USB2 to 8-Port RS232-422-485 Serial TB Adapter

Model No. USB2-8COMi-TB

15KV ESD and 600W Surge Protection for RS-232/422/485 Ports

Our series of Industrial USB 2.0 to terminal block serial adapters supports RS-232, RS-422, and RS485 electrical protection per port and are designed with the user in mind.

  • Supports 15KV ESD protection and 600W surge protection for all 8 serial signals
  • Uses FTDI FT4232H USB 2.0 to quad UART chip
  • Incorporates DIP switch control over each individual port.
  • Per port protection from ESD and Surge Protection.

$299.95

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Model No. USB2-8COMi-TB

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Description

8 RS-232/422/485 ports via terminal block connection

The USB2-8COMi-TB is a USB2 to 8-port industrial serial adapter that protects your device(s) with 15KV ESD protection and 600W surge protection over each port. It is designed to make RS-422 and RS-485 serial port expansion quick and simple through its terminal block connections. Port signals are controlled by DIP switches as is the control over termination and biasing.

Each serial port terminal block can be individually designated for the signal your application demands. The USB 2 to 8-port serial adapter has an industrial designed metal case where the DIP switches are located within the bottom metal access panel.

By connecting to the USB port on your computer or available USB hub, the USB2 to 8-port industrial serial adapter instantly adds eight RS-232/422/485 serial communication ports to your system while taking advantage of both the Plug-and-Play, and Hot-Plug features of the USB bus.

The USB2-8COMi-TB industrial serial adapter makes it very easy to add 8 industrial communication ports to your system though its terminal block interface with DIP switch controls.

Product Features

  • Adds eight high-speed RS-232/422/485 serial ports via USB connection.
  • 2K byte receive buffer.
  • 2K byte transmit buffer for high speed data throughput.
  • Requires no IRQ, DMA, I/O port.
  • Data rates: 300 bps to 921.6K bps.
  • Each serial port supports 5-pin screw-lock-type terminal block connector.
  • Auto-transmit buffer control for 2-wire RS-485 half-duplex operation.
  • Biasing and Termination resistors installed on-board.
  • Supports RS-232 3-wire signals: RxD, TxD, GND
  • Supports RS-422, RS-485 4-wire signals: TxD-, TxD+, RxD+, RxD-
  • Supports RS-485 2-wire signals: data-, data+
  • Monitor LEDS of TxD, RxD indicating port status
  • 15KV ESD protection and 600W surge protection for all serial signals
  • Virtual COM port drivers available for Windows 11, 10, 8, 7
  • Industrial grade metal case with DIN-rail ears for Din-rail mounting.
  • Chipset: Genesys GT852G 4-port USB 2.0 hub chip + FTDI FT4232H USB 2.0 to quad UART chip
  • Dimensions: 192.42 x 122.22 x 23.60 mm (L×W×H), dimensions are to DIN rail(W), to power plug(L)

Package Contents

  • USB2-8COMi-TB serial adapter
  • 2 pin Phoenix connector
  • Power adapter
  • USB cable

*Surface Mounting screws not included.

Specifications

Product Specifications

Power
Input Voltage

+9~28V DC

Compliance
Certifications

,

Physical Characteristics
Color

Black

Mounting Style

Din-Rail

Ports

8 Serial Ports, 1 USB Port

Screw Lock Compatible

Yes

Serial Attributes
Serial Standards

RS232, RS422, RS485

Software
OS Support

Win 10, Win 7, Win 8, Win 8.1, Win Vista

Environmental
Operating Temperature

0 to 60C

Hardware
Chipset

FTDI

Performance & Safety
Isolated/Surge Protected

Yes

Other Data
Connector

5-Pin Terminal Block

USB Interface

USB 2.0

Weight

2.12 lbs

Dimensions

11.250 × 5.687 × 2.500 in

UPC: 736983902450
Technical
Serial Ports 8 RS-232, RS-422, RS-485 Ports
RS-232 Signals TxD, RxD, GND
RS-422 Signals TxD-, TxD+, RxD+, RxD-
RS-485 Signals TxD-, TxD+, RxD+, RxD-, GND (4 wire)
Data-, Data+, GND (2 wire)
   
Connectors Eight 5-pin screw-lock-type terminal block connectors
   
Protection 15KV ESD protection and 600W surge protection for all serial signals
   
Chipset Genesys GT852G 4-port USB 2.0 hub chip + FTDI FT4232H USB 2.0 to quad UART chip
   
Environmental Operating Temperature: 0°C to 60°C
  Storage Temperature: -40°C to 85°C
  Humidity: 0 to 80% RH. Non-condensing
  Safety Approvals: CE, FCC
   
RS-232 Pin-out for 5-pin Screw-Lock-Type Terminal Block connector
  Pin Name Pin Type Desciption
  TxD- (Data-) X No Function
  TxD+(Data+) X No Function
  RxD+ (TxD) Output TxD : Transmit RS-232 Data
  RxD- (RxD) Input RxD : Receive RS-232 Data
  GND Ground GND : Signal Ground
   
RS-422 Pin-out for 5-Pin Screw-Lock-Type Terminal Block Connector
  Pin Name Pin Type Description
  TxD- (Data-) Output TxD- : Transmit RS-422 Data, negative polarity
  TxD+(Data+) Output TxD+ : Transmit RS-422 Data, positive polarity
  RxD+ (TxD) Input RxD+ : Receive RS-485 Data, positive polarity
  RxD- (RxD) Input RxD- : Receive RS-485 Data, negative polarity
  GND Ground GND : Signal Ground
   
RS-485 Full Duplex (4 Wire) Pin-out for 5-Pin Screw-Lock-Type Terminal Block Connector
  Pin Name Pin Type Description
  TxD- (Data-) Output TxD- : Transmit RS-485 Data, negative polarity
  TxD+(Data+) Output TxD+ : Transmit RS-485 Data, positive polarity
  RxD+ (TxD) Input RxD+ : Receive RS-485 Data, positive polarity
  RxD- (RxD) Input RxD- : Receive RS-485 Data, negative polarity
  GND Ground GND : Signal Ground
   
RS-485 Half Duplex (2 Wire) Pin-out for 5-Pin Screw-Lock-Type Terminal Block Connector
  Pin Name Pin Type Description
  TxD- (Data-) Output/Input Data- : Transmit/Receive RS-485 Data, negative polarity
  TxD+(Data+) Output/Input Data+ : Transmit/Receive RS-485 Data, positive polarity;
  RxD+ (TxD) X No Function
  RxD- (RxD) X No Function
  GND Ground  
   
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Optional Accessories

Optional; Accessories

The 8-Port RS232-422-485 Serial TB Adapter has certain accessories that work with it. These accessories are what you can order if needed.

Out of stock
USB 2.0 Cable - Screw Lock Cable Our Screw Lock USB cables are designed and manufactured to be the best your money can get and…

Model# SC-U3MAB

$13.95

EOL - Discontinued

Replacement Parts

Replacement Parts

Did you misplace or break a part that came with your 8-Port RS232-422-485 Serial TB Adapter? Purchase it here!

Replacement 2-Pin Power Connector for CoolGear USB 3.0 Hubs such as USBG-7U3ML.

Model# CG-2PPW

$2.95

In stock

USB 2.0 Cable - Screw Lock Cable Our Screw Lock USB cables are designed and manufactured to be the best your money can get and…

Model# SC-U2MAB

$8.95

Not in stock - Backorder allowed

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.