User's Manual

Boomer II User Manual & Integrator’s Guide ________________________________ Message Routing and Migration
BM210012WT27 103 Wavenet Technology
Mobile Information Message Header Fields
Length Prefix DataTAC 5000 systems require all SCR
messages to designate the length of the
message. The length count does not
include the length prefix itself, but does
include everything else in the message
packet.
Type Code Identifies the type of the SCR message:
Use ‘O’ ‘B’ for DataTAC 4000 systems.
Use ‘M’ ‘I’ for the other systems.
LLI Identifies the subscriber terminal from
which the message is being received. On
DataTAC 4000 systems the field (also
known as Terminal ID) is ASCII-
encoded in 8 bytes. On the other systems
it is binary encoded in 4 bytes (the first
four bytes of this 8-byte field are
reserved).
Format Indicator Used in DataTAC 4000 systems only, to
specify the format of the data in the user
data section of the message. This field is
reserved on the other systems and
handled by their format field, as noted
below in this list.
Delivery Option DataTAC 4000 systems allow 4
priorities for a message in the field
formerly known as Priority. The
Delivery Option field is reserved on the
other systems.
Format For DataTAC 5000 and 6000 systems
only, a fixed value set to $15 (hex). This
field replaces the format indicator field
on DataTAC 4000 systems.
Format Dependent For DataTAC 5000 and 6000 systems
only, a fixed value set to $C0 (hex).
Data Header Offset On DataTAC 4000 systems this field is
also called Data Header Size. On all
systems it specifies the number bytes in
the data header of the information
section of the message.
Information For all systems, these fields include the
data header and user data for the
application.