• State Not Answered
  • Locked Locked
  • Replies 6 replies
  • Subscribers 21 subscribers
  • Views 1324 views
  • Users 0 members are here
2025 survey

We are running a survey to help us improve the experience for all of our members. If you see the survey appear, please take the time to tell us about your experience if you can.

Options
Related
How was your experience today?
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

PIC16f877 to make modem call a number

dean harris

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

Parents
  • 0 in reply to Per Westermark

    "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.

Reply
  • 0 in reply to Per Westermark

    "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.

Children
No data