USB to Dual Serial RS-422 / RS-485 Industrial Adapter

Model No. USB-2COMi-M

USB to RS485 2-Port Serial Adapter

Support for your existing RS422 and RS485 serial devices doesn’t disappear because your new computer doesn’t have serial ports. The USB-2COMi-M USB to Dual Serial Adapter supports 2 DB9 high speed communication with 128 byte FIFO, Terminal Block and 2-pin DIP Switch mode control.

  • Adds 2 versatile RS422 and RS485 Serial ports to your system.
  • 2-Pin DIP Switch mode control for serial signal.
  • COM port assignment can be changed to any COM port number needed.
  • Automatic transmit and receive control for 2-wire RS-485 half-duplex mode

$197.95

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Model No. USB-2COMi-M

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Units Discount Price
1 - 4 $197.95
5 - 11 3 % $192.01
12 - 24 5 % $188.05
25 - 49 7 % $184.09
50+ 10 % $178.16
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Description

Introduction:

The combination of USB and Serial technology allows more versatility in the use of RS422, and RS485 serial devices to further the expansion of existing networks, even when the computer doesn’t offer serial ports. The USB to Dual Serial Hi-Speed adapter with the 128 byte FIFO allows communication, even in heavily loaded systems.

USB-2COMI-M DIP Switch Control

The USB-2COMi-M USB to Dual Serial provides two DB9 male connectors & two 6-pin terminal block connectors (pictured above) for optimal flexibility of serial connection. The USB-2COMi-M also allows mode control with its 2-pin DIP Switches (not shown), the unique features help to reduce the system load. The serial port also allows unusual speed settings like 500.000bps.

Features:

  • No need to open chassis to set operation modes-two external DIP switches for easy RS-422, RS-485 mode settings
  • Installed as standard Windows COM port
  • SECC metal chassis with DIN rail bracket
  • RS-422 data signals: TxD-, TxD+, RxD+, RxD-, GND, RTS-, RTS+, CTS+, CTS-
  • RS-485 4-wire data signals: TxD-, TxD+, RxD+, RxD-
  • RS-485 2-wire data signals: Data-, Data+
  • Automatic transmit and receive control for 2-wire RS-485 half-duplex mode
  • Built-in termination and biasing
  • High speed serial port with the baud rate up to 921.6K bps
  • Non-standard baudrates supported
  • LEDs of Power, TxD and RxD for easy port monitoring and diagnostics
  • Powered by USB port, no external power adapter required
  • Easy plug and play installation and RS-422/RS-485 device connection
  • COM port number assigned can be changed to any COM port number required
  • Works with USB 1.1 & 2.0 host port
  • Item Dimensions: 115 x 84 x 25 mm ( W x L x H ), 137 x 84 x 25 mm with DB9 connector and ears

OS Support

  • Windows XP, Vista, Windows 7, Windows 8, and 10
  • Linux and Mac OS 10.X

Package Contents:

  • USB to Dual Serial RS-422 / RS-485 Industrial Adapter
  • Din Rail mounting plates and screws
  • USB A to B Cable
  • Driver Disc

*Surface Mounting screws not included.

Specifications

Product Specifications

Compliance
Country of Origin

Taiwan

Physical Characteristics
Color

Black

Mounting Style

Din-Rail, Surface Mount

Ports

2 Serial Ports

Screw Lock Compatible

Yes

Serial Attributes
Serial Standards

RS422, RS485

Software
OS Support

Linux, Mac OSX, Win 10, Win 7, Win 8, Win Vista, Win XP

Environmental
Operating Temperature

0C to 55C

Hardware
Chipset

FTDI

Other Data
Connector

5-Pin Terminal Block, DB9 Male w/ Nuts

Chip Model

FT2232D, MAX3089E

USB Interface

USB 2.0

Warranty

1 year from date of purchase

Weight

1.1 lbs

Dimensions

6.25 × 4.75 × 2 in

UPC: 729440690892
Technical

Technical Specifications:

