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X-Hacker.org- Telix/SALT v3.15 & RS-232, Hayes - modems often have a set of eight dip switches for configuring.
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Modems often have a set of eight DIP switches for configuring.
They usually look like this:
- - _ _ _ - - _
1 2 3 4 5 6 7 8
1. Should be UP so that DTR (Data Terminal Ready) is
obeyed. Otherwise the modem ignores the computer when
it lowers DTR to request a hang up. This can later be
overridden with the &D2 command.
2. Should be UP to request verbal result codes such as
CONNECT or BUSY rather than incomprehensible numeric
codes. This can later be overridden with the V1
command.
3. Should be DOWN so that the modem presents result codes
to the commands it receives. If it were UP, the modem
would play dumb and give no responses whatever. This
can later be overridden with the Q0 command.
4. Should be DOWN so that the modem does not echo commands
back to the computer. If it were UP, the modem would
back-talk every command the computer gives it along
with the result of the command. This can later be
overridden with the E0 command. Some software may
require this switch to be UP.
5. Should be DOWN to suppress auto answer. THIS IS VERY
IMPORTANT. Even if you send a modem init string
containing S0=0 to suppress auto answer, your modem
will still answer the phone during the interval between
when it is first powered on and when you first run your
modem software.
6. Should be UP to have normal DCD -- Data Carrier Detect.
Otherwise your modem will lie to your computer that the
other modem is still attached and working even when it
has hung up. This can later be overridden with the &C1
command.
7. This should usually be UP for normal single-line
phones. It should be DOWN for multi-line phones. You
can later override this with the &J0 command.
8. This should be DOWN to enable the modem's intelligence.
If it were UP, the modem would totally ignore all the
commands you send it -- emulating an old-fashioned dumb
modem.
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