DS_USB-COM422-PLUS1_技术文档

Future Technology Devices International Ltd

USB-COM422-PLUS1

Datasheet

Document Reference No.: FT_000131

Version 1.1

Issue Date: 2010-04-12

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

Document Reference No.: FT_000131

USB-COM422-PLUS1 Datasheet

Version 1.1

Clearance No.: FTDI# 94

1 Introduction

1.1 Functional Description

The USB-COM-Plus modules are a family of communication devices. This model, USB-COM422-Plus1,

provides a simple method of adapting legacy serial devices with RS422 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-COM422-PLUS1 utilise the FTDI FT232R and includes RS422 level

shifters plus TXD/RXD LEDs to provide a visual indication of data traffic through the module.

Figure 1.1 USB-COM422-Plus1

The module uses a standard USB-B device connector for connection to an upstream host or hub port.

RS422-level signals, including modem handshake signals, are available on an industry-standard DE-9P

connector. The maximum RS422-level data rate is 3Mbps.

The USB-COM422-Plus1 module requires USB device drivers, available free from www.ftdichip.com, which

are used to make the USB-COM422-Plus1 appear as a Virtual COM Port (VCP). This allows existing serial

communications software, such as HyperTerminal, to exchange data through the USB-COM422-Plus1 to a

legacy RS422 peripheral device.

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1.2 LED Description

The USB-COM422-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-COM422-Plus1 is configured and ready

Flashes when data is transmitted from the USB-COM422-Plus1 to the

attached RS422 device

TxD Activity

RxD Activity

Green

Red

Flashes when data is transmitted from the attached RS422 device to the

USB-COM422-Plus1

Table 1.1 LED Description

1.3 Block Diagram

USB B

Client

Connector

FTDI FT232R

USB Serial Bridge

RS422

Level Shifter

DE-9P

Connector

Figure 1.2 USB-COM422-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.

RS422 Level Shifter

The RS422 level shifter converts the signals provided by the FT232R into the voltage levels required by

RS422 devices.

DE-9P Connector (Male)

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

RS422 peripherals through standard cables. See section 3.1.2

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1.4 Features

Adds one RS-422 serial port by connecting to USB

Easy plug & play installation and RS-422 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

FIFO: 128 byte transmit buffer, 256 byte receive buffer

RS-422 data signals: TxD+, TxD-, RxD+, RxD-, RTS+, RTS-, CTS+, CTS-, GND

Powered by USB port. No external power adapter required.

Serial port speed up to 3Mbps

Serial Communication Parameters

o

Parity: None, Even, Odd

Data bits: 7, 8

Flow control: RTS/CTS , X-ON/X-OFF, 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)

Custom baud rates (300bps to 3Mbps) through baud rate aliasing. See

FTDI Application Note: Configuring FT232R, FT2232 and FT232BM Baud

Rates

RS422 Interface

Max Cable Length

USB=5m, RS422=12m

Table 1.2 Performance Figures

Part Number

Description

USB-COM-Plus Full-Speed USB to 1-Port RS422 module

USB-COM422-Plus1

Table 1.3 Ordering Information

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

1.1

1.2

1.3

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

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

Block Diagram...............................................................................................2

1.3.1

Block description ....................................................................................... 2

Features........................................................................................................3

Performance Figures.....................................................................................3

1.4

1.5

2 Installation..................................................................................... 6

2.1

Example Applications and Configurations .....................................................6

2.1.1

Wiring...................................................................................................... 6

2.2

Device Driver Installation .............................................................................6

2.2.1

2.2.2

Microsoft Windows..................................................................................... 6

Mac OS X, Linux, Windows CE................................................................... 10

3 Connections.................................................................................. 11

3.1

3.1.1

3.1.2

External Connectors.................................................................................... 11

USB....................................................................................................... 11

RS422.................................................................................................... 11

4 Electrical details........................................................................... 12

4.1

4.2

USB ............................................................................................................. 12

RS422 ......................................................................................................... 12

5 Mechanical Details........................................................................ 13

5.1

Module Mechanical Dimensions................................................................... 13

6 Physical Environment Details ....................................................... 14

6.1

6.2

Storage ....................................................................................................... 14

Operating.................................................................................................... 14

7 Environmental Approvals & Declarations...................................... 15

7.1

7.2

7.3

7.4

EMI Compatibility........................................................................................ 15

Safety.......................................................................................................... 15

Environmental............................................................................................. 15

Reliability.................................................................................................... 15

7.4.1

MTTF ..................................................................................................... 15

7.5

Import / Export Information....................................................................... 15

8 Troubleshooting ........................................................................... 17

8.1

8.2

8.3

Hardware .................................................................................................... 17

Device Driver .............................................................................................. 17

Technical Support ....................................................................................... 18

9 Contact Information ..................................................................... 19

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Appendix A - List of Figures and tables .............................................. 21

Appendix B - Revision History............................................................ 22

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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-COM422-Plus1.