USB Bus
Compliance USB 1.0/1.1 compliant, USB 2.0 compatible
Speed 12 Mbps, full-speed USB
FIFO 128 byte transmit FIFO
384 receive FIFO
Serial Interface
Port Type RS-422/RS-485
Number of Ports 2
Connectors two DB9 male and two terminal block
Serial Line Protection
ESD Protection 10KV
Serial Port Speed
Baudrate 300 bps to 921.6k bps
Serial Communication Parameters
Data Bits 7, 8
Stop Bits 1, 1.5, 2
Parity None, Even, Odd, Space, Mark
Flow Control RTS/CTS, XON/XOFF
Serial Signals
RS-422 TxD-(A), TxD+(B), RxD+(B), RxD-(A), GND, RTS-(A), RTS+(B), CTS+(B), CTS-(A)
RS-485-4 wire TxD-(A), TxD+(B), RxD+(B), RxD-(A), GND
RS-485-2 wire Data-(A), Data+(B), GND
Driver Support
OS Windows 7, Vista, 2003, XP (WHQL certified) and 2000
Linux Kernel 2.4 and up built-in support
Power Supply
Input Bus-powered
No external power adapter required
Mechanical
Chassis SECC metal chassis with DIN rail bracket
Environmental
Operating Temperature 0 to 55 °C (32 to 131 °F)
Operating Humidity 5 to 95% RH
Storage Temperature -20 to 75 °C (-4 to 167 °F)

 

DB9 Male Connector Pin-outs

DB9 Male Connector Pin-outs Diagram
RS-422 DB9 Male
    RS-422 Signal Pin-outs of DB-9 Male
  Pin Signal  
  1 TxD- (A)  
  2 TxD+(B)  
  3 RxD+(B)  
  4 RxD- (A)  
  5 GND  
  6 RTS- (A)  
  7 RTS+(B)  
  8 CTS+(B)  
  9 CTS- (A)  
 
RS-485 DB9 Male
    RS-485 4-Wire (Full duplex) Signal Pin-outs of DB-9 Male
  Pin Signal  
  1 TxD- (A)  
  2 TxD+(B)  
  3 RxD+(B)  
  4 RxD- (A)  
  5 GND  
 
    RS-485 2-Wire (Half duplex) Signal Pin-outs of DB-9 Male
  Pin Signal  
  1 Data- (A)  
  2 Data+(B)  
  5 GND  
 
RS-422 Terminal Block
    RS-422 Signal Pin-outs of Terminal Block
  Pin Signal  
  1 TxD- (A)  
  2 TxD+(B)  
  3 RxD+(B)  
  4 RxD- (A)  
  5 GND  
 
RS-485 Terminal Block
    RS-485 4-Wire (Full duplex) Signal Pin-outs of Terminal Block
  Pin Signal  
  1 TxD- (A)  
  2 TxD+(B)  
  3 RxD+(B)  
  4 RxD- (A)  
  5 GND  
 
    RS-485 2-Wire (Half duplex) Signal Pin-outs of Terminal Block
  Pin Signal  
  1 Data- (A)  
  2 Data+(B)  
  5 GND  
 

RS-422 Signal Wiring

    Point-to-Point 4 Wire Full Duplex

USB-2COMi-M                                    RS-422 Device
RS-422 Signal Wiring Point-to-Point 4 Wire Full Duplex

    RS-422 with Handshaking

USB-2COMi-M                                   RS-422 Device
RS-422 Signal Wiring RS-422 with Handshaking

RS-485 Signal Wiring

    Point-to-Point 4-Wire Full Duplex

USB-2COMi-M                               RS-485 Device
RS-485 Signal Wiring Point-to-Point 4-Wire Full Duplex

    Multidrop RS-485 2-Wire Half-duplex

USB-2COMi-M                               RS-485 Device
RS-485 Signal Wiring Multidrop RS-485 2-Wire Half-duplex
Optional Accessories

Optional Accessories

The USB to Dual Serial RS-422 / RS-485 Adapter has certain accessories that work with it. These accessories are what you can order if needed.

Support

Product Documentation & Drivers


Need drawings, CAD files, or other compliance documentation? Click HERE

Serial F.A.Q.

Product F.A.Q.

View frequently asked product questions below. For all serial troubleshooting, visit this page.
Still need help? Reach out!

  • How do I clean and reinstall my FTDI drivers?
      1. Download the CDM Uninstaller HERE.
      2. Extract the zip file, or open the “CDMuninstallerGUI.exe” utility.
      3. Leave the ‘Vendor ID’ set to 0403 and ‘Product ID’ set to 6001.
      4. Click Add.
      5. Click Remove Devices.
      6. Download the corresponding driver for your operating system and follow on-screen prompts. Windows Driver | MacOS Driver

    Video tutorial here.

