User's Manual

SIM548C EVB User Guide
SIM548C-EVB_ UGD _V1.01 04.05.2008
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The other is passive antenna, if the customer want to use passive GPS antenna to demo GPS,
there is no need to provide power to the antenna.
6.1.2 Tracking the satellite signals
(1) Connect the serial port line to the GPS_COMA serial port
(2) Connect the GPS antenna to the module using an antenna transmit line
(3) Run the GPS part of the module as 6.1.1 described
(4) Then you will see the information transmitted by the GPS_COMA serial port in our demo tool
or through Hyper Terminal (AT Command widow)
6.1.3 Downloading
(1) Connect the serial port line to the GPS_COMA serial port,.
(2) Connect the direct current source adapter
(3) Switch shifter S103 on RUN state and shifter S104 on the D/L state
(4) Switch shifter S102 on the ON state and shifter S106 on the GPS_RXA state. (See note)
(5) Switch shifter S107 on the ON state
(6) Run the download program and press the execute key, and then the download procedure is
executing immediately.
Note: Step (4) is only for the judgement while program downloading form the PC side by the
glittering of the LED on EVB board, if you don’t need this visual indication or you can judge by
the response of the download program on the PC side directly, you can jump to step (5) directly
。
6.1.4 Turn off and Reset
(1) Turn off: Switch shifter S107 on the OFF state, that will cut the power supply for the GPS part
directly, and then the GPS part of the module will be turned off immediately.
(2) Reset: Press the button Z102 and release it lightly, the GPS part of the module will reset
immediately, it’s necessary when system is running on a emergent state or encountering a
unpredictable malfunction and so on .