USB to RS485 / RS422 Converter FTDI CHIP with Terminals

(9 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, & Windows 10
  • Linux
  • Mac OS 10.X


Product Documents

In stock (can be backordered)

Purchase from Retailer

Model #: USA-482422 Category: Tag:

Didn't Find What You Were Looking For? Support


GM-482422 USB to RS485 / RS422 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 RS485 / RS422 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 RS485 / RS422 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 RS485 / RS422 Converter is plug-and-play without any jumper settings needed for mode shifting between full duplex (RS422) and half duplex (RS485). USB to RS-485 – RS-422 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-485, RS-422 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
  • 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

, , , ,


USB to RS485-RS422

Google Product Category


1 year from date of purchase.



9 reviews for USB to RS485 / RS422 Converter FTDI CHIP with Terminals

  1. 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

  2. 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

  3. 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

  4. 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

  5. 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.

  6. N.Kay

    Price abit high

  7. 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.

  8. 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.

  9. Me

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

Add a review

Your email address will not be published. Required fields are marked *


+1 (727) 209-1300
Mon - Fri: 9 AM - 5 PM EST

Resource Center
Find helpful links, articles, and learning resources.
Quotes & Volume Pricing
Contact our sales team for quotes or quantity pricing.
Returns & Claims
Begin the return process and fill out an RMA form.