User data section
The user-data section of the OTMA message prefix is variable length and follows the security-data section. It can contain any data.
The user data portion of the OTMA message prefix is mapped by the TMAMUSR DSECT of the DFSYMSG macro.
The following table is a summary of the content of the user-data section of the message prefix. The summary includes, as appropriate, byte, length, content, hexadecimal value, the meaning, and includes usage comments.
| Byte | Length | Content | Description |
|---|---|---|---|
| 0 | 2 | Length | Length of the user-data section, including the length field. |
| 2 | * | User data | The user data. Optional; variable length. |