Messages in this thread | | | Date | Wed, 23 Jun 1999 16:53:58 -0400 (EDT) | From | "Mike A. Harris" <> | Subject | [OFFTOPIC] Detector for modem for driver I want to code |
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I'm in need of a device which will connect to the phone line, and either the printer port or a serial port. The device is to toggle a pin on the printer port when the phone line is currently "busy" due to a voice phonecall in place, or an incoming ring signal. I either want a ready made device, or schematics for one.
It is important that the device takes all phoneline voltages into account including on-hook, off-hook, and RING. I am aware of the voltages, and don't want the 90VAC ring signal on a parallel port pin. ;o)
It is likely to be a very simple circuit indeed. I just don't have the time to devel one, and have no idea where to search on the net for one. I figured someone in this list could point me in the right direction - either a technical mailing list that deals with things like this, or some website or another.
What I'm using it for is this: I want to automate my modem to poll for mail once an hour or so, do a fetchmail and sendmail, and then to log off. I *ONLY* want it to do that though if the line is NOT in use currently (I only have one line). Also, if the modem is allready online, I want my script to just sit idle. So basically, if I'm not online, and not talking voice, I want my script to go out for a mail run and then disconnect. To do so, I need a device to detect if the phone line is not in use.
Someone suggested to me that the modem will not dial if ATX4 command is in the init string, and there is no dialtone. That is true, but that is not what I want because 1) I have to use ATX3 because I have "call answer" and the modem wont dial out if I have messages waiting because it can't detect the dialtone - so I need to force it with X3, and 2) The modem still takes the line off hook with X4 and looks for a dialtone. I've got my phone plugged into the modem, and as such, my voice call will get interrupted by the modem every 30 seconds and I'll get cut off.
So, I really do need this device. Any help would be greatly appreciated. Sorry for the [OT] posting.
-- Mike A. Harris Linux advocate GNU advocate Computer Consultant Open Source advocate
Tea, Earl Grey, Hot...
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