Shield used to connect an Arduino-style microcontroller board to full duplex RS-422 serial (RX and TX pairs) transceivers that are also a crossover to a Pi Zero connector. A half duplex management line (DTR pair) is also available for use through the RJ45 CAT5 cable connectors.
To connect a Linux SBC to a RPUno with a multidrop serial line.
This shield takes power on the VIN pin and uses a SMPS to convert that power for the Pi Zero. The RS-422 bus is powered by the +5V pin. The interfaces between the Pi Zero and other devices use 74LVC07A buffers with IOFF to allow the Pi Zero to power down without disrupting the RS-422 bus (e.g. the control board can continue to use the RS-422 as long as it provides power on the +5V pin). This setup is working with the solar powered RPUno which provides battery power to the VIN pin and can also power down that pin.
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United States Postal Service: Priority Mail
Priority Mail Small Flat Rate Box will hold two RPUno, or two shields (RPUftdi or RPUadpt) and an RPUno.
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I am working on what may be thought of as a garden SCADA system, it is based on securely connecting a host computer through RS-422 to multiple microcontrollers. I have strayed from RS-485 in favor of retaining existing software (e.g. avrdude, picocom, PySerial...) and have an interface that can act like an interactive terminal session.