Outputs
The AlphaVision NG control panel is supplied with 9 outputs. One of these outputs (AL1) is a potential free
relay contact (max. 30VDC/750mA), seven of the outputs (AL2 to AL8) are Open Collector (OC, transistor)
and one output is a speaker output (LS).
Relay output
The common contact of the relay is supplied with a self-recovering fuse (F6, 750mA).
Open Collector output
The 7 open collector outputs can supply max. 100mA each (and no more than 500mA in total). The open
collector outputs can be seen as transistor switches, with the output being switched to the 0V when activated.
In the deactivated state the output is high-ohm.
When the OC output controls a LED, a current-limiting resistor should be placed series with the LED. The
cathode side of the LED is connected to the OC output and the anode side with a series resistor of e.g. 1k2 to
the +12V.
An Open Collector output can also be used to control a relay. Make sure that the maximal coil current does
not exceed 100mA. One side of the relay coil is connected to the OC output and the other side is connected
to the +12V output. We recommend placing a 1N4001 diode in reverse direction over the relay coil contacts.
This means that the cathode side (negative) of the diode is connected to the +12V and the anode side
(positive) is connected to the OC side. The best result is achieved when the diode is soldered over the
clamps of the relay.
Speaker output
The speaker output (LS) can be used to connect an indoor speaker with a 4-16 Ohms impedance. An indoor
speaker has the advantage that there are separate signals for fire (slow whoop) alarms and burglary alarms. It
is possible to connect up to two 8-ohm speakers in a parallel connection onto the LS output.
For output connections of the AlphaVision NG see figure 1.
Integrated PSTN dialler
The AlphaVision NG control panel is supplied with an integrated analogue PSTN dialler. This analogue
dialler has its own priority switch. Connect the incoming telephone line to the Av and Bv clamps. Connect
the other telephone sets to the A’ and B’ clamps, which can be found next to the Av and Bv clamps. The A’
and B’ clamps are connected to the priority switch. In this way the control panel will always have a
telephone line to send its reports.
The analogue dialler of the AlphaVision NG control panel is galvanic separated from the telephone net
through opto-couplers. Because there is no PTT transformer on the circuit board any more, it is not possible
to use a conventional audio amplifier. To solve this, Alphatronics developed a special audio amplifier for the
AlphaVision NG control panel. On the AlphaVision NG circuit board a 3-pins header is placed (JP7), onto
which the AlphaVision NG audio amplifier can be connected. This audio amplifier gets its power supply
from the circuit board.
RS-485 bus
The AlphaVision NG control panel uses a standard industrial RS-485 bus for connecting the external
AlphaVision NG components, such as keypads, expansion modules, printer modules, etc., to the control
panel. The RS-485 bus is a 4 wires bus consisting of two wires for the +12V and 0V and two wires for the
data communication, which are marked as A and B. When connecting the other components, it is of great
importance that all components are connected one on one, so A to A and B to B. The standard industrial
RS-485 bus makes data transmission up to 1200 meters possible. This distance can only be achieved when
the following conditions are met:
AlphaVision NG installation manual Rev. 2.0 27-08-2003 Blz. 9/101
