US-101-485 USB to RS-422 / 485

1. Introduction

Thank you for your purchase of the US-101-485 as the USB to serial adapter. Featuring USB (Universal Serial Bus) interface technology, it converts USB to RS-485/422, allowing easy adoption for industrial machines with RS-485/422 interfaces. The US-101-485 is compatible with USB V1.0~2.0. Its electrical power is supplied from the USB port, requiring no external power adapter. You can connect a PC USB port or USB hub to the US-101-485 via the USB cable and its High-Speed RS-485/422 serial port, which offers easy connectivity for traditional serial devices in your working environments.

The US-101-485 offers internal surge-protection on RS-485/422's data lines. Internal high-speed transient suppressors on each data line protect the US-101-485 from dangerous voltage levels or spikes.

2. Package Checklist

The US-101-485 product is shipped with the following items:

• 1 unit of US-101-485 USB to RS-485/422 converter
• 1 unit of A type to A type USB cable
• User Operation Manual
• Software CD

NOTE: Notify your sales representative if any of the above items is missing or damaged.

3. Product Specification

Serial Port

RS-485/422

• No. of Ports: 422/485 * 1 Port (Terminal Block)
• RS-422 Signals: RxD+, RxD-, TxD+, TxD- in Full-duplex (Surge Protection)
• RS-485 Signals: Data+, Data- in Half-duplex (Surge Protection)
• Receive buffer: 576 Byte
• Transmit buffer: 640 Byte
• Baud Rate Speed: 300 bps ~ 230.4k bps
• Built-in RS-422/RS-485 Terminal Resistor (Surge Protection)
• Connected Serial port type identification: Auto-Detection
• Built-in Terminal 100 Ohm Terminal resistor SW selection ON/OFF
• 15KV ESD for all signal

USB Port

• No. of Ports: USB * 1 Port
• Chipset: Silicon Laboratories CP2102
• Compatibility: Fully compatible with USB V1.0, V1.2, V2.0
• Connector: USB type A connector
• Baud Rates: Full speed 12 Mbps.

Driver OS Support

• Windows: 98E / 2000 / XP / Server 2003 / Vista
• Mac: osx / os9
• Linux: 2.4 / 2.6

Power

USB bus power as voltage DC +5V

Environment

• Operating Temperature: 0℃ ~ 60℃
• Storage Temperature: -20℃ ~ 85℃

Humidity

5-95% RH

Dimensions

55 * 40 * 25 mm (W * D * H)

WEIGHT

35 gm

Regulatory Approved

• EMC: FCC Class A, CE Class A
• WARRANTY: 9 months

4. Product Panel Views Description

US-101-485 Product Views

Description of the US-101-485 unit: A black rectangular device is shown. Labels indicate:

• USB Type A Connector: Located on the left side of the device.
• Serial I/O Port RS-485/422: Located on the right side of the device.
• Terminator: A switch labeled '1 2' and 'ON/OFF' is located near the serial port.

The top label reads "USB To RS-485/422". Indicators labeled "Power", "TX RX", "485 422" are present. Further labels "R-", "R+", "D-", "D+" are near the serial port terminals. A "RoHS" compliant logo is visible.

USB Type A Connector

Power Outlet: The US-101-485 USB to RS-485/422 is powered by the USB port, providing a single 5V DC (Inner positive/outer negative) power supply and 500mA of current. Connect the USB cable between a PC USB port or USB hub and the US-101-485's USB port. The US-101-485's USB port is a USB Type A connector and is fully compatible with USB V1.1~2.0.

Serial I/O Port

Serial I/O Port of RS-485/422: To connect the serial data cable between the converter and the serial device, follow the parameter setup procedures to configure the converter (refer to the following chapters).

Description of the serial port and terminator: A close-up view shows the terminal block and a switch. Labels indicate:

• Terminator: A switch labeled '1 2' and 'ON' is shown.
• Serial I/O Port RS-485/422: A terminal block with screw terminals for connecting wires.

Terminator: The purpose of the terminator is for compensating signal attenuation in long-distance connections at RS-485/422. If switches 1 & 2 are set in the "ON" position, signal compensation will be activated. To disable this function, push switches 1 & 2 to the opposite position.

LED Indicators

Description of indicators: A close-up view of the top panel shows indicator lights.

• Power LED: Label points to a small LED.
• SYS (Red): Label points to another LED.

SYS (Red): This is a power indicator. The SYS LED will be on when the power is on.

5. US-101-485 Driver Installation

When setting up the US-101-485 adapter for the first time, you must install the CP201x driver, referred to as "US-101-485 Driver", on your computer before connecting the device. Supported operating systems include Windows 98 / XP / 2000 / VISTA, Linux, and Mac. The utility CD is enclosed in the device box. All US-101-485 USB to RS-485/422 Adapters require the driver to be installed before use.

Driver Installation

Before connecting the US-101-485 adapter for the first time, install the driver software on your computer. The US-101-485 driver supports several operating systems, including Windows, Mac, and Linux.

A. Install CP210x_VCP_Win2K_XP software

Use the CD-ROM to find the adaptable OS for your computer equipment.

Description of driver installation screen: A screenshot shows the installer for "CP210x Virtual COM Port Windows 2000/XP Drivers".

B. Choose "Next" Icon

If your computer is running a Windows OS, a pop-up screen titled "CP210x VCP Drivers for Windows 2000/XP on your computer" will appear. Click the "Next" icon to proceed to the next step.

