So i develop application that send At commands to modem with Visual basic in serial port with MS Comm Component.
Then the problem is that when i send to at commands one fter other like
Ex of Code :
MSComm1.Output = “AT+CSQ” & Chr$(13)
MSComm1.Output = “AT+CPIN?” & Chr$(13)
In this case for exemple the modem sometimes return error sometimes return the reposne of the second and error for the first. So i’ve not understand the problem if i must after sending the first, wait the reponse of the first before sending the second or there is other solution.