User`s guide

Chapter 3 - Receiver Descriptions
example, if messages totaling 334 bytes are scheduled to be sent, and the user requests
another 80 byte message, then 414 bytes will actually be sent. If the user requests yet another
70 byte message, then its output will not be generated. The order for priority of transmitting
messages is simply alphabetical.
The NMEA messages are input and output on the primary serial port just as in binary mode. For
further details on the command formats see Chapter 5 of this document.
RTCM Differential GPS Support
The M12+ positioning receiver supports the RTCM SC-104 format for the reception of differential
corrections. The receiver employs a decoding algorithm that allows the unit to directly decode the
RTCM Type 1 and Type 9 messages input on the second serial port (pin 5) at 2400, 4800, or
9600 baud. Having a separate port allows the M12+ to simultaneously accept the RTCM format
data stream on the second port and process normal receiver input/output on the main port.
Motorola GPS Products - M12+ User's Guide Revision 6.X 09FEB05
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