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Can't Commucation Sim908 Module

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quanghuydck

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Hi, everybody!
I have a problem with sim908 module.
i can't transmit or receive from Sim908. I use max3232 3.3V buffer to Rs232 to PC.
With same schematic I did it before. I can call, send message, add contact,GPS .... Now i can't commucation with Sim908. Please help me i need it to finish my project. This is my schematic.View attachment Sim908.pdf
 

as u have done it b4 this mean there comes some problem with ur h/w or ur justify ur pc hyperterminal by shorting 2,3 pin of db9
 

zia said:
as u have done it b4 this mean there comes some problem with ur h/w or ur justify ur pc hyperterminal by shorting 2,3 pin of db9
Click to expand...
I can't understand your mean Can you guide me fix this problem. I can find error in the schematic. If you need I can give you layout board. Please help me!
 

show me layout i will try to help. i think there is not any error in schemetics as u said that it has worked i think itts drysold problem
 

Okay. This is my layout. I design it by Orcad9.2
 

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  • SIM908 DEPARTERMENT.rar
    37.3 KB · Views: 50

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