Post by thread:send DTMF tones

Using an external modem, I need to do the following things: 1. dial a number 2. detect if the call is answered 3. send DTMF tones to the remote phone I can do 1. with the command ATDT... I can do 2. detecting when the ringback signal stops I don't know how to do 3. Any hint ? Thank you Duilio Foschi

there is an appnote on uchip's website on producing DTMF from a pic, but I use a tel-tone device (m-8880) to do DTMF send and receive and it works quite well -dan -----Original Message----- From: Duilio Foschi [spam_OUTfoschidTakeThisOuTSHUTTLE.ETRURIA.NET] Sent: Sunday, October 24, 1999 2:56 PM To: .....PICLISTKILLspam@spam@MITVMA.MIT.EDU Subject: send DTMF tones Using an external modem, I need to do the following things: 1. dial a number 2. detect if the call is answered 3. send DTMF tones to the remote phone I can do 1. with the command ATDT... I can do 2. detecting when the ringback signal stops I don't know how to do 3. Any hint ? Thank you Duilio Foschi

> > Using an external modem, I need to do the following things: > > 1. dial a number > 2. detect if the call is answered > 3. send DTMF tones to the remote phone > > I can do 1. with the command ATDT... > I can do 2. detecting when the ringback signal stops > > I don't know how to do 3. Sending DTMF is just like dialing, you can use an ATDT. Instead of doing 2) though you can simply put a bunch of commas between the dial and the DTMF tones you want to send so: ATDT8005551212,,,,,,,,,,,,,1234567 Should accompish the task. This is what I used to do to automatically send pager messages. Worked like a champ. BAJ

I assume you are going to detect the answering of the call somehow external to the modem? One suggestion I would have is to append a semicolon (I think - Check your modem manual) to the dial string because it will return it to command mode after dialing, so that you can then send another ATDT command once you have detected the call being answered. If you don't, then the next character you send to the modem will cause the modem to hang up unless it has already received carrier. -Steve {Original Message removed}

see: http://www.rt66.com/dthomas/pic/dtmf.txt and other links at http://204.210.50.240/techref/default.asp?url=pots.htm under "See also" and "DTMF" James Newton jamesnewtonKILLspamgeocities.com phone:1-619-652-0593 http://techref.homepage.com NOW OPEN (R/O) TO NON-MEMBERS! Members can add private/public comments/pages ($0 TANSTAAFL web hosting) PICLIST guide: http://204.210.50.240/techref/default.asp?url=piclist.htm {Original Message removed}

> Using an external modem, I need to do the following things: > > 1. dial a number > 2. detect if the call is answered > 3. send DTMF tones to the remote phone > > I can do 1. with the command ATDT... > I can do 2. detecting when the ringback signal stops > > I don't know how to do 3. > > Any hint ? > > Thank you > > Duilio Foschi http://www.dontronics.com/stamp.html#pager should help you out Don McKenzie .....donKILLspam.....dontronics.com http://www.dontronics.com Don's Download Dungeon: http://www.dontronics.com/download.html Australian Electronics Ring http://www.dontronics.com/aering.html Win $500USD Cash. Micro design contest: http://www.simmstick.com