Motorola M12 Oncore User's Guide download pdf (Page 35)

Chapter 3 – Receiver Description

Motorola GPS Products - Oncore User’s Guide

Description of

Motorola Binary

Format (Continued)

Motorola Binary Format (Continued)

You must take care in correctly formatting the input command. Pay particular

attention to the number of parameters and their valid ranges. An invalid message

could be interpreted as a valid unintended message. A beginning CSC, a valid

checksum, a terminating carriage return line feed, the correct message length and

valid parameter ranges are the only indicators of a valid input command to the

Oncore receiver. For multi-parameter input commands, the Oncore receiver will

reject the entire command if one of the input parameters is out of range. Once the

input command is detected, the Oncore receiver validates the message by checking

the checksum byte in the message.

Input and output data fields contain binary data that can be interpreted as scaled

floating point or integer data. The field width and appropriate scale factors for each

parameter are described in the individual I/O message format descriptions. Polarity of

the data (positive or negative) is described via the two's complement presentation.

Input command messages can be stacked into the Oncore receiver input buffer, up to

the depth of the message buffer (1200 characters long). The Oncore receiver will

operate on all full messages received during the previous one second interval and

will process them in the order they are received. Previously scheduled messages

may be output before the responses to the new input commands.

Every input command has a corresponding output response message. This enables

you to verify that the Oncore receiver accepted the input command. The Oncore

receiver response to properly formatted commands with at least one out-of-range

parameter is to return the previous unchanged value(s) of the parameter(s) in the

response message.

Input commands may be of the type that change a particular configuration parameter

of the Oncore receiver. Examples of these input command types include commands

to change the initial position, the Oncore receiver internal time and date, satellite

almanac, etc. These input commands, when received and validated by the Oncore

receiver, change the indicated parameter and result in a response message to show

the new value of the parameter that was changed. If the new value shows no

change, then the input command was either formatted improperly, or one of the input

parameters was out of its valid range.

NOTE: Every change-parameter type input command has a corresponding

response message showing the configuration parameter change. To request

the current status of the Oncore receiver, enter an input command with at

least one out-of-range parameter. The response to properly formatted

commands with out-of-range parameters is to output the original unchanged

value of the parameter in the response message.

Input commands may also be of the type that enable or disable the output of data or

status messages. These output status messages include those that the external

controller will use for measuring position, velocity, and time.

Revision 5.0 08/30/02

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Motorola M12 Oncore User's Guide Page 35

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