6
User manual
GSM LT-2
Figure 3. Entering the SIM card into its socket
.
It is suggested that the power supply be located within 3 m from the module.
If the supply voltage is lower than 9.8 V, restart of the module will follow. Therefore, be
careful that the module supply voltage never drops during operation below 9.8 V at the
maximum current consumption.
6. O
PERATION OF THE MODULE WITH ALARM CONTROL PANEL AND STATIONARY
TELEPHONE
As shown in Figure 1, the module is to be directly connected to the control panel’s public
telephone line terminals.
It maintains impedance and voltage across the R-1 and T-1 terminals as necessary for
correct operation of the telephone set. The terminals can be automatically deenergized in
case of a loss of communication with the base station (which is accompanied by operation of
the FLT trouble indicator – see: programming function No. 17).
When the control panel goes "off-hook", or when a user lifts the handset of a telephone
connected to the terminals T-1 and R-1, the module will generate the continuous dialing tone
and receive the tone or pulse dialing signals (similarly as the telephone exchange).
The telephone number can include digits and special characters:
#
,
*
,
+
. The phone number
should be dialed just like from a cellular phone, as required by the operator of the network
into which the telephone is logged. It is recommended that the number begin with the "+"
character and country code prefix (48 for Poland). Sometimes you can dial just the mobile
phone number, or the area code and stationary telephone number.
Examples:
[*][0][4][8][5][0][1][1][2][3][4][5][6] – connection to mobile phone (with prefix "+48")
[5][0][1][1][2][3][4][5][6] –
connection
to
mobile phone (number without prefix)
[5][8] [1][2][3][4][5][6][7]
– connection to stationary telephone, (in this example, 58
is location area code)
If the first four digits of the dialed number correspond to the pre-programmed "
pager station
number
", the module goes to the procedure of receiving the alphanumeric message and
sending it as an
SMS text message
(see section
Sending SMS messages
). Checking of
the first four digits is always performed.
When connection is established by the cellular telephone, the module will transmit LF audio
signals between the extension line T-1, R-1 terminals and the cellular telephone. After the
handset is lifted by the subscriber the connection is established with, the module changes
1. slide the card
carrier up
3. press the carrier to the
plate and slide the
carrier down to fix it in
position
2. turn the carrier aside and
slide the card into the
guides
SIM card
