hey man, problem here. using arduino uno r3 and saeed gprs shield 2.0 , getting error
“Sending AT query…
Invalid or no response from the device. Please check the modem port and the baud rate.Disconnecting port COM21.
the port number is correct. baud rate is correct.
tried many codes including the one given above. this just isnt working and i am getting frustrated :@
i burned the following code
//Serial Relay – Arduino will patch a
//serial link between the computer and the GPRS Shield
//at 19200 bps 8-N-1
//Computer is connected to Hardware UART
//GPRS Shield is connected to the Software UART
and tested it via
module-tester by m2msupport
it just says no or invalid response from device.