CONTENTS
Home
TECHNOLOGY
Message IDs
Layer-2 Driver
MM2.h
Layer-7 API
MM7.h
|
|
Using an 8-bit Message Identifier
Per default, MicroMessaging uses an 8-bit message identifier and allows
for a total of 31 nodes (based on a 3-bit Node ID with node '0' being
reserved). In the pre-defined connection set
the 5 least significant bits are used for the node ID and the 3 most
significant bits define the function code.
| Bits 7..5 |
Bits 4..0 |
| Function Code (0-7) |
MicroMessaging Node ID (1-31) |
Default Message Identifier Assignment
The following table lists the default message identifier assignment of
MicroMessaging.
Function
Code |
Node
ID |
Message
ID |
MicroMessaging
Usage |
| 0 |
0 |
00h |
Master Control Message |
| 0 |
1-31 |
01h-1Fh |
Emergency |
| 1 |
0 |
20h |
Poll Message |
| 1 |
1-31 |
21h-3Fh |
Process Data Channel 1 |
| 2 |
0 |
40h |
Reserved |
| 2 |
1-31 |
41h-5Fh |
Process Data Channel 2 |
| 3 |
0 |
60h |
Reserved |
| 3 |
1-31 |
61h-7Fh |
Process Data Channel 3 |
| 4 |
0 |
80h |
Reserved |
| 4 |
1-31 |
81h-9Fh |
Process Data Channel 4 |
| 5 |
0 |
A0h |
Reserved |
| 5 |
1-31 |
A1h-BFh |
Service Data Request Channel |
| 6 |
0 |
C0h |
Reserved |
| 6 |
1-31 |
C1h-DFh |
Service Data Response Channel |
| 7 |
0 |
E0h |
Master Status |
| 7 |
1-31 |
E1h-FFh |
Slave Status |
|
