Siemens MC55 - Manual (Page 97)

MC55 AT Command Set
4.7 AT+IPR
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MC55_ATC_V01.05 Page 97 of 469 2/10/04
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chronized after restarting the GSM engine (see chapter 4.7.1 ).
Parameter Description
bitrate per second (bps)
0 Activate autobauding (see chapter 4.7.1 ). This is not supported on ASC1.
300
600
1200
2400
4800
9600
14400
19200
28800
38400
57600
115200
230400
Notes
• The factory default is autobauding enabled (
AT+IPR
=0) on ASC0 and 57600bps on ASC1. 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) or in the event of power failure.
• Generally,
AT+IPR
should be used as a standalone command. If nethertheless combinations with other com-
mands on the same command line cannot be avoided, there are several constraints to be considered:
- Avoid combinations with other AT commands.
- Take into account, that a delay of 100ms 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 (
ATE
1) and you enter
AT+IPR
=x with other commands you may encounter the
following problem: if switching to the new bitrate takes effect while a response is being transmitted, the
last bytes may be sent with the new bitrate and thus, not properly transmitted. The following commands
will be correctly sent at the new bitrate.
• In order to account for greater ammounts of data it is recommended to choose a minimum bitrate of 2400 bps.
If the ME is operated in Multiplex mode we suggest a minimum bitrate of 4800bps.
• When you run the multiplex mode, the write command
AT+IPR
=
<rate>
won't change the current bitrate but
the new bitrate will be stored and becomes active, when the module is restarted.
<rate>
(num)(&V)