Multitech MMH900 User Manual page 133

Appendix D - Command Modem Commands
dialing where actual dial tones are not detected,
instead the command modem relies on timed
pauses. The ATX0 enables the basic result codes
while the ATX1 enables the extended result codes
with call progress disabled on both commands.
The ATX2 through ATX4 commands determine
whether or not call progress is activated and
extended result codes are enabled on each of these
commands.
The ATX2 command waits for a dial tone before
dialing. The connect response and speed indication
(e.g., CONNECT xxxx where as xxxx is the connect
speed of 2400 bps) are enabled upon detection of a
dial tone. Busy signal is not detected.
The ATX3 command causes the command modem
to dial blind (i.e., does not wait for dial tone) and
enable a BUSY result code if a busy signal is
detected. This feature is useful because it allows
the command modem to immediately abandon a call
rather than wait the thirty seconds for a carrier signal
that will never come.
The ATX4 command causes the command modem
to wait for a dial tone before dialing. This command
is referred to as the smart dialing method where as
the ATX3 command is referred to as blind dialing.
The CONNECT xxxx result codes are activated and
the BUSY result code is enabled if a busy signal is
detected from the called command modem. The
ATX4 command is the factory default setting.
The Result Code Set/Call Progress X commands
are summarized below.
ATX0 Basic result codes are enabled. Dumb
dialing (dial tone and busy signal) capability is
provided.
ATX1 Extended result codes are enabled. Dumb
dialing capability is provided.
ATX2 Wait for dial tone before dialing is enabled.
Extended result codes are enabled. Busy signal is
not detected.
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