  • How can I change my device’s COM port?
      1. Click on Start and navigate to the Control Panel
      2. Locate and click on Device Manager
      3. Under “Ports (COM & LPT)” you will find your serial device titled “USB Serial Port” along with its current COM Port.
      4. Right click on “USB Serial Port” and click on Properties.
      5. Navigate to the “Port Settings” tab and click on “Advanced…”
      6. Once there, the “COM Port Number:” can be changed with a dropdown menu to select the port number.
      7. Click your desired port number (i.e. COM2) and click “OK”.
      8. Click “OK” once more.
      9. Your serial device is now assigned to your chosen COM Port.

     

  • How do I check to ensure the COM port is listed properly in Windows?
    To ensure your serial device is installed properly, complete the following:

    1. Press Windows Key + R to open the Device Manager. Once Run comes up, type “devmgmt.msc” into the text field and press Enter.
    2. Expand the section labeled, Ports (COM & LPT).
    3. You should now see a COM number in brackets to the right of each port. If the device is installed properly, no exclamation points or question marks should be present next to the device.
  • I have everything hooked up, but nothing is functioning correctly.
    To rule out potential issues, quickly test your individual components to ensure that they are working correctly individually, and are not the source of the problem:

    • Serial cables
    • Serial ports
    • Serial devices

    Test your components by:

    • Hook up the serial cable(s), serial port(s), and serial device(s) in a different setup to see if the issue stems from a particular component, or the setup as a whole.
    • Replace the serial cable, port, or device within your setup to further troubleshoot the issue’s origin.

    When testing cables:

    • Test each cable individually.
    • Use short cables when you are testing.

    When testing serial ports and devices:

    • Press the Windows key + R, in Run, type devmgmt.msc, and press Enter to open the Device Manager. You can then check to see if your device is listed under Ports (COM & LPT).
    • Ensure that the COM port number is the correct number for the serial device and that the software being used to connect the computer to the serial device uses the correct COM port number.
    • If the device is listed with an error, follow the instructions on the website to reinstall the drivers.
  • Serial communication is not functioning correctly, how can I tell if the problem caused by the adapter or my serial software application?
    Older serial communication applications make use of legacy hardware addresses, often incompatible with PCI, PCIe, and USB to Serial products. Contact the software provider to troubleshoot.
  • I am receiving an error when I try to install the drivers in Windows 8 64 bit.
    Driver Signature Enforcement in Windows 8 may need to be disabled in order to use various drivers. After disabling this feature, the driver will be allowed to install.

    Note: You are required to restart your computer after disabling the Driver Signature Enforcement. Save all open work on your computer.

    Disable driver signature enforcement:

    1. Press the Windows key + C.
    2. Click Settings > Change PC Settings.
    3. In the left pane, click General.
    4. In the right pane, under Advanced startup, click Restart now.

    When your system restarts:

    1. Click Troubleshoot > Advanced options > Startup Settings > Restart.
    2. Press 7.

    When your computer restarts, Driver Signature Enforcement will be disabled and you can install the drivers.

  • I am receiving an error when I try to install the drivers in Windows 10 64 bit.
    Driver Signature Enforcement in Windows 10 may need to be disabled in order to use various drivers. After disabling this feature, the driver will be allowed to install.

    Note: You are required to restart your computer after disabling the Driver Signature Enforcement. Save all open work on your computer.

    Disable Driver Signature Enforcement:

    1. Click the Windows icon in the taskbar.
    2. Click Power.
    3. Press and hold the Shift key and click Restart.

    After your computer restarts:

    1. Click Troubleshoot Advanced Options Startup Settings Restart.
    2. Press 7.

    When your computer restarts, Driver Signature Enforcement will be disabled and you can install the drivers.

  • Why did the software not install properly in macOS High Sierra (10.13) or later?
    High Sierra 10.13 and later versions of macOS enforce strict security policy revisions. In order for the device to operate, software packages like those used in this installation must be allowed in macOS Security and Privacy settings once the software is installed.

    Once the driver/software is installed, follow these steps to allow the software:

    1. Open System Preferences.
    2. Open Security & Privacy.
    3. Click the Allow button near the bottom of the General tab.
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