8.4.2 Operating frequencies
The modem applied is a quad-band-modem and able to work nearly
worldwide (not South-Korea and Japan). The main operating frequencies
are fixed by the firmware of the modem and depend on the area of
operation. They are GSM 900 and DCS 1800 (Europe) or GSM 850 and
PCS 1900 (USA, South America).
8.4.3 International roaming
The modem is able to carry out ‘International Roaming’ (within the
available programmed frequency band). Due to the possibly arising high
connection and operating cost this function may be deactivated by
default. In general this function is activated.
8.4.4 Operation
After POWER ON of the
2240 PROcheck
monitor the modem attempts
to set up a permanent connection to the www.ppm-log.com website.
After the stabilization phase of the sensor temperature a message is
displayed informing the user about the network strength (if network is
available). If network is not available or network strength is too weak, an
error message will be displayed.
In case of a bad connection the modem permanently attempts to set up a
new connection (independent of the normal measurement operation of
the
2240 PROcheck
monitor).
The data transfer volume depends on the preset time interval for the
mean values. If 30-minute mean values are chosen, the data transfer
volume lies below 5 MB per month, even if the monitor is operated
continuously at 24/7.
During operation the network power is periodically displayed on the
right, top of the display instead of the time.
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