The AK-RS485/422-HD board converts serial UART streams into RS485/422 communication protocol. It is a breakout board for the XR33038 RS485/422 transceiver IC from EXAR.

This board provides standard half-duplex RS485/422 conversion with a maximum data rate of 10Mbps. It has a wide power supply range (from 2.8V up to 5.5V) and a 18V tolerance (withstands direct short circuit) on the bus pins.

The board has 0.1″ (2.54mm) spaced pins for the UART and power supply, and a screw terminal where you will connect the RS485/422 signals. We also have a version of the same board without the screw terminal.

There is an on-board 120 Ohm termination resistor that you can enable by joining a solder jumper and two LEDs that indicate whenever the transmitter and/or receiver are enabled.

If you are looking for a Full-Duplex RS485/422 transceiver, we have that too.

The board comes fully tested and populated.


  • RS485/422v transceiver.
  • 2.8V up to 5.5V power supply.
  • 10Mbps Half-duplex.
  • Fault Protected RS485/422 bus pins up to ±18V.
  • 300μA idle current, 40nA shutdown current.
  • Enhanced receiver fail-safe protection for open, shorted, or terminated but idle data lines
  • Hot-swap glitch protection on DE and RE pins
  • Driver short circuit current limit and thermal shutdown for overload protection
  • 1/8th unit load allows up to 256 devices on bus
  • On-board 120 Ohm terminator resistor.
  • On-board indicator LEDs.
  • On-board screw terminals.
  • Mounting holes.
  • Small size.



Additional information

Weight 0.009 kg
Dimensions 27 × 16 × 12 mm



Share this Product

AK-RS485/422-HD – RS485/422 Breakout with Screw Terminals

Serial UART to RS485/422 transceiver board with screw terminals. Breakout board for the EXAR XR33038 transceiver IC.


In stock

Accepting all credit cards and wire transfers
Secure payments with Stripe and PayPal

Need help? Drop a line in our support forum.