![background image](http://html1.mh-extra.com/html/karel/gt20/gt20_technical-reference-and-users-manual_3490508011.webp)
TECHNICAL REFERENCE AND USER’S GUIDE
REV A
GSM GATEWAY
13
14
PLACING THE SIM CARDS
There is a SIM card slot on GT20 for each GSM module. The SIM cards are attached
to these special slots. The illustration below shows locations of the SIM card slots and
placement of the cards to these slots.
Figure-12
Pressing the button shown as
“A”
, the SIM cover shown as
“B”
is removed. The SIM card
is placed properly on the panel shown as
“C”
. The cover
“B”
is pushed in place to finalize
the installation.
If the mains voltage is not constant and voltage variations are in a wide range, then a
voltage regulator between mains output and the Power Adaptor should be introduced
in order to maintain normal operation. There is a fuse of T - Type 250 V / 630 mA at the
alternative current input of the power supply. (T 630 mA L 250V).
Figure-11