Specifications

Software Interface 45
3.3.3.2 Message Format
A message consists of a fixed-size header, followed by a variable length
block of data. Figure 3-6 shows the format of messages.
MA-0560-88
Figure 3–6 Message Format
MSGTAG
The MSGTAG field holds a copy of the MSGTAG field in the command
that prompted DECvoice to return a message. The message tag informs
the driving software which messages belong with which commands.
DECvoice does not interpret the message tag. The message tag is only
significant to the driving software.
Slot
The slot field identifies the subsystem that produced the message. This
field in a message has the same value as the corresponding slot field in
the command that prompted the message.
Type
This field indicates the purpose of the message and defines the format of
the data portion of the message.
Status
This field provides further information about the message.
Data[ ]
There may be data fields in a message that contain special information
specific to that message.