5. ptf 3203A GlobalTyme – Operation
5.1. Initialization
From software version 23-2 and onwards the initialization process has
been re-organized in order to bring up the Ethernet and keypad functions
more rapidly.
Due to this the unit will begin to display a time output more quickly,
however it should be noted that this displayed time is not synchronized
until after the GPS receiver module has been initialized, indicated by the
flashing Green “Hold” LED.
The following steps are part of the initialization process:
Verification of compatible s/w version and CPLD firmware
Restoration/initialization of stored “flash” memory parameters
Initialization of Ethernet functionality
Synchronization of internal oscillator 1PPS
Restoration of time/load dummy time
Initialization of front panel keypad (if fitted)
Initialization of GPS module
Initialization of internal Oscillator phase locked loop
Initialization is completely automatic but the elapsed time varies
depending on the prior conditions. When the receiver is powered up for
the first time after installation, the initial date, time, position, almanac, and
ephemeris data will be incorrect. This condition forces the receiver into
cold start, and it searches for all available satellites. After one satellite is
acquired, date, time, almanac and ephemeris data is updated. When
three or more satellites are tracked, automatic position computation is
initiated.
5.2. Entering Position Information
Position information is locked when the unit is in fixed positioning mode.
If the user desires a fixed position the unit should be in survey mode to
allow changing the fixed position. This also allows for setting all position
information to the receiver at the same time.
5.3. DB9 RS 232 Control/Monitor Port
5.3.1. Configuration
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