Initial SIM800c

Thread Starter


Joined Mar 1, 2017
Hi all. I have 1 project use SIM800c to send and recieve SMS.
I powed up SIM800c (using PWKEY pin).
If i don't send "AT" command, then i call to sim800c, sometimes Sim800c do not send data via uart. but, if i send "AT" command then i call, Sim800c send data via uart.
so i have a question: have i send "AT" command to initial Sim800c?