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Com Ports - Technical Information - Standard Modem Commands

MSDN

Standard Modem Commands

Command Description
AT Initialization code. You need to send this code before sending any other commands.
D Tells the modem to dial a number. You can place a P or T after the D command specifying Pulse or Tone dial, respectively. Then, put the number you want to dial. For example,
ATDT01992354987
would dial 01992354987 using Tone dial. You usually use Tone dial rather than pulse dial (which is the old rotary dial system).
A/ Redial (AT is not required)
H0 Hangs Up
H1 Goes off hook
ATI3 modem Information
E0 Echo off (your command is not returned in the result)
E1 Echo on

If you have some more commands you would like to add, contact me.

Comments

  • Posted by eky on 24 Aug 2004

    Hi U
    Can U show me some page ,apllicate this code by VB . U can send my mail kychinh2002@yahoo.com
    thanks,i need it so much

  • Posted by eky on 24 Aug 2004

    Hi U
    Can U show me some page ,apllicate this code by VB
    thanks,i need it so much

  • Posted by jainsapna on 04 Aug 2004

    i am using mscomm with visual basic. i want to read/write data on serial port rs232. what code will i have to write and what properties i will have to change in mscomm. please help me as soon as possi...

  • tutorial is good indeed

    Posted by vbgeek on 03 Mar 2004

    However, i think you need to perfect it more on a particular section ....

    Do you know what command to issue so that when i call up the receiver's HP, i can get to know whether the receiver phone i...

  • receive binary data from mscomm

    Posted by fycz on 16 Dec 2003

    do your problem has solved?
    I meet the same problem now, visual basic text doesn't give any response to binary input.

    I really need your solution, if you already have it

    thanks