Each application must have a unique entity and instance ID for routing messages among the processes in the system. Entity IDs are single byte values in the range of 0x00 through 0xFF, assigned by the application developer. Entity IDs are allocated as follows:
Range |
Usage |
0x00 - 0x1F 0x80 - 0xFF |
Reserved for use by system utilities, configuration utilities, and management utilities. |
0x20 - 0x7F |
Available for use by applications. |
Instance IDs identify the processor on which the entity executes. The host is always processor 0 (zero). Therefore, all host-resident TUP applications must be coded to 0 (zero). All tasks on TX board number 1 receive an instance ID of 1. All tasks on TX board number 2 receive an instance ID of 2, and so on.