Siemens MC55 Manuel d'utilisateur télécharger pdf (Page 97)

100

101

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 (

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.

<rate>

(num)(&V)

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Siemens MC55 Manuel d'utilisateur Page 97

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