4
1.2 Differences between the 2G, 3G and 3GA models
The only difference between the
2G
and
3G
models is the type of the modem used.
The 3G (UMTS) communication makes possible higher speed, thereby increasing the speed of
reporting. The
2G
and
3G
models can be used in Europe, while the
3GA
model is equipped with
a pentaband UMTS/HSPA modem that can be used worldwide. There is no difference between
the mentioned models with regard to the available functions or configuration.
For the
2G
model, calls made through the GSM network will delay all other communication,
since 2G modems are unable to use multiple communication channels simultaneously.
1.3 Differences between the IN4.R2 and the IN6.R1 models
The
IN4.R2
model comes with 4 contact inputs (IN1 to IN4) and 2 relay outputs (OUT1, OUT2),
while the
IN6.R1
has 6 contact inputs (IN1 to IN6) and 1 relay output (OUT1).
2 Connecting the terminals and putting into operation
Attention! Do NOT connect the metallic parts of the GSM antenna connector or the
terminals of the device directly or indirectly to the protective ground, because this may
damage the device!
2.1 Under Voltage Lock Out (UVLO) function
The product is provided with built-in automatic power disconnection (Under Voltage
Lock Out) function. Depending on the product type, if the supply voltage drops below
8.4…8.2V, the device turns off automatically and it turns back on when the supply
voltage is at least 11.2…11.4V.
The minimum supply voltage level required to turn the device
on is 11.2…11.4V!
After turned on with supply voltage hig
her than 11.2…11.4V, the device can operate
stably even at lower supply voltage, but not lower than 8.4…8.2V.
If the device is powered from a power supply provided with a backup battery and there is no
other electrical load on the battery when charging fails (e.g. in case of a power cut), while the
battery discharges, the device
turns off automatically at 8.4…8.2V voltage level.
Thereafter, if the battery is in good condition, it can regenerate and can reach the terminal
voltage of 11.2…11.4V where the device turns back on, then the battery may discharge again
below 8.4…8.2V. This may result a continuous switching on and off cycle that lasts until the
battery can no longer regenerate to the 11.2…11.4V voltage level. If this phenomenon occurs,
the battery is flat and it should be replaced.
