C55/C55i AT COMMAND SET Description Preliminary - Falcom

C55/C55I AT COMMAND SET VERSION 1.00
115200
230400
Notes
• The factory default is autobauding enabled (AT+IPR=0) on ASC0. It
will not be restored with AT&F.
• The current setting of AT+IPR will be preserved when you download
firmware (i.e. a firmware update does not restore the factory setting)
3.7.1 Autobauding
or in the event of power failure.
• Generally, AT+IPR should be used as a standalone command. If
nethertheless combinations with other commands on the same
command line cannot be avoided, there are several constraints to be
considered:
- Avoid combinations with the AT commands listed in chapter
0.4.2.
- Take into account, that a delay of 100 ms is required between the
response to the last command (e.g. OK) and the next command
on the same line.
- When you enter AT+IPR=0, autobauding will be activated after
the response to the last command is received.
- When local echo is active (ATE1) and you enter AT+IPR=X with
other commands you may encounter the following problem: if
switching to the new bit rate takes effect while a response is
being transmitted, the last bytes may be sent with the new bit
rate and thus, not properly transmitted. The following commands
will be correctly sent at the new bit rate.
• In order to account for greater amounts of data it is recommended to
choose a minimum bit rate of 2400 bps.
• A selected bit rate takes effect after the write commands returns OK.
To take advantage of autobaud mode specific attention must be paid to the
following requirements:
• Synchronization between DTE and DCE
Ensure that DTE and DCE are correctly synchronized and the bit
rate used by the DTE is detected by the DCE (ME). To allow the bit
rate to be synchronized simply use an "AT" or "at" string. This is
necessary
- after you have activated autobauding
- when you start up the GSM engine while autobauding is
enabled. It is recommended to wait 3 to 5 seconds before
sending the first AT character. Otherwise undefined characters
might be returned.
If you want to use autobauding and autoanswer at the same time,
you can easily enable the DTE-DCE synchronization, when you
activate autobauding first and then configure the autoanswer mode
(ATSO * 0).
• Restrictions on autobauding operation
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