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Debug interface when using embedded applications with GT 47
2 Modification of the hardware interface for the GT47
The required modification to the GT 47 is described here and should only
be done to development units
This feature is used if a customer wants to operate the GT47 in his
embedded environment with the SIM card inserted and still extract logging
data for debug purposes.
2.1 Assembly picture
GT47/GT48 Motherboard showing solder pads by SIM card holder
Pad 1:
Internal GT47
3.8V Supply
Pad 2:
Enable debug mode
after shortening to
3.8V Supply
LZT 123 7717 R1B
Pad 4:
Signal GND
Pad 3:
Serial debug
data stream
(RD3)
5
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