Description of InstallShield Wizard welcome screen: A screenshot shows the welcome screen for the InstallShield Wizard, prompting the user to click "Next" to continue.

C. Choose "Accept” item of license agreement

After reading the license agreement, if you agree to the terms, select the option "I accept the terms of the license agreement".

Description of License Agreement dialog: A screenshot displays the End-User License Agreement, with an option to accept or decline the terms.

D. Choose destination location

This step allows you to select the destination location on your computer for saving the CP201x driver software.

Description of Choose Destination Location screen: A screenshot shows the dialog for selecting the installation folder, with a default path "c:\SiLabs\MCU\CP210x" displayed.

E. Execute the program installation

Click the "Install" icon to begin the installation of the CP210x driver.

Description of Ready to Install the Program screen: A screenshot shows the dialog indicating the wizard is ready to begin installation and prompts the user to click "Install".

F. Install CP210x VCP Driver for Windows 2000/XP

After clicking the "Install" icon, the InstallShield wizard will install the Silicon Laboratories CP210x drivers for Windows 2000/XP to the selected installation location.

Description of installation progress screen: A screenshot shows the installation progress bar and status messages.

G. InstallShield Wizard Complete

The CP201x VCP driver has been successfully installed. Click the "Finish" icon to exit the wizard.

Description of InstallShield Wizard Complete screen: A screenshot shows the completion dialog, prompting the user to click "Finish".

6. US-101-485 Hardware Installation & Setup

Hardware Installation

1. Power on your computer and wait until the OS is ready after booting.
2. A Type A USB cable has two distinct connectors for connecting the cable from a USB device to a computer or USB hub.
3. Connect the USB cable between a PC USB port or USB hub and the US-101-485 adapter.
4. Connect the serial port RS-485/422 equipment to the US-101-485 USB to serial adapter.

Description of USB cable connection: A diagram illustrates a USB Type A port on a computer and a USB Type A connector, showing how they interface.

Description of hardware connection: An image depicts the US-101-485 unit connected via a USB cable to a computer system.

5. After connecting the US-101-485 USB to serial converter, a message such as "New device has been connected" may pop up on the screen. However, the CT201x VCP driver needs to be installed on the PC in advance.
6. The SYS indicator (red LED) will turn on, indicating that the US-101-485 USB to serial adapter is active.

Hardware Setup

Once the US-101-485 adapter has been successfully connected, you can configure more detailed parameters using your computer's management tools.

A. Into "Manage" icon in My Computer

Click the "My Computer" icon, then right-click the mouse. After clicking the "Manage" item on the list bar, the "Computer Management (Local)" window will pop up.

Description of My Computer and Manage selection: Screenshots show the "My Computer" window and the context menu with "Manage" highlighted.

B. Choose "Device Manager" and click "Ports (COM & LPT)" in Device Manager

Click the "Device Manager" item. All devices on the computer will be listed on the right side of the screen. Then, click the "Ports (COM & LPT)" item to find COM devices.

Description of Device Manager: A screenshot displays the Device Manager window with the "Ports (COM & LPT)" section expanded, showing listed COM ports.

C. Detail parameters of CP210x USB to UART Bridge Controller

Click "CP210x USB to UART Bridge Controller" to get more detailed information about the device.

Description of CP210x USB to UART Bridge Controller properties: A screenshot shows the properties window for the CP210x USB to UART Bridge Controller.

D. Device general status of CP210x USB to UART Bridge Controller

This section displays the status of the device and some general product information. The COM port number of the device is also displayed.

Description of General Device Status: A screenshot shows the "General" tab of the CP210x USB to UART Bridge Controller properties, displaying device status and COM port information.

E. "Port Settings" communication detail information

This is used for checking and setting more detailed parameters for device communication.

Description of Port Settings: A screenshot shows the "Port Settings" tab, allowing configuration of parameters like Bits per second, Data bits, Parity, Stop bits, and Flow control.

F. "Driver" detail information

This displays the driver detail information as installed on your computer.

Description of Driver Details: A screenshot shows the "Driver" tab of the CP210x USB to UART Bridge Controller properties, including driver provider, date, version, and options to update or roll back the driver.

G. "Details" item

This is used for checking device ID numbers, such as the device instance ID.

Description of Details Item: A screenshot shows the "Details" tab of the CP210x USB to UART Bridge Controller properties, displaying various hardware IDs and instance paths.

Appendix A: Pin Outs and Connector

USB Layout Diagram

Type A USB Connector

Description of Type A USB Connector: A diagram shows the USB Type A connector and a table detailing pin assignments.

A diagram shows the socket viewed from the front (pins 1-4) and the plug viewed from the front (pins 4-1).

RS-422 Pin Assignment

Description of RS-422 Pin Assignment: The pin assignment scheme for a 4-pin RS-422 is provided.

RS-422: PIN 1: T+, PIN 2: T-, PIN 3: R+, PIN 4: R-

RS-485: PIN 1: D+, PIN 2: D-

A diagram shows pins 1 through 4 for the RS-422 assignment.

RS-422 Wiring Diagram

Description of RS-422 Wiring: A table shows the wiring connections between a Serial Device and the US-101-485 unit.

RS-485 Wiring Diagram

Description of RS-485 Wiring: A table shows the wiring connections between a Serial Device and the US-101-485 unit.