| Message identifier bits | |||||||||||
| 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| CANopen | Function code (015) | CANopen node ID (1127, 0 reserved) | |||||||||
| MicroMessaging | Unused (8-bit only) | Function code (07) | MicroMessaging node ID (131, 0 reserved) | ||||||||
Table 1The message identifier used in CANopen (11 bits) and MicroMessaging (e.g., 8 bits) is divided into a node ID field, which allows addressing a specific node, and a function code field, which specifies the contents of the message (e.g., one code is used for service requests sent to the node).