Issue 4.5 August 2005 Nodes 5-5
NODE FUNCTIONALITY
The following features are common to all nodes:
● Ringnet Communications
● Infrared Communication
● On-Board Memory
● On-Board Buzzer
● Tam p er Sw it ches
Ringnet Communications
Europlex nodes are connected to each other via a two
wire RS485 network called the ringnet. It is wired in a
ring, starting from the 3GS controller to the first node,
and any subsequent nodes and, finally, from the last
node back to the controller. All nodes connect to the
ringnet in the same way and the same cabling conditions
apply. The maximum distance allowed from controller to
node is 500m if using Belden 9502 cable. A distance of
1000m is possible using UTP Category 5 solid core or
Belden 9829. The ringnet interface baud rate is 307KB.
Input/Output Functions
Each node has some input/output capabilities,
depending on the node. For the inputs to function as
3GS alarm zones, two 2K2 (US:1k and 470) end-of-line
resistors must be connected. The controller then
determines the zone status by reading the end-of-line
resistance value, according to the following table:
The outputs are 1Amp Form-C dry contact relay outputs.
These relays can be used to drive external devices, such
as a siren.
Infrared Communication
All nodes (except the RKD) are fitted with infrared
transmit and receive capability. This allows you to use the
3GS Hand Held Terminal (HHT) to program or
interrogate the system without having to make physical
connections, open boxes, and so on. You can
communicate with the system by simply switching on the
HHT and pointing it at the nearest node.
HHT gives access to node setup and status information,
such as:
● Serial number
● Software version fitted
● Actual voltage and current used
● Ringnet communications status
● Status of inputs and their resistance values
● Status of outputs
On-Board Memory
All nodes have on-board memory. This is used for storing
data, allowing you to program the system. Programming
can be done using:
● the RKD
● the HHT IR Link
● a local or remote PC
See 3GS Programming for further information.
On-Board Buzzer
Each node has its own piezo buzzer fitted, to allow you
to locate the node (for service and so on). You simply
have to locate the nearest node and request the missing
node to sound its buzzer, thereby highlighting its location
(for example, above false ceilings). You activate the
buzzer using the Node Find option. See Node Configure-
>Information in 3GS Programming for further
information.
In addition, you can assign each node a text description
to help you locate it more easily.
Tamper Switches
All nodes monitor for front and back tampers. Some have
on-board tamper switches and some have terminals
supplied, depending on the cabinet. Most nodes allow
for bypassing tampers using on-board tamper links.
Note The link must be removed to enable
tamper monitoring.
cable type
maximum
distance between
nodes
Belden 9502 (screened) 500m
UTP Category: 5 (solid core) 1000m
Belden 9829 1000m
description value zone status
OPEN 4400 Zone open
CLOSED 2200 Zone closed
DISCON 30 000 Zone disconnected
SHORT < 1400 Zone shorted
DC SUBS Variable DC Voltage substitution
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