PAGE 28 of 32 DIGITAL GSM INTERCOM TECHNICAL MANUAL VER2.1.1
CHECKING THE BALANCE (BAL)
*Note: The balance can only be checked if the correct balance check string has previously been
stored using the SDL code explained earlier in the manual.
The intercom also has the facility to monitor the available credit and then text you to inform you
when it has fell below £5.00, €5.00 or $5.00. It will then remind you with another text after every 20
calls until the credit is either increased or it runs out. To use this feature, the following settings
must first be made:-
o You must be using a Pay AS You GO SIM card from a provider that offers this service (Vodafone, O
2
)
o The correct balance check string must be stored using the SDL code.
o A mobile phone number in which to receive the balance low text must be stored in the telephone
number field of memory location 999.
UNDERSTANDING THE SIGNAL STRENGTH (SIG)
When a request for signal strength message is sent to the intercom panel it will reply with a two
digit signal strength code. The code will be between 0 – 31 or 99. Ideally the signal strength should
be as close to 31 as possible. The lower the number, the weaker the signal. Signal strengths lower
than 10 may cause operational problems such as loss of speech quality (and possibly missing
DTMF tones) and network loss. A signal strength of 99 indicates it could not be detected.
DIALLING INTO THE INTERCOM FROM ANOTHER TELEPHONE
There are three possible outcomes to dialling into the GSM intercom depending on the
telephone number you are dialling in from and the features setup during programming. The
three possible outcomes are shown in the table below and are shown in order of priority
(For example, if the number is programmed to automatically activate the relay, this will
take priority over the following two options and if the telephone number is stored as a
telephone number called from one of the push buttons, this will take priority over the last
option.
FUNCTION
REQUIREMENT
PRIORITY
Dial in to open the door.
After dialling the number, the relay will
activate and the call will be dropped.
The telephone number of the telephone
dialling in must be stored in memory and the
DTO flag set to 1.
1st
Dial in to activate a call (Live speech,
activate relay/AUXO)
After dialling the number, the call will
be answered and two beeps will be
heard. The speech will then be live.
The telephone number of the telephone
dialling in must be stored in memory.
2nd
Dial in from a number not stored in the
panel. The call will be dropped.
If neither of the two requirements above are
met.
3rd
RECORD SHEET
INTERCOM PANEL TELEPHONE No.
IMEI NUMBER
MASTER CODE
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