USB to RS-422/485 Converter FTDI CHIP w/ Terminals

(14 customer reviews)


USB to RS-485 / RS-422 Converter contains an FTDI Chip with terminals photoelectric interface can convert the single ended USB  signal into difference RS-422 or RS-485 signal. The converter includes Transient Voltage Suppressor technology!

OS Support:

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


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Model #: USA-482422 Category: Tag:

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GM-482422 USB to RS-422 / RS-485 Converter FTDI Chip with Terminals photoelectric isolation interface converter can convert the single ended USB signal into difference RS422 or RS485 signal. The built-in photoelectric isolator of the USB to RS-422 / RS-485 Converter can provide an isolation voltage as high as 2500Vrms. There is also a rapid transient voltage suppression protector for protection of RS422 / RS485 interface with advanced TVS (Transient Voltage Suppressor) technology.

Under normal conditions the TVS tube is in a state oh high resistance. However, when both ends of the TVS tube are hit by transient high energy, the impedance at the both ends can be depressed by the TVS at very high speed. After absorbing a high current, the voltage between the two ends is depressed and kept at a pre-set value; therefore no damage is caused to the electrical components behind the transient high voltage impact.

Package Contents:

  • USB to RS-422 / RS-485 Converter FTDI CHIP with Terminals
  • Latest FTDI Driver (also available for download)
  • GM-482422 Product Manual (also available for download)

USB to RS-485 / RS-422 circuit board imageThe protector can effectively restrain lighting or ESD (Electro-Static Discharge) with a protection voltage of 600w on each line for lightning surge and transient voltage events, while transmission of RS-422 / RS-485 is maintained by capacitors between the poles. The unique I/O circuit of the internal zero delay auto transceiver contained in the converter controls the data stream direction automatically without any handshaking signals (Such as RTS, DTR, etc).

The GM-482422 USB to RS-422 / RS-485 Converter is plug-and-play without any jumper settings needed for mode shifting between full duplex (RS-422) and half duplex (RS-485). USB to RS-422 – RS-485 Converter is applicable for all existing communication software and interface hardware. The converter uses an FTDI Chip for its operations and has a terminal based connection.

RS-422, RS-485 data output, connector, and bay-line distribution.

Connector and Signal      
Connection Pole Data Output RS-422 Full Duplex RS-485 Half-Duplex
1 T/R+ Send (A+) RS-485 (A+)
2 T/R- Send (B-) RS-485 (B-)
3 RXD+ Receive (A+) N/C
4 RXD- Receive (B-) N/C
5 GND Ground Wire Ground Wire

For point-to-multipoint communication, as many as 32 devices of RS-422 or RS-485 can be connected to each converter, and a high data rate of 300bps to 321.6Kbps can be achieved. Power indicator light and dual data traffic indicator lights are also available with USB to RS485 / RS422 Converter for malfunction detection.

Standards Supported:

  • USB v. 1.0, 1.1, 2.0
  • TIA/EIA RS-422, RS485

Additional Features:

  • RS-485 Signals: T/R+, T/R-, GND
  • RS-422 Signals: TX+, TX-, RX+, RX-, GND
  • Supports Windows 7, 8, 10, and 11, Linux, OSX
  • Modes: Asynchronous, Point-to-Point, Point-to-Multipoint, 2-Wire (Half-Duplex), 4-Wire (Full-Duplex)
  • Transmission Rates: 300 to 921,600bps, automatic detection of signaling rate
  • Load Capability: 32 devices in Point-to-Multipoint topology.
  • Transmission Distance: RS485/422: 1.2km (all rates), USB: 5 Meters
  • Interface Protection: 600W Lightning Strike and surge suppression, +- 15KV ESD protection
  • Signaling Diagnostics: LEDs for POWER, TX and RX
  • Dimensions: 62x33x19 mm
  • Working environment: -40C to 85C, RH 5%-95%
  • Chipset: FTDI FT232RL

Additional information

Weight .15 lbs
Dimensions 3 × 3 × .5 in






Supported OS

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USB to RS485-RS422

Google Product Category


1 year from date of purchase.



14 reviews for USB to RS-422/485 Converter FTDI CHIP w/ Terminals

  1. George

    5.0 out of 5 stars

    Works great
    My PC configured it automatically and it has been working with no issues!

  2. Tiffany Bird

    5.0 out of 5 stars

    Worked with M1 Mac
    I was nervous because the driver listed only intel Macs. It worked for me with my M1 MacBook Pro running MacOS Ventura, version13.1, using cool term. The device showed up in cool term without installing any drivers. I initially had my baud set incorrectly. So, I thought it wasn’t working and installed the driver. Now two devices show up in cool term. Both seem to work correctly.

  3. Kira

    This does exactly what its supposed to and has held up to some extreme conditions (-36F to 111F) without fail.

  4. Kindle Customer

    Nice usb device for bacnet access.
    This device plus YABE are good for looking at bacnet devices. Finding out what points are available and writting to some for settings.

  5. T. Webb

    Works perfect for Watlow EZ-Zone Controllers/Configurator
    Bought this specifically to use for configuring a Watlow PM8 control using the Watlow EZ Configuration software (via RS-485) on a Windows 10 PC. Installed this adapter into USB port, let Windows search and install a driver and it was ready to roll. It came with a mini-cd containing a bunch of driver files and pdf manuals as well. Didn’t need the driver files, but the manual was nice, as it illustrates the adapter pin-out. Overall, a great purchase.

  6. Me

    Good RS485 adapter for pc.
    Very simple except no wiring diagram. Just Google it – no problem. Works great.

  7. W. Dagg

    Works for WATLOW PM6 Controllers
    For the 1 person alive who is also using WATLOW’s EZ-Zone Configurator, this works as well as – or better than – the one sold by WATLOW and is only about 14% the cost. We’ll see how it holds up over time. Plugging it in and letting Windows (don’t know about Mac & Linux) download the driver, or going to Device Manager and getting the driver off the web should get you running. Just remember to set the latency for the COM port if there are issues. You will still need to send power to the WATLOW device while trying to configure it.

  8. Juke Worx

    Great for BACNET MSTP work.
    I use this to find BACNET MSTP devices using BQT software. Helps to verify the instance numbers and change the Object Name too. Has big screws to connect transmit and receive, along with a light that shows the its transmitting and receiving.

  9. N.Kay

    Price abit high

  10. Michael

    I am new to RS485 and I needed this to communicate to an OMEGA CN743 temperature controller. It worked right off the bat perfectly. Standard windows 7 laptop.

  11. A. Sesma “psesma”

    Ordered and arrived right on time. Worked perfect from the very beginning. I got the job done in no time. Great product!

    *Reviewed at

  12. Jeffery S

    Not much I can say, but i definitely works and it has simple instructions.

    The pinout diagram is also available on the amazon image.

    *Reviewed at

  13. CentralPA

    This adapter is a life saver when trying to troubleshoot interfacing issues between equipment and building automation systems. I spent several days working on problem and still didn’t get it resolved prior to receiving the USB to RS485 converter. 20 minutes after connecting this, we were after to interface the equipment and were up and running. You need to download proper software to get it to work though.

    *Reviewed at

  14. T. Bonilla Hdez

    The equipment does as advertised. There is a little confusion regarding the pin-out which is not shown in the items sent. But a quick email to the manufacturer solved the doubts I had. The response was made promptly, it was accurate, and very professional. As soon as it was connected the computer was able to communicate with the PLCs.

    *Reviewed at

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