Input message descriptor byte (Finance)
If the message length is more than 2 bytes, IMS interrogates the message description to determine whether an MFS MID name is present. The format description specified by the MID name is used to format the message.
The format of the message descriptor byte is:
- Bit 0
- Reserved
- Bit 1
- Page advance requested (NEXTPP)
- Bit 2
- Message advance requested (NEXTMSG)
- Bit 3
- Message advance protect requested (NEXTMSGP)
- Bit 4
- Next logical page requested (NEXTLP)
- Bit 5
- Reserved
- Bit 6
- Format description that is indicated by the MID name length and MID name fields should be used to format this input message.
- Bit 7
- Reserved
Bits 1, 2, 3, and 4 (MFS control requests) are mutually exclusive and are examined only if the message length is 2 bytes. Bit 6 must be set on if the input message is to be formatted by an MFS MID name. If bit 6 indicates an MFS MID name is present, bits 0 through 5 must be zero.