User`s guide

Chapter 5 - I/O Commands
12 CHANNEL SELF-TEST MESSAGE (@@Ia)
The M12+ receiver user has the ability to perform an extensive self-test. The tests that are
accomplished during the Self-Test are as follows:
• Antenna connection
• RTC communication and time
• Temperature sensor
• RAM
• FLASH ROM
• Correlator IC
The output of the self-test command is a 24-bit field, where each bit of the field
represents the Pass/Fail condition for each parameter tested. Passed tests are indicated by a
logic '0', while failed tests are indicated by a logic '1'.
When the self-test is initiated, the next output message may not be the response. The self-test
may take up to ten seconds to execute. Once the self-test is complete, the satellite acquisition
process starts restarts as when the receiver was first powered on. The date, time, position,
almanac and ephemeris information is all retained.
Motorola GPS Products - M12+ User's Guide Revision 6.X 09FEB05
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