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RS485 Modbus FeatherWing
RS485 Modbus FeatherWing
RS485 Modbus FeatherWing
RS485 Modbus FeatherWing
RS485 Modbus FeatherWing
RS485 Modbus FeatherWing
RS485 Modbus FeatherWing
RS485 Modbus FeatherWing

RS485 Modbus FeatherWing

FeatherWing add-on that converts a UART serial stream to RS-485, supporting up to 32 transceivers on the bus and RJ-45, screw-terminal, or header connections.

$9.90

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  • Works with all Adafruit Feather boards, except boards whose USB-Serial converter uses the UART pins — currently that excludes the ESP8266 Huzzah Feather and the nRF52832 Feather.
  • Third-party Feather-compatible boards (same standardized Feather pinout)

In the box

One assembled and tested RS485 Modbus FeatherWing board.
Header pins (not pre-soldered — you solder them in yourself, a quick task).

Not included

A soldering iron is not included — the header pins ship in the box, but you solder them in yourself.

You also need

A compatible Adafruit Feather board (all Feathers work except boards whose USB-Serial converter uses the UART pins, currently the ESP8266 Huzzah Feather and the nRF52832 Feather).
  • Designed and built in Aguascalientes, Mexico
  • Hardware CERN-OHL v1.2 · firmware GPL-3.0

What is the RS485 Modbus FeatherWing?

The RS485 Modbus FeatherWing is a FeatherWing add-on board built around the SP3485 RS-485 transceiver IC, which converts a UART serial stream to RS-485. The SP3485 is a half-duplex transceiver, reaching transmission speeds up to 10 Mbps, and the board exposes RS-485 on an RJ-45 connector, a 3.5mm screw terminal, and a 0.1″ pitch header. It runs from a single +3.3V supply, is interoperable with +5.0V logic, and supports up to 32 transceivers on the same bus. It works with virtually all Adafruit Feather boards, except boards whose USB-Serial converter uses the UART pins (currently the ESP8266 Huzzah Feather and the nRF52832 Feather).

Read industrial Modbus RTU sensors and meters from a Feather

Situation: your Feather-based project needs data from industrial Modbus RTU field devices, such as temperature sensors or energy/power meters, that only expose an RS-485 serial interface. What you do: stack the RS485 Modbus FeatherWing on the Feather and poll the devices as Modbus RTU slaves through the board’s UART-to-RS-485 conversion, connected via RJ-45, screw terminal, or header. Result: the Feather gets a hardware bridge to read and log values from RS-485 industrial sensors and meters it otherwise has no way to talk to.

Wire a long-distance serial link between two Feathers

Situation: you need a wired serial link between two Feathers placed farther apart than a direct UART or I2C connection can reach. What you do: put an RS485 Modbus FeatherWing on each Feather and wire them together over a twisted-pair RS-485 cable (RJ-45, screw terminal, or header), communicating over the half-duplex link. Result: a point-to-point wired connection that can run up to the RS-485 standard’s maximum permissible length of about 1200 meters (4000 ft) between driver and receiver, well beyond what UART or I2C support directly.

Add a listening node to an existing RS-485/Modbus network

Situation: an existing RS-485/Modbus network already has a master and field devices, such as sensors, meters, VFDs, and controllers, and you want to add a node that logs or monitors that traffic. What you do: stack the RS485 Modbus FeatherWing on a Feather and wire it onto the same RS-485 bus, which allows up to 32 devices without a repeater, so it receives the same UART-converted traffic as the other nodes. Result: the Feather becomes an extra node on an existing RS-485/Modbus installation, able to log the bus traffic without disrupting the existing master/slave devices.

Start in 10 minutes

Weight0.015 g
Dimensions18 × 12.5 × 2 cm
Transceiver IC

SP3485 RS-485 transceiver

Interface

RS-485 half-duplex, up to 10 Mbps

Connectors

RJ-45, 3.5mm screw terminal, 0.1" pitch header

Power

Single +3.3V supply, interoperable with +5.0V logic

Driver/Receiver Enable

Connected to RTS line

Common-mode input voltage range

-7 V to +12 V

Bus capacity

Up to 32 transceivers on the bus

Protection

Driver output short-circuit protection

Which Feather boards does the RS485 Modbus FeatherWing work with?
All Adafruit Feather boards, except boards whose USB-Serial converter uses the UART pins — currently that excludes the ESP8266 Huzzah Feather and the nRF52832 Feather.
One assembled and tested RS485 Modbus FeatherWing board, plus header pins that you solder in yourself (a quick task).
Yes. The hardware is released under the CERN Open Hardware Licence v1.2, and the firmware/examples under GNU AGPL v3.0.
Free shipping to the US on orders $200+ USD · to Mexico on orders $75+ USD