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GPRS Modes
7.2 Behaviour for the GPRS dial-in
Page 44 of 63
Provided that the parameterisation is correct, normally the device dials into
the GPRS network automatically and then sets up the IP server, so long as
GPRS mode is activated in class 82.
For example, faults in the GSM network or at the GPRS provider can cause
the log-in and dial-in attempts of the ZDUE-GPRS-PLUS-VI to fail. To
prevent the device from trying to establish a connection to the GPRS
network continuously (and in some cases incurring costs in the process), the
ZDUE-GPRS-PLUS-VI possesses two timers and a counter that can be
used to control its behaviour in the event of such faults. These parameters
are contained in parameter class 82 (see 7.4.3):
Counter:
Number of dialling attempts to GPRS service before module
reset
Timer 1:
Connection timeout for a failed GPRS login attempt
Timer 2:
Waiting time after x failed GPRS login attempts
Here the ZDUE-GPRS-PLUS-VI proceeds in two steps. If a GPRS login
attempt fails, the number of login attempts defined in Counter are repeated
at certain intervals (Timer 1), until Timer 2 elapses, after which the device
carries out a module reset and the login process starts again from the
beginning.
Device start
Switch off GSM module
Switch on GSM module
GPRS dial-in attempt
Was the GPRS
dial-in successful?
no
yes
Operation
Wait (Timer 2)
yes
Has the max. no. of
attempts (counter) been
reached?
no
Wait (Timer 1)
ZDUE-GPRS-PLUS-VI
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