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4.4.
Switching on the modem
The properly assembled modem is switched on by feeding of electric voltage into the modem
supply terminal block. The green LED diode lights up. The modem will be prepared for
communication after ca. 1 minute from its switching on. It is advisable to check the
communication by sending SMS message
gsmstatus
to the modem phone number. A response
delivery time is generally dependent on a momentary cellular network load and state. If the modem
works correctly, it will send back SMS message with its state information. If you don’t receive the
response to this SMS message, please check your SIM card settings, power supply connection and
aerial connection.
If communication with the modem via cellular network is impossible, you can try to find a
problem with the program for data loggers. In this case, you must interconnect the modem and the
computer via the setting cable, see the chapter
4.5.
Setting up the modem
If you don’t intend to use remote communication with the data logger via GPRS, you can go to the
chapter
Setting of the other parameters
4.5.1.
Setting of GPRS connection parameters
If you didn’t specify the GPRS connection parameters before ordering the modem, you must set it
up now.
To do it, you can send a special SMS message to the modem phone number. The first word of the
message must always be
gprs
. After this keyword, parameter values for an actual setting follows in
specific order (see below):
gprs [apn] [user] [password] [dns]
If the trailing parameter values are not entered, they will be deleted. Don’t enter the square
brackets in the SMS message. Individual items of the message must be separated by spaces. For
more detailed information about setting this parameter values via SMS command see the chapter
Setting of the GPRS connection
The example: You can set up the parameter
apn
to value
internet
without other parameters (
user
,
password
and
dns
) by sending the SMS message
gprs internet
For getting information about GPRS connection parameters please contact an appropriate mobile
operator.
4.5.2.
Setting of M2MTalk client parameters
These parameters are already preset at the factory, don’t change it gratuitously! If you can verify a
setting, compare it with data listed in the card which was delivered with the modem.
M2MTalk client parameters can be set via the SMS command (see the chapter