BEWATOR COTAG 4101-2, Installation Handbook, Page: 43 / 158

4322 Cotag Reader module
4-5
The cable specification is the same as for the 280 given above.
*
If you are using ordinary screened twisted pair, the screens should
be connected to the Controller case and not to the screen connections
on the module, see the chapter on “Earthing and screening”.
Local warning bleepers
The system can be configured to give a local warning output on the
horn
terminal when a door is forced or is left open for longer than
a specified time. Each local warning output should be fed to a bleeper
mounted near the door, or to the horn which is fitted on the 280 Mk2
Reading Head. For low current devices up to 10mA such as the horn
in the 280 Reading Head, you can draw the power from VA. For more
power, you can connect the sounding device between the auxiliary
12V supply and the local warning output which is an open collector
which can sink up to 250mA at 12V DC. For even more power, use
the local warning output to control a relay switching a separate power
source at the door.
Module Function
Local warning output - open collector - 0V when active
VA +10V (10mA maximum)
Relays (for door lock mechanisms)
The relays each have three terminals: Com (common), NO (normally
open) and NC (normally closed). The relays are electrically isolated
from each other and from everything else. Each relay can be
connected to a power supply of maximum 30V AC or DC passing a
maximum current of 2A.
Module Function
NC Normally closed contact
Com Common
NO Normally open contact
Using a relay to switch inductive DC loads
If you are using a relay to switch an inductive DC load, such as a
mag lock, we recommend that you fit a suppression diode across the
load as shown in the following diagram.
Mag lock
Power supply
NO
NC
Com
- +