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USB-8COMi-M USB to Serial Adapter - 8 Ports 

 

USB-8COMi-M 8-Port USB to RS-422 / 485 Optical Isolation Serial Adapter Manual 

 

The USB-8COMi-M USB to industrial Octal RS-422/485 Adapter is 
designed to make serial port expansion quick and simple. Connecting 
to a USB port on your computer or USB hub, the USB Serial Adapter 
instantly adds 8 RS-422/485 multi-electrical interface serial 
communication ports to your system. By taking advantage of the USB 
bus, the USB-8COMi-M Adapter makes it easier than ever to add 8 
RS-422/485 ports and serial devices to your system with easy plug-
and-play and hot plug features. Adapting the new technology, the 
serial port expansion now takes the new bus with easy and 
convenient connectivity. 

Plugging the USB 8-Port RS-422/485 Adapter to the USB port, the 
adapter is automatically detected and installed. There are no IRQ & COM port conflicts, since the port doesn't require 
any additional IRQ, DMA, memory as resources on the system. The RS-422/485 port functions as native Windows COM 
port, and it is compatible with Windows serial communication applications. Each port is individually configurable. The 
adapter is designed with external DIP switches to set the RS-422 or RS-485 ports and different operation modes 
conveniently. There is no need to open the chassis to set the ports. 

The USB Serial Adapter provides instant connectivity to RS-422 or RS-485 communication devices for factory automation 
equipment, multi-drop data collection devices, barcode readers, time clocks, scales, data entry terminals, ATMs and 
serial communication in harsh environment. The USB to Serial Adapter is suitable for remote access, retail and industrial 
application, data collection and other applications requiring high speed RS-422/485, communication ports. 

Specifications and Features 

 

 

Adds eight high speed RS-422 / 485 serial ports via USB connection. 

 

384 byte receive buffer. 

 

128 byte transmit buffer for high speed data throughput. 

 

Requires no IRQ, DMA, I/O port. 

 

Data rates: 300 bps to 921.6K bps. 

 

Serial Connector: one DB-9 male connector. 

 

Auto transmitting of buffer control for 2-wire RS-485 half-duplex operation. 

 

Termination resistors installed on-board. 

 

RS-422 data signals: Tx-, Tx+, Rx+, Rx-, GND, RTS-, RTS+, CTS+, CTS-. 

 

RS-485 data signals: Tx-, Tx+, Rx+, Rx-(4 wire) and data-, data+ (2 wire). 

 

Monitor LEDs of TxD, RxD indicating port status. 

 

Power Supply: provides an external DC12V power adapter 

 

Virtual COM port drivers available for Windows 7, Vista, 2003, XP, 2000. 

 

Summary of Contents for USB-8COMi-M Series

Page 1: ...vidually configurable The adapter is designed with external DIP switches to set the RS 422 or RS 485 ports and different operation modes conveniently There is no need to open the chassis to set the po...

Page 2: ...OFF ON Half Duplex 2 wire Without Echo OFF OFF OFF JP3 Port 1 JP4 Port 2 JP5 Port 3 JP6 Port 4 JP7 Port 5 JP8 Port 6 JP9 Port 7 JP10 Port 8 for Termination and Biasing Option Configuration Inside the...

Page 3: ...ows as Administrator or ask your system administrator to install the USB COM driver You need to install driver first prior to hardware installation Do not connect the USB to Serial Adapter to the USB...

Page 4: ...ect Port Setting and Advanced Click the drop down arrow on COM Port Number and scroll to the required COM port Select OK Return to the Device Manager Screen You will see that the USB Serial Port insta...

Page 5: ...ick Yes to confirm it 7 Click No to proceed 8 When the message Status System clean completed appears double click Exit to complete the USB to serial drivers uninstall 9 Press Start button and select C...

Page 6: ...e second Windows Driver Package 15 Reboot the computer to complete the driver uninstall Uninstalling Windows 7 or Vista Drivers Windows 7 and Vista have many new security features You need to proceed...

Page 7: ...click the box for Delete the driver software for this device in the next window and press OK Note if you have more than one USB Serial Port COMx installed in your PC you need to repeat from step 5 to...

Page 8: ...be sure to click the box for Delete the driver software for this device in the next window and press OK Note if you have more than one USB Serial Converter installed in your PC you need to repeat step...

Page 9: ...ear com RS 422 Signal Pin outs of DB 9 Male Pin 1 TxD A Pin 2 TxD B Pin 3 RxD B Pin 4 RxD A Pin 5 GND Pin 6 RTS A Pin 7 RTS B Pin 8 CTS B Pin 9 CTS A RS 422 Signal Wiring Point to Point 4 Wire Full Du...

Page 10: ...gnal Pin outs of DB 9 Male Pin 1 Tx A Pin 2 Tx B Pin 3 Rx B Pin 4 Rx A Pin 5 GND RS 485 2 Wire Half duplex Signal Pin outs of DB 9 Male Pin 1 Data A Pin 2 Data B Pin 5 GND RS 485 Signal Wiring Point t...

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