Mounting Options:
DIN-Rail Series
Workstation Series
Desktop Series
Rack Mount Series
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$269.29
Expected Availability Date: October 10, 2025
Not in stock - Backorder allowed
The USB2-4COMi-SI-TB is a USB 2 to 4-port industrial serial adapter that protects you device(s) with optical Isolation, 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 connection. All ports are controlled by DIP switches, each terminal block serial port can be individually designated for the signal your application demands. The USB 2 to 4-port serial adapter has an industrially designed metal case where the DIP switches are located within the bottom access panel.
By connecting to the USB port on your computer or available USB hub, the USB to industrial serial adapter instantly adds four RS-232/422/485 interface serial communication ports to your system while taking advantage of both the Plug-and-Play, and Hot-Plug features of the USB bus.
The USB2-4COMi-SI-TB industrial serial adapter makes it very easy to add 4 protected industrial communication ports to your system though its terminal block interface with DIP switch controls.
*Surface Mounting screws not included.
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The USB 2 to 4-Port RS232-422-485 Serial TB Adapter has certain accessories that work with it. These accessories are what you can order if needed.
Model# SC-U2MAB
$9.99In stock
Model# 9DBMF5FT
$2.99In stock
Model# SC-U3MAB
$13.95Out of stock
View frequently asked product questions below. For all serial troubleshooting, visit this page.
Still need help? Reach out!
Test your components by:
When testing cables:
When testing serial ports and devices:
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:
When your system restarts:
When your computer restarts, Driver Signature Enforcement will be disabled and you can install the drivers.
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:
After your computer restarts:
When your computer restarts, Driver Signature Enforcement will be disabled and you can install the drivers.
Once the driver/software is installed, follow these steps to allow the software:
Model# USB-16COMi-RM
$758.99Not in stock - Backorder allowed
Model# CM-41042
$287.29Out of stock
Model# USB2-4COMi-TB
$204.29Not in stock - Backorder allowed
Model# USBG-BAY4
In stock
Model# USB-4COM
$116.29In stock
Model# USBG-232FT-1
Not in stock - Backorder allowed
Model# CG-232485CBO
$106.99In stock
Model# USBG-RS232-F72
In stock
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