is defined as Limited Power Supply (LPS) device, with operating voltages under

60VDC.

7.3 Environmental

The USB-COM485-PLUS4 is a lead-free device that complies with the following environmental directives:

RoHS, WEEE, REACH, PFOS and DecaBDE.

7.4 Reliability

The USB-COM485-PLUS4 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.

" FTDI .: FT_ooo153 . 4 Datasheet Chlp Verslon 1.2 Clearance No.: FTDI# 108 v \

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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, Four COM PortS

USA ECCN

EAR99 – No License Required

Table 7.1 - Import / Export Information

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USB-COM485-PLUS4 Datasheet

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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 not handshake signals, ensure the application is set to “No Hardware Handshake”,

or equivalent.

- Test the port with a loop-back connector. Connect DATA+ to DATA+, DATA- to DATA-. Use a simple

terminal program to check that data is transmitted and received.

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.

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USB-COM485-PLUS4 Datasheet

Version 1.2

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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 – 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 – 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 – 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.

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10 Appendix A - List of Figures and tables

List of Figures:

Figure 1.1 USB-COM485-PLUS4 ..................................................................................................................... 1

Figure 1.2 USB-COM485-PLUS4 Block Diagram .......................................................................................... 3

Figure 2.1 USB-COM485-PLUS4 Termination resistor. ................................................................................ 7

Figure 2.2 USB-COM485-PLUS4 echo disable .............................................................................................. 8

Figure 2.3 - Hardware Ready .......................................................................................................................... 9

Figure 2.4 – Found New Hardware Wizard .................................................................................................... 9

Figure 2.5 – Automatic Install ....................................................................................................................... 10

Figure 2.6 - Complete Hardware Installation .............................................................................................. 10

Figure 2.7 - Hardware Ready ........................................................................................................................ 11

Figure 2.8 - Device Manager ......................................................................................................................... 11

Figure 2.9 - COM Port and USB Device name Assignment ....................................................................... 11

Figure 2.10 – COM Port Assignment and Proterties .................................................................................. 12

Figure 2.11 - Settings Tab ............................................................................................................................. 13

Figure 2.12 - Advanced Options ................................................................................................................... 13

Figure 5.1 - USB-COM485-PLUS4 PCB Dimensions .................................................................................. 17

List of tables:

Table 1.1 – LED Description ........................................................................................................................... 2

Table 1.2 - Performance Figures .................................................................................................................... 4

Table 1.3 - Ordering Information .................................................................................................................... 4

Table 2.1 – RS485 DTE to DCE connection ................................................................................................... 7

Table 3.1 – USB " mini B" Receptacle Pin-Out ........................................................................................... 15

Table 3.2 – DE-9P RS485 Pin-Out ................................................................................................................. 15

Table 4.1 - USB Electrical Details ................................................................................................................. 16

Table 4.2 – RS485 Electrical Details ............................................................................................................ 16

Table 4.3 - Power Output for USB-COM485-PLUS4 ................................................................................... 16

Table 6.1 - Storage Temperature .................................................................................................................. 18

Table 6.2 - Operating Temperature .............................................................................................................. 18

Table 7.1 - Import / Export Information ........................................................................................................ 20

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Appendix B - Revision History

Version 1.0 First release 14th September 2009

Version 1.1 Modified the description of Echo function 24th January 2010

Version 1.2 Edited Section 1.3.1, Removed the statement

“A standard “A to B” cable is provided” 12th April 2010

FTDI, Future Technology Devices International Ltd 的 USB-COM485-PLUS4 规格书

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