8-Port Terminal Block RS232/422/485 to USB Adp – ISO/Surge Protection

RS232 to USB Adapter with Terminal Block

SA-8PX-IS Rugged 8-Port Terminal Block RS-232, RS-422, RS-485 USB 2.0 to Serial Converter is an ideal expansion adapter with an industrial grade metal chassis and supporting upstream USB type “B” screw lock mechanism to prevent accidental disconnect.

  • Terminal Block connections for RS232/RS422/RS485 serial signal.
  • Operates from host USB port of computer.
  • 128-byte deep FIFO per transmitter and receivers.
  • Supports USB type-B up-stream connection from the serial adapter.


In stock

Volume Pricing

Units Discount Price
1 - 4 $399.95
5 - 11 3 % $387.95
12 - 24 5 % $379.95
25 - 49 7 % $371.95
50+ 10 % $359.96

Also available from:

Model No. SA-8PX-IS


SA-8PX-IS Industrial Rugged 8-Port Terminal Block RS-232 USB 2.0 to Serial Converter is an Industrial Grade USB serial adapter designed to quickly add 8 high-speed RS-232 serial ports to desktop or notebook computers. The SA-8PX-IS is compatible with new and legacy RS232/422/485 devices enabling your network to grow without sacrifice.

This industrial grade USB to serial adapter supports serial port data transfer rates of up to 921.6 Kb/s, Full Speed (12Mbits/Second) and USB 2.0 High Speed (480Mbits/Second) and is backward compatible USB versions 1.0/1.1, providing scalability to new USB technologies. It also allows for multiple modules that can be added to a single USB interface for RS232/422/485 connectivity as needed.

The SA-8PX-IS 8-Port supports applications needing combinations of RS232, RS422 and RS485 in one single USB port. It supports screw lock features for the upstream (USB type B) port connector from the Host to prevent accidental disconnection. The adapter uses Plug-and-Play features and drivers, simply follow the instructions of Install Wizard until the install is complete.

The terminal blocks enable you easily install your wires for different devices and their direct connections. The SA-8PX-IS is an ideal solution for your expanding applications and making a big success in your projects.

Industrial 8-Port Terminal Block Adapter Features

  • Supports 8 RS232/422/485 Combo Serial Ports
  • RS232 Supports 3-wire Signals (TXD, RXD, GND)
  • Supports 4-wire RS422/485 and 2-wire RS485 Modes
  • Supports RS485 Auto Transceiver Turn Around by unique featured ATTATM Hardware
  • 128-byte deep FIFO per transmitter and receivers
  • Each Serial Port Supports 7-pin Lock-type Terminal Blocks
  • Supports isolation and surge protection
  • Supports Screw Lock Mechanism for USB type “B” upstream connector
  • Supports one Downstream USB 2.0 Port for Daisy-chain Expansion Modules
  • Supports Baud Rate up to 921.6Kpbs


USB 2.0 Port

  • USB 2.0 High Speed (480Mbits/Second) and Full Speed (12Mbits/Second) compatible, backward compatible with USB 1.0 and USB 1.1, the USB 2.0 type “B” connector equips a Screw Lock Mechanism.

Serial Ports – Provides 8 7-pin terminal block connector RS232/422/485 ports, the key benefits are:

  • Connectors: 8 7-pin lock type Terminal Block Connectors
  • LEDs: Supports LED Indicators for TXD and RXD Signal Activity
  • Interface: 4 modes: 3-wire RS232, 4-wire RS422 (TXD+/-, RxD+/-). 4-wire RS485 (TxD+/-, RxD+/-). 2-wire RS485 (Data+/-)
  • Parity: None, Even, Odd
  • Data bits: 5,67,8,9 bits Data Frames
  • Speed: up to 921.6Kbps
  • Terminator: 120 OHM, can be Enabled/Disabled by DIP Switches
  • ATTATM: Auto RS485 Transmitter buffer direction control by the ATTATM Hardware. Guarantee Fast Turn Around the Transceiver.
  • Power: The Module Box should be powered by its 2-pin Terminal Block Connector

I/O Hardware:

  • 8 7-pin Terminal Block Connectors
  • 1 Up Stream and 1 Down Stream USB2.0 Ports
  • 1 2-pin Terminal Block Power Input Connector

OS Support:

  • Windows 10, 8, 7, Vista, 2008, 2003, XP, Win2000
  • Linux

Environmental Specifications:

  • Operating Temperature: 0 to 55°C (32 to 131?F), 10% to 90% relative humidity (non-condensing)
  • Storage Temperature: -40 to 75°C (-40 to 167?F), 5% to 95% relative humidity (non-condensing)

Form Factor (without ears and connectors):

  • 9.68” (L)x 3.37”(W)x0.91”(H) (24.60cm x 8.57×2.32cm)

Package Contents

  • 8 port RS232/422/485 to USB adapter
  • USB A to B cable
  • Driver Disc
  • Paper installation guide

*Surface Mounting screws not included.


Product Specifications

Operating Temperature

0C to 55C

OS Support

Win-2000, Linux, Win 10, Win 7, Win 8, Win Vista, Win XP

Serial Attributes
Serial Standards

RS232, RS422, RS485

USB Type

USB 2.0



Mounting Style

Surface Mount


8 Serial Ports

Country of Origin






Other Data

Terminal Block


1 year from date of purchase.


2 lbs


9.37 × 9.68 × 0.91 in

UPC: 736983902825
Optional Accessories

Optional Accessories

The 8 port RS232/422/485 to USB adapter has certain accessories that work with it. These accessories are what you can order if needed.


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.
Reviews (0)


There are no reviews yet.

Be the first to review “8-Port Terminal Block RS232/422/485 to USB Adp – ISO/Surge Protection”