Issue 4.5 August 2005 Nodes 5-37
햽
External BNC Antenna This antenna should be connected to the BNC connector for optimum performance.
햾
On-board antenna link When the jumper is across this link, as illustrated, the on-board 1/4 wave whip
antenna is utilised. On the BNC external antenna node, this jumper should be removed.
햿
Power supply and current consumption Current Consumption - Quiescent State: 100mA, Maximum:
200mA.
헀
Ringnet communications Nodes should be wired in a ring configuration, as illustrated. The maximum
permissible distance between nodes is 1Km (using Belden 9829). The interface uses RS485 in a ring topology. The
main controller therefore has two RS485 ports and completes the ring connection – see the following connection
diagram and cable type table.
Node Cabinet
This node has the same cabinet as the 8 Input/Output Node – see “Node Cabinet” on page 5-17 for details.
Additional Information
Method For Optimising RPA Performance
● Fit an external antenna onto the HUA node if not already fitted.
● Move the HUA node to a location where the signal strength is maximised as described in the following RPA
installation test procedure.
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
I1
COM
I2
2K2
2K2
2K2
2K2
cable type
maximum distance
between nodes
Belden 9502 (screened) 500m
UTP Category: 5 (solid core) 1000m
Belden 9829 1000m
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