Siemens AC75 Manual De Usuario

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AC75_ATC_V01.002

Page 118 of 569

10/30/06

Confidential / Released

- The TA cannot distinguish between 1 and 2 stop bits. Therefore, 1 stop bit will be used by the TA. 
- The command 

 cannot be used.

- Only the first "AT" or "at" after restart of the module can be detected (neither "At" nor "aT"). This means

that all the AT commands have to use the same bit rate and frame type. 

- The second serial interface ASC1 does not support autobauding. 
- Autobauding cannot be used if the ME operates with Java. 
- URCs that may be issued before the ME detects a new bit rate (by receiving the first AT character) will be

sent at the previously detected bit rate or, after ME restart, at 115200 bps.

• Autobauding and bit rate after restart:

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 (

≠ 0) are enabled at the same time, escpecially

if SIM PIN 1 authentication is done automatically and the setting 

 

≠ 0 is stored to the user profile with

- Until the bit rate is found, URCs generated after restart will be output at 115200 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 

).