Our Solution - Hardware Match CPU upgrade in IHU-3 with upgraded I/O Hardware Based on Atmel CANary (8051 thingy with CAN) 24 x 75 mm circuit board... 12 digital outputs, 8 digital inputs, 8 analog inputs power switching for module Protocol Very simple conceptual model - Distributed I/O Mux Compatible with existing AMSAT IHU software (IPS)