Hi am trying to find out the required AT command set for a microcontroller to connect through rs232 to a modem and call a number. i can do so with hyperterminal with ATDT then number. is this sufficient for the pic to send this.
With AT set do i need to ECHO (E1)? Set Baud rate? Set Asyncronous(&Mn)
Any HELP please
"Rembember that most modems wants a two-character \r\n end-of-line."
Incorrect.
Modems expect a single command line termination character - this is specified by register S3, and is usually CR.
There is also the response formatting character, specified by S4, that the modem sends at the end of its responses - this is usually LF.
Thus, at the end of a command you send CR, the modem echoes the CR and appends LF.