Our Solution - Protocol


Compatible with existing AMSAT IHU software (IPS)
Match CPU upgrade in IHU-3 with upgraded I/O

Very simple conceptual model
Stateless, efficient use of CAN bus (unlike AO-40!)
In typical use, complete state refresh every 20ms
Allows for background use of CAN bus by experiments

Modules support 3 modes
normal mode
multiplexed I/O mode using external latches
"byte pipe" mode