sim900a gsm/gprs problem with AT commands

[deebakece]

I am using sim900a... when i am connecting with pc through serial(rs232) or via usb (prolific usb to serial converter)port its getting detected and i could able to connect using rsterm as well as hyper terminal.. it displays that +cfun 1,+cpin ready, call ready that means sim card is working fine registered with network.. but when i give AT commands it doesnt replies back anything.. what may be the problem its not working with any commands.. i set baud rate 9600,8bit,flow control none,parity none,stop bit 1... anyone suggest pls what may be the reason..

Thanks in advance..!

 

[nandhu015]

Re: sim900a gsm/gprs problem

It is hardware problem, Check usb to serial converter and rs232 circuits.