Siemens M1 - Manual (Page 22)

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GSM M1 Module, English: A24859-N4000-A100-1-7677 gsm-m1-e.fm
Technical reference section
6.3.96
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.
The ATBn command also allows you to set the GSM module’s operating mode perma-
nently for all connections.
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.
ATBn - Select GSM module’s operating mode
ATBn [n=7,11,13,25,27,29,70,99]
Option
Result
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