USB to RS-422/485 Adapter`s Manual

USB to RS-422/485 Serial Adapter
User Manual
Ver. 3.00
All brand names and trademarks are properties of their
respective owners.
Contents:
Chapter 1: Introduction ...................................................... 3
1.1 Product Introduction .................................................... 3
1.2 Features........................................................................ 3
1.3 System Requirements .................................................. 4
1.4 Package Contents ......................................................... 4
Chapter 2: Getting Started ................................................. 4
2.1 Hardware Layout ......................................................... 4
2.2 Pin Assignment ............................................................ 9
2.3 Jumper Settings.......................................................... 10
2.4 Driver Installation ...................................................... 11
2.4.1 Installation for Windows XP/Vista/7/8 ............... 11
2.4.2 Installation for Linux 2.6.31 or later ................... 12
2.4.3 Installation for Mac OS X................................... 12
2.4.4 Installation for Windows CE .............................. 12
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Chapter 1: Introduction
1.1 Product Introduction
USB to RS-422/485 Serial Adapter provides an easy way to add
1/2/4 serial ports to your desktop or notebook computer. This USB to
Serial Adapter functions as a converter between a USB port and
standard serial ports. You can easily connect this adapter to the USB
port on your PC or USB hub and get access to any RS-422/485 devices.
This device is suitable for portable devices, and industrial applications.
1.2 Features

Compliant with USB 2.0 specification

Serial communication speeds up to 1Mbps

RS-422 and RS-485 auto detect and switching

±15KV ESD protection on all signal pins

Additional I/O or IRQ not required

LEDs for indicating TxD/RxD activity

Wall mount support

Drivers provided for Windows, Mac OS X and Windows CE
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1.3 System Requirements

Windows® XP/Vista/7/8, Mac OS X, Linux and Windows CE

Available USB port
1.4 Package Contents

1 x USB to RS-422/485 Serial Adapter

1 x Driver CD

1 x User Manual

1 x USB type A-B cable

1 x Power Adapter (Optional)
Note: Contents may vary depending on country/market.
Chapter 2: Getting Started
2.1 Hardware Layout
1-Port USB to RS-422/485 Serial Adapter:
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2-Port USB to RS-422/485 Serial Adapter:
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4-Port USB to RS-422/485 Serial Adapter:
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
Status LED:
1.
Rx – Green, Blink when serial data received
2.
Tx – Yellow, Blink when serial data sent

DIP Switch: RS-422/485 Mode Selector
This USB to RS-422/485 Serial Adapter equips independent DIP
switch for each serial port.
1). Auto RS-422/485 (Default)
This COM can automatically detect the state of RS-422 full duplex or
RS-485 half duplex and control the data transmitting and receiving
wires at the same port.
2). RS-422 (4-Wire RS-485)
This COM port forces to run RS-422 full duplex mode.
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2.2 Pin Assignment
This USB to RS-22/485 Serial Adapter uses male DB9 connectors. Pin
assignments are show in the following
Male DB9 Connector: Device-side Pin Assignments:
Pin
Transmission Signals
RS-422
4-Wire RS-485
2-Wire RS-485
1
Tx-
Tx-
D-
2
Tx+
Tx+
D+
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3
Rx+
Rx+
4
Rx-
Rx-
5
GND
GND
GND
2.3 Jumper Settings
This USB to RS-22/485 Serial Adapter equips independent TX and RX
termination resistors for each serial port. User can modify the jumper
settings (short the pins) to avoid impedance mismatched problem when
operate under Multi-drop transmission. User will need to open up the
metal covers, and set the jumper setting to enable or disable 120 ohms
termination resistors.
Factory default jumper setting is OPEN (disable 120 ohms termination
resistors across the two wires).
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2.4 Driver Installation
2.4.1 Installation for Windows XP/Vista/7/8
1.
Insert the provided CD into your disk drive. The CD-ROM will
start automatically. The following screen will show up and please
click “Install Driver”.
*Note: Actual image may vary
Note: If the install program doesn’t run automatically, please
locate and double-click on the Autorun.exe file in the CD to
launch the install program.
2.
Please click “RS-422/485 USB” to start the installation.
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*Note: Actual image may vary
3.
Follow the instructions on screen to install the driver.
2.4.2 Installation for Linux 2.6.31 or later
Please update to Linux 2.6.31 or above supported. It’s by kernel
support. This is no need driver for kernel 2.6.31 above.
2.4.3 Installation for Mac OS X
Please refer to the installation guide and driver for Mac OS X operation
system installation within the folder located in the CD driver.
:\Driver\USB\Mac OS X
2.4.4 Installation for Windows CE
Please refer to the installation guide and driver for Windows CE
operation system installation within the folder located in the CD driver.
:\Driver\USB\Windows CE
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