DigiLink US DC Version
DIGUSDC 02/00
Issue
3
8
Section 2: System Operation
Confirmation of power connection is by way of the red LED on the front fascia. This will remain off
until a zone is triggered. It will then blink continuously, except during transmission repeat periods or
when the power source falls below 10.5V dc, when it will remain off.
Confirmation of transmit is by way of the momentary green LED on the front fascia. This will light for
approximately 1 second each time a transmission occurs.
When any zone is changed to it’s active state, the pre-programmed message for that zone will be
transmitted to the pager(s). Repeat transmissions can be programmed for added security, these will
be detailed on the Configuration Data sheets provided with your system.
Where the system has been configured for voltage input:
volts present = an open input, no volts = a closed input.
The siren output is an “open collector” type switching to ground. It may be used to switch up to 24V dc
@ 1A max. Note that if it is used to switch a relay, a suitable diode must be connected across the
relay coil (stripe towards positive side of coil). If using a battery to power the unit, it should also be
noted that use of a siren will severely shorten the battery life.
Problems and Fault Finding.
1
Check that the input cables are connected to the active zones. For a 4 zone unit,
these are the lowermost terminal blocks on the main PCB (see diagram page 9).
2
Check the Configuration Data sheet supplied with the system to confirm the active
(trigger) state of each input i.e. Normally Open, Normally Closed or Change of State.
3
If your system has been configured for Dry Contact operation, ensure that no voltage
is present on the input cables. Also check that cable runs are not excessive
(preferably less than 10 meters) and are not in close proximity to other mains or
telecoms cabling.
4
Check that the pagers are at least 3 meters from the transmitter and aerial.
Under certain conditions it is possible to flood the pager receivers and corrupt the
data
received.
5
Check that the pagers have the battery installed with the correct polarity and are
correctly powered up.
6
Check that the power source is the correct type (12 to 13.8V dc) and correctly wired
to the terminals provided (see diagram page 9). After triggering any zone, the red
LED should blink to indicate that the system is running.
7
Check that the green LED lights for the duration of the transmission. If not, go back
to the cabling and re-check the terminal connections.
8
Check that the aerial is correctly installed.
