Interfacing wavecom with microcontroller

i need to send at commands to wavecom from microcontroller,my doubt is
1)if i am sending command “at+cfun=1” ,should i give delay before sending CR/LF,if so how much delay should i give?


You should not send CRLF - the correct terminator for at AT command is just CR.

(the modem will echo CRLF)

Why do you think that a delay might be necessary?