Mounting Options:
DIN-Rail Series
Workstation Series
Desktop Series
Rack Mount Series
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The USB2-8COMi-SI-TB is a USB 2 to 8-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. 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.
$434.99
Expected Availability Date: October 10, 2025
Not in stock - Backorder allowed
The USB2-8COMi-SI-TB is a USB 2 to 8-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 (8 4-pin DIP switches), each terminal block serial port can be individually designated for the signal your application demands. The USB 2 to 8-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 eight 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 USB2-8COMi-SI-TB industrial serial adapter makes it very easy to add 8 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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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) |
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Connectors | Eight 5-pin screw-lock-type terminal block connectors | ||
Protection | 15KV ESD protection, 600W surge protection, and 3000 Volt DC optical isolation 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 | ||
The USB 2.0 to 8-Port RS232-422-485 Serial Adapter has certain accessories that work with it. These accessories are what you can order if needed.
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:
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