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[SOLVED] 4/5 sim300c connect with PC RS232 port

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sahin5002

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I want to connect 4 or 5 SIM300C GSM module with my PC RS232 port at a time and send them the AT command individually to controlled each module. I am
thinking RS485 is the right way. But i have no experience about RS485.

Can someone help me with the schematic and the sample code.

I can able to connect a single modem with PC serial port.
 

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