Siemens M1 manual ATBn Select GSM module’s operating mode, Atb, ATB99

Technical reference section

Example:

Your PC is set to 19200 baud, i.e. higher than the maximum GSM transfer rate of 9600 bit/s. This means that the GSM module receives more data from the PC than it can transfer to the GSM network. In order to prevent a data overflow, the module must be able to interrupt the data flow from the PC. This is accomplished by means of the RTS/ CTS hardware data flow control.

ATBn - Select GSM module’s operating mode

The ATBn command also allows you to set the GSM module’s operating mode perma- nently for all connections.

ATBn			[n=7,11,13,25,27,29,70,99]
			Result
Option	Bit/s	Synchronism	Distant station
ATB99			Automatically sets the mode to match
			the baud rate set for the PC.
			Factory configuration
ATB 7	2400	Asynchronous	V.22bis
ATB11	4800	Asynchronous	V.32
ATB13	9600	Asynchronous	V.32
ATB25	2400	Asynchronous	V.110 ISDN
ATB27	4800	Asynchronous	V.110 ISDN
ATB29	9600	Asynchronous	V.110 ISDN
ATB70	9600	Asynchronous	Fax Group 3
Example:
Enter:		ATB13
GSM module:		Permanently switches the mode to 9600 bit/s with the result that
		all radio connections are permanently set to a transfer rate of
		9600 bit/s.
Enter:		ATB99
GSM module		Automatically changes to the rate of the COM interface.

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