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ATR Set Terminal Speed
The R command allows you to switch off “autobauding” and specify the terminal speed at
which your modem operates.
Normally your modem uses autobauding, meaning that when you issue commands to your
modem, it automatically detects the speed at which you issue the commands and changes its
terminal speed to match your computers terminal speed. For example, if your computer is set to
a terminal speed of 9,600 bps and you change it to 19,200 bps, when you next issue an AT
command to the modem, the modem detects the command was issued at 19,200 bps and changes
its terminal speed (that is, the modems terminal speed) to 19,200 bps.
When autobauding is switched off, your modem does not does not change its terminal speed to
match your computers terminal speed. For example, if you set your modem to use a fixed
terminal speed of 26,400 bps, all AT commands must be issued to the modem at 26,400 bps. If
you issue commands to your modem at another speed, the modem will not accept the
commands.
When using locked speeds or autobauding at 230kbps, the character format and parity is
specified by the AT+ICF command. the defaultis 8 bits, no parity.
Your modem can autobaud at 1,200 bps through to 230,400 bps.
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IBM PC and compatible computers cannot support some of the high speeds
provided by your modem. If you wish to use terminal speeds above 19,200 bps, we
recommend you install a serial card fitted with 16550 chip. This ensures reliable
operation at high speeds when used with the correct drivers and software setup.
If you wish to set your computer terminal speed to another speed, you must issue the
appropriate R command immediately prior to setting the computers terminal speed.
Options
ATR0 ■ Autobaud enabled
ATR1 1200 bps (locked terminal speed - no autobaud)
ATR2 2400 bps (locked terminal speed - no autobaud)
ATR4 4800 bps (locked terminal speed - no autobaud)
ATR7 7200 bps (locked terminal speed - no autobaud)
ATR9 9600 bps (locked terminal speed - no autobaud)
ATR12 12,000 bps (locked terminal speed - no autobaud)
ATR14 14,400 bps (locked terminal speed - no autobaud)
ATR16 16,800 bps (locked terminal speed - no autobaud)
ATR19 19,200 bps (locked terminal speed - no autobaud)
ATR21 21,600 bps (locked terminal speed - no autobaud)
ATR24 24,000 bps (locked terminal speed - no autobaud)