MC55_ATC_V04.00 Page 94 of 475 3/17/06
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- It is not recommended to switch to autobauding from a bit rate that cannot be detected by the autobaud
mechanism (e.g. 300 bps). Responses to AT+IPR=0 and any commands on the same line might be cor-
rupted.
• Autobauding and bit rate after restart
The most recently detected bit rate is stored when the ME is powered down (with AT^SMSO). Therefore, each
time the module is restarted the correct bit rate must be found as described above. Unless the bit rate is deter-
mined, the following constraints apply:
- An incoming CSD call or a network initiated GPRS request cannot be accepted. This must be taken into
account when autobauding and autoanswer mode (ATS0 ≠0) are enabled at the same time, escpecially
if SIM PIN 1 authentication is done automatically and the setting ATS0 ≠0 is stored to the user profile with
AT&W.
- Until the bit rate is found, URCs generated after restart will be output at 57600 bps. This applies only to
user defined URCs, such as "+CREG", "CCWA", "^SCKS" etc. The URCs "^SYSSTART", "^SYSSTART
CHARGE-ONLY MODE" and "^SYSSTART ALARM MODE" will not be indicated when autobauding is
enabled.
Note: To avoid any problems caused by undetermined bit rates in the direction from TA to TE we strongly
recommend to configure a fixed bit rate rather than autobauding.
• Autobauding and multiplex mode
If autobauding is active you cannot switch to multiplex mode (see AT+CMUX).
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