Single Port USB 2.0 to RS-422 / RS-485 DB-9 Serial Adapter w/ Surge Protection & Optical Isolation

USB to DB9 RS485 Serial Isolation

Isolated industrial USB to Serial port on USB connect RS-422 and RS485 devices, used in industrial environment. With RS-485 the data direction is controlled by the port, without further action from the software.

  • Optically Isolated your serial signal connection up to 2000V DC.
  • An ideal solution for notebook or PC serial communication.
  • Provides up to 25KV surge protection from ESD occurrences.
  • Supports Automatic transmit and receive control for 2-wire RS-485 half-duplex mode.

$98.95

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Units Price
1 - 4 $98.95
5 - 11 $95.98
12 - 24 $94.00
25 - 49 $92.02
50+ $89.06

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Model No. USB-COMi-SI

Description

Introduction:

The USB-COMi-SI USB to Serial RS-422/485 port adapter is individually optically isolated with 2000 volt DC optical isolation. The optical isolation protects your PC or notebook from spikes and surges on the RS-422/485 network. This is done by converting the electrical pulse into an optical signal and then changing it back into an electrical pulse. Your computer is well protected, since the surges and spikes cannot cross the optical link.

 

The USB to serial signals on the RS-422/485 port are individually protected by a surge protector to withstand electrostatic discharge and power surges up to 25KV ESD. Surge suppression on all signals prevents damages caused by lightning and high voltage. The USB to serial port having 512 byte FIFO allows high-speed communication, even in heavily loaded systems. Unique features reduce the system load. The serial port also allows unusual speed settings like 500.000bps.

 

Features:

Hardware Specifications:

  • Most cost economical RS-422/485 adapter with optical isolation
  • 2000V DC optical isolation
  • 25KV ESD surge protection
  • RS-422, RS-485 mode settings by jumpers
  • Installed as standard Windows COM port
  • RS-422 data signals: TxD-, TxD+, RxD+, RxD-, GND, RTS-, RTS+, CTS+, CTS-
  • RS-485 4-wire data signals: TxD-, TxD+, RxD+, RxD-
  • RS-485 2-wire data signals: Data-, Data+
  • Automatic transmit and receive control for 2-wire RS-485 half-duplex mode
  • Built-in termination and biasing
  • High speed serial port with the baud rate up to 921.6K bps
  • Non-standard baud rates supported
  • LEDs of TxD and RxD for easy port monitoring and diagnostic
  • Powered by USB port, no external power adapter required
  • Easy plug and play installation and RS-422/485 device connection
  • COM port number assigned can be changed to any COM port number required
  • Works with USB 1.1 & 2.0 host port

OS Support:

  • Windows 7, 8, 8.1, 10, and Windows 11
  • Linux and Mac OS 10.X

Package Contents:

  • USB to Serial RS422/485 converter
  • USB A to B cable
  • Driver disc
Specifications

Product Specifications

Compliance
Country of Origin

Taiwan

Compliance

TAA

Mechanical
Color

Blue/Gray

Ports

1 Serial Port

USB
USB Type

USB 2.0

Isolated/Surge Protected

Yes

Screw Lock Compatible

Yes

Serial Attributes
Serial Standards

RS422, RS422/RS485, RS485

Software
OS Support

Win 11, Linux, Mac OSX, Win 10, Win 7, Win 8

Environmental
Operating Temperature

0C to 55C

Hardware
Chipset

FTDI

Performance
Isolated/Surge Protected

Yes

Other Data
Connector

DB9 Male w/ Nuts

Chip Model

FT231XQ-R, MAX3089E

Warranty

1 year from date of purchase

Weight

.4 lbs

Dimensions

4 × 4 × 2.25 in

UPC: 729440690878
Technical

Technical Specifications:

USB Bus
Compliance USB 1.0/1.1 compliant, USB 2.0 compatible
Speed 12 Mbps, full-speed USB
FIFO 128 byte transmit FIFO
384 receive FIFO
Serial Interface
Port Type RS-422/RS-485
Number of Ports 1
Connectors DB9 male
Serial Line Protection
ESD Protection 25KV
Optical isolation 2000V DC
Serial Port Speed
Baudrate 300 bps to 921.6k bps
Serial Communication Parameters
Data Bits 5, 6, 7, 8
Stop Bits 1, 1.5, 2
Parity None, Even, Odd, Space, Mark
Flow Control RTS/CTS, XON/XOFF
Serial Signals
RS-422 TxD-(A), TxD+(B), RxD+(B), RxD-(A), GND, RTS-(A), RTS+(B), CTS+(B), CTS-(A)
RS-485-2 wire Data-(A), Data+(B), GND
Driver Support
OS Windows 7, Vista, 2003, XP (WHQL certified) and 2000
Linux Kernel 2.4 and up built-in support
Power Supply
Input Bus-powered
No external power adapter required
Mechanical
Chassis Plastic, ABS
Environmental
Operating Temperature 0 to 55 °C (32 to 131 °F)
Operating Humidity 5 to 95% RH
Storage Temperature -20 to 75 °C (-4 to 167 °F)
Safety Approvals EN55022 Class B, EN55024, EN61000-3-2, EN61000-3
IEC 61000-4-2, IEC 61000-4-3, IEC 61000-4-4, IEC 61000-4-5,
IEC 61000-4-6, IEC 61000-4-8, IEC 61000-4-11.
CISPR PUB. 22 and FCC Part 15 Class B.

 

    RS-422 & RS-485 DB9 Male Connector Pin-outs

RS-422 DB9 Male
    RS-422 Signal Pin-outs of DB-9 Male
  Pin Signal  
  1 TxD- (A)  
  2 TxD+(B)  
  3 RxD+(B)  
  4 RxD- (A)  
  5 GND  
  6 RTS- (A)  
  7 RTS+(B)  
  8 CTS+(B)  
  9 CTS- (A)  
 
RS-485 DB9 Male
    RS-485 2-Wire (Half duplex) Signal Pin-outs of DB-9 Male
  Pin Signal  
  1 Data- (A)  
  2 Data+(B)  
  5 GND  
 

RS-422 Signal Wiring

    Point-to-Point 4 Wire Full Duplex

USB-COMi-SI                                    RS-422 Device
Point-to-Point 4 Wire Full Duplex Diagram

    RS-422 with Handshaking

USB-COMi-SI                                   RS-422 Device
RS-422 with Handshaking Diagram

RS-485 Signal Wiring

    Multidrop RS-485 2-Wire Half-duplex

USB-COMi-SI                                     RS-485 Device
Multidrop RS-485 2-Wire Half-Duplex Diagram
Accessories & Replacement Parts

Optional Accessories

The USB to Serial Optical Isolated Converter has certain accessories that work with it. These accessories are what you can order if needed.

USB 2.0 Cable for close connections Use this USB 2.0 cable to connect your desktop or laptop using a USB hub, printer, or scanner. Transfer…

Model# USB2-AB

$2.95$10.95

In stock

Select options

Support

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.
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