MC75 AT Command Set

MC75 AT Command Set
4.9 AT+IPR
s
sent at the previously detected bit rate or, after ME restart, at 57600 bps.
- 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.
- When autobauding is switched on:
+ only data length, parity and baud rate are automatically detected
+ if using 1 stop bit, AT+ICF=1 should not be used, because it uses 2 stop bits
+ if using 2 stop bits, no combination of AT+ICF should be used, which uses 1 stop bit
• 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:
- 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 AIRPLANE 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).
MC75_ATC_V01.001 Page 96 of 475 6/2/05
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