On Fri, Sep 29, 2000 at 07:16:15AM -0600, Ayers Family Member wrote:
> I want to create a program that sends data over phone lines to a PC using
> the modem.
>
> Jeff Ayers
Modems 101...
Check the manual (the technical one - should be included or on most
vendor sites) for the "AT" commands. I think these were originally
established by the Hayes corporation.
Basically you use AT[command], and get a numeric or string status code.
ATZ is the reset command. You normally get OK in response.
ATD dials and takes parameters, e.g.
ATDT5551212 dials using touch tone (the T after the D).
ATDP9,1-555-1212 dials using pulses, first dialing 9, pauses, then
dials the number. The hyphens are ignored.
(these tend to vary a bit by manufacturer).
If the phone rings you should see "RING".
You can use ATA to answer the phone.
In either case if the modems establish a connection, you should see
"CONNECT" or connect followed by the speed of the connection.
You can then send data to or from the PC.
To exit, send the string "+++" but with no characters for 1 second
before and after, and it will return to the command mode (where it
takes AT commands, "ATH" is the hangup command). On most modems you
can also simply drop the DTR modem line signal and it will hangup.
You can see some of this in the connect scripts for the network prefs
panel. Basically they use AT commands.
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