faster start-up offered by a hot or warm start, a battery backup must be connected. To
maximize battery lifetime, the battery voltage should be between 2.5v and 3.6v.
* PBRES (Push button reset):
This pin provides an active-low reset input to the engine board. It causes the
engine board to reset and start searching for satellites.
* SELECT :
Do not connect.
* TXA :
This is the main transmits channel for outputting navigation and measurement
data to user’s navigation software or user written software.
Output TTL level , 0V ~ 2.85V
* RXA :
This is the main receive channel for receiving software commands to the engine
board from SiRFdemo software or from user written software.
Normally this pin must be kept in high, and if you don’t use this pin please
connect a resistor to pull high.
* Time mark :
This pin provides one pulse-per-second output from the engine board that is
synchronized to GPS time.
* GND :
GND provides the ground for the engine board. Connect all grounds.
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