Natcomm
Page 5
INSTALLATION
Switches connect to the MULTIPLE INPUT UNIT via a female DB25
connector.
A separate male DB25 connector, with exposed terminals is supplied with
to allow direct solder connection of cables leading to each Switch.
Each Switch has been allocated two specific pin positions on the DB25
connector as per the diagram and table on page 7.
MIU output 12V on the lower rows of pins, which are pins 14-25 (see P 6).
MIU is activated by the detection of 12V on pins 2 – 13, which results from
a remote (normally open) switch closure.
The remote switch must close for a minimum of 100mS to cause MIU to
respond.
Switches can be located up to 100m from the
MIU
unit, or greater than
100m from the
MIU
if low resistance wiring is used.
Communication
: Between the
MIU
and
TDU
is achieved via a standard
6 Wire telephone cable. A short 6 Wire telephone cable is supplied with
the
MIU
, to allow for connection to
TDU
. This cable can be substituted if
necessary with any 6 Wire cable with a length up to 100m. Cat5 cable is
ideal.
Power:
For
MIU
is supplied from the
TDU
via the same 6 Wire cable.
Note: a separate power input jack has been fitted to
MIU
to allow for
operation at distances greater than 100 meters from
TDU
. You can
connect 12VAC or 12VDC input (minimum 300mA, polarity independent)
to this jack if necessary.
