Omega Vehicle Security 1500 Manuel D’Utilisation

7-16

NetScan User’s Manual

The high-current digital-output CSN/Relay Card allows you to add relay functions to the first 16 digital outputs.  The
CSN/Relay card installs into NetScan’s slot 1 (bottom card slot).  Only one relay card can be used per NetScan unit,
and a relay card can not be installed in a NetScan expansion chassis.

The CSN/Relay Card uses 16 dual-coil latch relays and associated circuitry to minimize load on NetScan’s internal
power supply.  Note that the relays are contained in two groups, with 8 relays per group.  Current is briefly drawn
following a change in digital logic output level.  In event of a power failure, it is possible for a relay to remain in a
“set” state until power is restored.

&$87,21

There is a common feed to all 8 relays in each of the two groups.  It is important to stay within the group total current
limitation, regardless of the current ratings of the relay contacts or the plug-in terminal blocks; otherwise the circuit
board may be damaged.  Note that ratings of relay contacts exceed the current carrying capacity of the printed circuit
board.

When the Alarm/Relay Card option is used, it is not possible to install more than 7 signal conditioning cards (3 in the
main unit), since the relay card occupies one card slot.  This means you can have no more than 112 channels instead
of 128, when using this option.

The relay output card option, if used, must be inserted into slot 1 (the bottom slot) of the main NetScan unit.
The channel assignments are then automatically bumped as shown in the following table.

NetScan

-------------

1 - 16

17-32

33-48

Expansion Chassis

(option)

48-64

65 - 80

81 - 96

97-112

&$87,21