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Sim 548 debug port not working

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gauravpatni55

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hi..
i have 8 sim 548 modules..
i have connected DEBUG RXD & TXD pin to max 232 to view data on hyperterminal but i am not gatting any thing...
but when i connect to modules txd& rxd i can communicate with module...
in data sheet on debug port section it is written that "/RXD" & "/TXD" is it different than normal RXD & TXD ???
plz help..
 

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