DR + GPS
STARTER KIT REFERENCE MANUAL
Lassen DR + GPS Reference Manual 50
HIPPO has three classes of command message packets: set parameters, query
parameters, and system command.
The set command is simple: it “wraps around” the report message structure of
the parameter(s) to be set.
The query command structure is even simpler: it calls out the report code and
subcode (and index, if applicable) of the desired reports.
The module always acknowledges a command in one of two ways.
An explicit acknowledgment message is sent in reply to either:
1. A command;
2. An unsuccessful query;
3. A query that generates a series of report messages.
4. If the query successfully generates a single report message, that
message is the implicit acknowledgment.
The acknowledgment contains a status indicating the completion of the operation.
Set Class
The set class packets set receiver, system, and any other defined parameters
within the target system.
Two types of parameters can be set.
1. Configuration parameters such as DOP mask;
2. Initialization parameters such as position, velocity, time, and ephemeris.
The target system returns an acknowledgment packet, but does not echo data
values as in TSIP.
The parser code and subcode determine the length of the command packet. The
packet has the following general format (indexed data has an extra byte after
parser subcode):