EPCCS.ORG webhosting will end on January 1, 2017. Some boards and firmware have moved to GitHub and rpubus.org
Shields with RS-422 full duplex communication (RX and TX) and a RS-485 half duplex out of band management channel. Node boards with embedded bare metal MCU, built-in solar charge controller, pluggable terminals for the application interface, headers compatible with Arduino Uno (not Mega) shields, and DIN Rail mounting. The Sensors [HMLP]T are Capacitive with Thermistors and send a pulse over a current loop. OneShot, and VR (variable reluctance) also send a pulse over a loop. TT is yet another. A node (e.g. RPUno) has ICP input(s) to capture the pulse event timing. Driver CL8 is used to select power to a loop sensor, while K3 is used to latch solenoids.
Copyright (C) 2016 Ronald S Sutherland