Telephone line monitoring
The line monitor indicates if the phone line is intact. If broken, after about 35 to 45 seconds,
“LINE FAILURE” is displayed and the line failure status output is activated.
Power supply (battery) monitoring
The power supply input is monitored. If it drops below 85% of the nominal voltage, “LOW
BATTERY” is displayed. Also, the BATTERY status output is activated.
2-Way Voice
This feature requires the installation of the 2 way voice board (optional). It allows the person
who is called to both listen and talk to people near the Informa 300.
After the messages have played, it goes into the 2-Way voice mode. It keeps the line if
speech is detected from either end. It hangs up 20 seconds after speech stops. The 2-way
voice mode only operates for a maximum of 4.25 minutes even if speech is present. This
prevents it from keeping the line forever if there is noise on the line resembling speech, or
if a radio or TV is playing near the Informa 300.
Connections
Telephone line
The connections to the telephone line are made to the terminals marked “TEL” on TB4.
If there are any house phones which use this phone line, they connect to the terminals
identified by the telephone icon. The remaining terminal on TB4, connects to earth ground.
Power
+12 or +6Vdc connects to the + and - terminals (6-12V) on the right hand terminal block.
Standby current is about 15 mA. Backlighting adds about 55 mA. When the system is
operating, the telephone relays are active, the current increases to 85 mA (without
backlighting). When operated from a 12 Vdc power supply, the jumper must be in place
on J3. It must be removed for 6 Vdc operation. This controls the voltage sensing circuitry
which indicates when the battery is low.
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Informa 300 Voice Message Communicator