Echelon ISI - Manual (Page 105)

103 ISI Programmer’s Guide
Appendix A
API Data Types
This appendix describes the data types used by the ISI
library. Byte offset values shown refer to the IsiMessage
structure, starting with IsiMessageHeader at index 0.
This ISI API reference describes the ISI API for Neuron C,
and uses the Neuron C programming model. The Neuron C
language employs a 1-byte-centric, big-endian, programming
model. The char, int, short, and enum types all use a single
byte. The long type uses 2 bytes in big-endian ordering.
Bitfields are arranged in big-endian order within a single byte
boundary. Aggregate packing is 1, aggregate padding is 0.
The Neuron C language boolean constant FALSE has a value
of 0 (zero) and the boolean constant TRUE has a value of 1,
Any non-zero value is evaluated as true in a boolean
expression, and any function returning a boolean value may
return any non-zero value.