Entity and instance IDs

Each application must have a unique entity and instance ID to route messages between the processes in the system. Entity IDs are single byte values in the range of 0x00 through 0xFF. Allocate entity IDs as follows:

Range

Usage

0x00 through 0x1F

0x80 through 0xFF

Reserved for system utilities, configuration utilities, and management utilities.

0x20 through 0x7F

Reserved for applications.


Instance IDs identify the processor on which the entity executes. The host is always processor 0 (zero). All host-resident MTP applications must be coded to zero. All tasks on TX board 1 receive an instance ID of 1, all tasks on TX board 2 receive an instance ID of 2, and so on.