ASL INTERCOM BPC65 Product Manual page 17

Router contacts 1 to
10 on VAR4/12/20 use
a non-isolated
analogue interface
and operate in two
modes:
Router contacts 11 to 62 on VAR4/12/20 and
contacts 1 to 20 on VAR8 and VAR8-ACU use an
opto-isolated interface.
A simple contact closure to a local or remote
ground may be connected as shown.
Configure the required contact as 'External Fault'.
If an analogue contact input of a VAR4/12/20 is used, then configure the surveillance mode as
required.
VAR4/12/20 Menu: Configuration System Router Control Contacts <Contact #
Possible values:
System default configuration: 'Not surv
BPC65 / BDIST / MDIST – Product Manual
•
'unmonitored': It may
be used to interface a
simple contact closure
to ground.
•
'monitored': It may be
used to interface
resistively monitored
contacts. The contacts
must be fitted with
6k8/470R resistors.
'Not Surv' (unmonitored)
'Surv' (monitored
U-0456-0143.doc – Issue: 03 complete, approved
Cabling to Contact
470 ohms
Monitored
Contact
6k8 ohms
12-40 V
VAR4/12/20 CONTACT INPUT 11- 62
VAR8/VAR8-ACU/DAU CONTACT INPUT 1-20
CONTACT
CLOSURE
TO GROUND
Page 17 of 32
THRESHOLD= 2.5V
VAR4/12/20
ANALOGUE
CONTACT
INPUT 1 - 10
0V
VAR4/12/20
ANALOGUE
CONTACT
INPUT 1 - 10
0 V
Cabling to Contact
+
I
-
OPTO ON
WHEN CONTACT
CLOSED
nn
> Not Surv
+5V
4k7 ohms
+5 V
4k7 ohms