The USB-COM422-Plus1 follows EIA-422 standard as a Data Terminal Equipment (DTE) device. If the

RS422 equipment being connected is a Data Communication Equipment (DCE) device, it’s typical that a

straight-through cable can be used.

DTE Pin Number

1

Signal Name

Expected Connect Signal

RXD-

TXD- = Transmit Data,

negative polarity

2

3

4

TXD+ = Transmit Data,

positive polarity

RXD+

TXD+

TXD-

RXD+ = Receive Data,

positive polarity

RXD- = Receive Data,

negative polarity

5

6

GND = signal ground

GND

CTS-

RTS- = Request To Send,

negative polarity

7

8

9

RTS+ = Request To Send,

positive polarity

CTS+

RTS+

RTS-

CTS+ = Clear To Send,

positive polarity

CTS- = Clear To Send,

negative polarity

Table 2.1 RS422 DTE to DCE connection with straight-through cable

Some serial devices may require certain handshake signals be connected. Refer to your device manual

for cabling details.

2.2 Device Driver Installation

The USB-COM422-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

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connecting the USB-COM422-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-COM422-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-COM422-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 2.1 Hardware Ready

Windows Update shown on Windows XP

You must have an active Internet connection and the Windows Update Service enabled.

1) Connect the USB-COM422-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 2.2 Found New Hardware Wizard

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

4) The following screen appears:

Figure 2.3 Automatic Install

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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 2.4 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 2.5 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 2.6 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 COMn assignment. In the figure below, the USB-COM422-Plus1 is assigned to COM3.

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Figure 2.7 COM Port Assignment

Use this COM port number with your application software in order to access the USB-COM422-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 2.8 Access COM Port Properties

Next, click on the “Port Settings” tab.

Figure 2.9 Settings Tab

Then click on the “Advanced…” button.

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Figure 2.10 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.

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.

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3 Connections

3.1 External Connectors

3.1.1 USB

The USB-COM422-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

VBUS = USB Power provided from upstream USB Host or Hub

D– = USB data signal, negative polarity

D+ = USB data signal, positive polarity

GND = USB signal ground

Bidirectional

Ground

2

3

4

Shield

Case Ground

Drain = typically connected to the host PC case

Table 3.1 USB "B" Receptacle Pin-Out

3.1.2 RS422

The RS422 port is configured as Data Terminal Equipment (DTE), with a 9-contact D-Sub Pin connector.

Pin assignments are according to TIA/EIA-422.

Pin Number

Pin Type

Description

1

2

3

4

5

6

7

8

9

Output

Input

TXD- = Transmit Data, negative polarity

TXD+ = Transmit Data, positive polarity

RXD+ = Receive Data, positive polarity

RXD- = Receive Data, negative polarity

GND = signal ground

Input

Ground

Output

Input

RTS- = Request To Send, negative polarity

RTS+ = Request To Send, positive polarity

CTS+ = Clear To Send, positive polarity

CTS- = Clear To Send, negative polarity

Input

Table 3.2 DE-9P RS422 Pin-Out

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4 Electrical details

4.1 USB

Parameter

USB_VCC

I_cc

Description

Minimum

4.25

Typical

5.0*

30

Maximum

5.25

Units

V

Conditions

*Present when USB

cable is attached and

USB Host or Hub

powered.

Input Power Voltage*

USB current

50

mA

Table 4.1 USB Electrical Details

4.2 RS422

Parameter

Description

Minimum

-7

Typical

+12

Maximum

Units

Conditions

Receiver Input

VCM

IN

Common-mode input

voltage range

V

VIN = +12V

VIN = -7V

Input Current

1.0

mA

-0.8

Differential Threshold

Voltage

+0.2

V

VTH

VIHYST

-0.2

12

Input Hysteresis

mV

kΩ

20

15

Input Resistance, RIN

RIN

Transmitter Output

Differential Output

Voltage,

With RL = 54Ω.

5

V

VOD

ESD Tolerance

ESD HBM

1.5

CL = 50pF *

RS-422 Inputs and

Outputs

kV

±15

±8

RS-422 Inputs and

Outputs

EN61000-4-2

Contact Discharge

RS-422 Inputs and

Outputs

EN61000-4-2 Air

Gap Discharge

±15

Table 4.2 RS422 Electrical Details

* - The 54 ohms is the equivalent of two 120 ohm termination resistors placed on each side of the

transmission line and the input impedance of 32 receivers on the line.

