1.1.2 Binary
Binary messages may be output from the DGPS MAX receiver, the Mini
MAX receiver, the PowerMAX receiver, the Vector, the Vector PRO, the
Vector Sensor, the Vector Sensor PRO and the Vector OEM along with
NMEA 0183 data. Binary messages have a proprietary definition that likely
will require custom software support if you wish to use it. Binary messages
inherently are more efficient than NMEA 0183 and would be used when you
require maximum communication efficiency. Use of binary messages for
most users is not recommended as the NMEA interface allows you to
control the operation of the receivers and also receive all necessary data
regarding status and positioning information.
The receivers support a selection of binary data messages that provide
improved communication port efficiency. Additionally, certain data is
available only in binary format, such as raw measurement information.
Note - The binary messages described in this chapter are turned
on or off using the $JBIN and $JOFF commands discussed in
Chapters 3 and 4.
1.1.2.1 Binary Message Structure
The Binary messages supported by the receivers are in an Intel Little Endian
format for direct read in a PC environment. You can find more information
on this format at the following Web site.
www.cs.umass.edu/~verts/cs32/endian.html
Each binary message begins with an 8-byte header and ends with a carriage-
return line-feed pair (0x0D, 0x0A). The first four characters of the header is
the ASCII sequence $BIN.
The following table provides the general binary message structure.
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