User's Manual

Boomer II User Manual & Integrator’s Guide ________________________________ Message Routing and Migration
BM210012WT27 99 Wavenet Technology
Host Request Message Header Fields
Save Bytes Supplied by the host and used by the network to tie
the confirmation to the original host request. Save
bytes are ASCII for DataTAC 4000 systems. Save
bytes can be ASCII or binary for DataTAC 5000 and
6000 systems.
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 ‘I’ ‘B’ for
DataTAC 4000 systems. Use ‘H’ ‘R’ for the other
systems.
LLI Identifies the subscriber terminal to which the
message is being routed. 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 in this list.
Delivery
Option
DataTAC 4000 systems allow four priorities for a
message in the Priority field. Other systems allow two
delivery options: Send once and quit; send and queue
until delivered or timed out.
Confirmation
Mode
On DataTAC 4000 systems this is also known as
Acknowledgment Indicator. On all systems this mode
allows the host to specify the conditions under which
a confirmation message is returned for the message
being submitted.
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 portion of the
message.
Information For all systems, these fields include the data header
and user data for the application.