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Open Source Isolated RS-422 / RS-485 Shield

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  • Open Source Isolated RS-422 / RS-485 Shield

    Over the weekend I finished my open-source isolated RS-422 / RS-485 shield for the P1AM-100. The shield fits inside the P1AM-PROTO prototyping enclosure. It's based on the Analog Devices ADM2582E isolated, full-duplex RS-422 / RS-485 transceiver. Optional 120 Ω termination is independently selectable on both the transmit and receive pairs.

    Click image for larger version

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    The board is compatible with the P1AM-100 with P1000 bus modules and the P1AM-ETH Ethernet module installed. The board has a Microchip EUI-48 serial EEPROM with a MAC address on it for use with the P1AM-ETH Ethernet module as a bonus feature.

    The project is documented on my blog:

    The hardware design files and example sketches are available in one of my GitHub repositories:

    I'm open to forks, pull requests, and constructive feedback. Hopefully people will find this useful.