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5 Mechanical Details

5.1 Module Mechanical Dimensions

18 mm

32 mm

30 mm

27 mm

13 mm

12 mm

37 mm

Figure 5.1 USB-COM422-Plus1 PCB Dimensions

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6 Physical Environment Details

6.1 Storage

Parameter Description

Minimum

Typical

Maximum

+150

Units

Conditions

Storage Temperature

Range

T

-65

^oC

Table 6.1 Storage Temperature

6.2 Operating

Parameter Description

Minimum

Typical

Maximum

+85

Units

^oC

Conditions

Operating Temperature

5% to 95% RH,

non condensing

T

–40

Range

Table 6.2 Operating Temperature

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7 Environmental Approvals & Declarations

7.1 EMI Compatibility

FCC and CE

The USB-COM422-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-COM422-Plus1 is defined as Limited Power Supply (LPS) device, with operating voltages under

60VDC.

7.3 Environmental

The USB-COM422-Plus1 is a lead-free device that complies with the following environmental directives:

RoHS, WEEE, REACH, PFOS and DecaBDE.

7.4 Reliability

The USB-COM422-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.

7.5 Import / Export Information

Import / Export Information

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Country of Origin

Harmonized Code

China

TBD

Product Description USB to RS422 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.

RS422 cables – check the following:

-

Output signals (TXD+, TXD-, RTS+, RTS-) are connected to the respective inputs (RXD+, RXD-,

CTS+, CTS-) in each direction.

-

Check for specific handshake requirements of your RS422 peripheral.

If handshake signals are not used, ensure the application is set to “No Hardware Handshake”, or

equivalent.

-

Test the port with a loop-back connector. Connect TXD+ to RXD+, TXD- to RXD-, RTS+ to CTS+ and

RTS- to CTS-. 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 RS422

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 RS422 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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8.3 Technical Support

Technical support may be obtained from your nearest FTDIChip office:

United Kingdom:

United States:

China:

support1@ftdichip.com

us.support@ftdichip.com

cn.support@ftdichip.com

tw.support1@ftdichip.com

Taiwan

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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

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Appendix A - List of Figures and tables

List of Figures:

Figure 1.1 USB-COM422-Plus1....................................................................................................................... 1

Figure 1.2 USB-COM422-Plus1 Block Diagram ............................................................................................ 2

Figure 2.1 Hardware Ready ............................................................................................................................ 7

Figure 2.2 Found New Hardware Wizard....................................................................................................... 7

Figure 2.3 Automatic Install............................................................................................................................ 7

Figure 2.4 Complete Hardware Installation................................................................................................... 8

Figure 2.5 Hardware Ready ............................................................................................................................ 8

Figure 2.6 Device Manager ............................................................................................................................. 8

Figure 2.7 COM Port Assignment .................................................................................................................. 9

Figure 2.8 Access COM Port Properties........................................................................................................ 9

Figure 2.9 Settings Tab ................................................................................................................................... 9

Figure 2.10 Advanced Options..................................................................................................................... 10

Figure 5.1 USB-COM422-Plus1 PCB Dimensions ...................................................................................... 13

List of tables:

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

Table 1.2 Performance Figures ...................................................................................................................... 3

Table 1.3 Ordering Information ...................................................................................................................... 3

Table 2.1 RS422 DTE to DCE connection with straight-through cable...................................................... 6

Table 3.1 USB "B" Receptacle Pin-Out........................................................................................................ 11

Table 3.2 DE-9P RS422 Pin-Out.................................................................................................................... 11

Table 4.1 USB Electrical Details................................................................................................................... 12

Table 4.2 RS422 Electrical Details ............................................................................................................... 12

Table 6.1 Storage Temperature.................................................................................................................... 14

Table 6.2 Operating Temperature ................................................................................................................ 14

Table 7.1 Import / Export Information.......................................................................................................... 16

21

Document Reference No.: FT_000131

USB-COM422-PLUS1 Datasheet

Version 1.1

Clearance No.: FTDI# 94

Appendix B - Revision History

Version Draft

First Draft

13 March 2009

18 March 2009

04 June 2009

09 June 2009

2^ndDraft

Version 1.0

Version 1.1

Remove IEC60601 text, and update photo of PCB

Released

Edited Section 1.3.1, Removed the statement

“A standard “A to B” cable is provided”

12^thApril 2010

22


型号：	DS_USB-COM422-PLUS1
厂家：	ETC
描述：	Future Technology Devices International Ltd 未来技术设备国际有限公司
文件：	总23页 (文件大小：678K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

DS_USB-COM422-PLUS1 [ETC]

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