Siemens MC55 manual Chronized after restarting the GSM engine see chapter

MC55 AT Command Set

4.7 AT+IPR

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chronized after restarting the GSM engine (see chapter 4.7.1).

Parameter Description

<rate>(num)(&V)

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 (ATE1) 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.

MC55_ATC_V01.05	Page 97 of 469	2/10/04
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