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.
☞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) |
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