Download Dolphin MCC6 Specifications

MC55 AT Command Set
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4.7 AT+IPR
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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 corrupted.
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 determined, the following constraints apply:
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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.
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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.
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Autobauding and multiplex mode
If autobauding is active you cannot switch to multiplex mode (see AT+CMUX).
MC55_ATC_V03.03
Confidential / Released
Page 92 of 459
9/9/05