Page 4 National Communications
INSTALLATION
COMMUNICATION
Communication between the SPEAKER SWITCHING UNIT (SSU), the
TALKING DISPLAY UNIT (TDU) and the MULTIPLE INPUT UNIT (MIU) is
achieved via a standard 6 wire telephone cable.
A short 6 wire telephone cable is supplied with the SSU and the MIU.
This can be substituted if necessary with any 6 wire cable with a length
up to 100m.
POWER
Power for the SSU and the MIU is supplied from the TALKING DISPLAY
UNIT (TDU) via the same 6 wire cable.
INSTALLATION PROCEDURE
1) Using a 6 wire telephone cable, connect Communications Port 1 of
the SPEAKER SWITCHING UNIT (SSU) to the Sensor Input port of the
TALKING DISPLAY UNIT (TDU).
2) Using another 6 wire telephone cable, connect Communications Port
2 of the SPEAKER SWITCHING UNIT (SSU) to the Communications
Port of the MULTIPLE INPUT UNIT (MIU).
3) Connect a separate 12VAC or 12VDC (minimum of 300mA - polarity
independent) power source to the power adaptor jack of the MULTIPLE
INPUT UNIT (MIU).
This additional power input for the MIU is required to prevent the
possibility of ‘brown out’ when the SPEAKER SWITCHING UNIT and
MULTIPLE INPUT UNIT are used in the same application.
4) Solder the connections for your Speakers to the supplied Male DB25
connector, as per the table on page 6.
A separate male DB25 connector, with exposed terminals is supplied
with this unit to allow direct solder connection of cables leading to each
speaker.
