ATC-820 USB to RS485 Converter


4.9 stars 4.9 (7) See customer reviews


MPN: ATC-820

Manufacturer: ATC

Stock Status: In stock

Delivery: Ships same or next business day
Free shipping to the US on orders over $100

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Product Information

Product Description

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The ATC-820 is a high speed USB to RS485 (2-wire, Half-duplex) adapter. The ATC-820 uses a DB9 male connector and supports baud rates from 300 to 1M baud. The USB interface is 1.1 and 2.0 compatible and uses the FTDI high speed serial to USB chip.


This product is frequently used to configure the ATC-871-S2, a RS485 wireless short distance radio.

Documents and Drivers


ATC-820 User’s Manual

ATC-820 CE Certificate


ATC-820 Windows Drivers


Cable Length

100 cm


Uses the FTDI serial to USB chip

Data Rate

Transfer rate up to 1 Mbaud


60 x 57 x 24 mm (not including cable)

Indicators LED

TX & RX data


  • RS485 half duplex, auto flow control
  • USB 1.1 and 2.0 compliant



Power Consumption

<100 mA


RS485 bus protection 600W

Serial Interfaces

RS-485 Half Duplex

Supported OS

  • Windows 7 to Windows 11
  • Windows Server

Temperature Range

-0°C to +70°C (32°F to +158°F)


10% to 90% (non-condensing)

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