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 5mm spaced pins where you will connect the RS485/422 signals. We also have a version of the same board with practical screw terminals.

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 0.010 kg
Dimensions 27 × 16 × 3 mm



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AK-RS485/422-HD – RS485/422 Breakout

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


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