The problem is that Nano receives all the signals from SIM900A like - call ready ,CPIN and all but when I try to send the AT commands from Nano, it does not respond. Help me.
Connected SIM900A RX TX to pins 10 and 11 on NANO. Baud Rate Serial is 9600 and for this port it is 9600 also. The SIM900 has no other connections except the TX RX pins. The modem is already powered up. Any other information can be provided if required. Help pls
The modem is working perfectly when I directly connect it to serial PC port. and then using that M2M website do the serial AT command testing.
What might be the problem.