Optex RN4-10-25. ChA, RN4-10-25. ChB, RN4-25-75. ChA, RN4-25-75. ChB, RN4-75-150. ChA Installation

REDNET

®

INFRARED BEAM SET TYPE RN4/10-25, RN4/25-75 & RN4/75-150

INSTALLATION AND SET UP INSTRUCTIONS

DESCRIPTION

REDNET® is an extemal beam system that may be used for outdoor ranges between 10 and 150 metres.
The electronics for the beams are supplied with 4 transmitter and 4 receiver heads pre-wired to their
respective electronic control modules. The electronics can then be mounted into either free standing or wall
mounted tower enclosures.

OPERATION

The operating system for the beams uses sequential transmission starting from the top (A Head) and
sequencing down to the bottom (D Head). Synchronisation is achieved electronically eliminating the need for
synchronising cables between transmitters and receivers. All receiving heads will be in the field of view of all
transmitting heads and vice versa creating 16 beam paths.

Beam sets are normally supplied pre-set to code channel number “A” and cannot be changed in the field.
Other channels can be supplied to special order, but, are only used in exceptional circumstances.

Beam heads have integral heating elements to direct warm air onto the tower front covers to prevent the
build up of frost. The heaters are powered via a thermostatic switch (supplied with beam sets) this switches
when the temperature drops to below 15 degrees C.

The system provides three alarm responses as follows:

1) FAST RESPONSE of 40mSec, if two adjacent heads are blocked simultaneously.

2) SLOW RESPONSE, adjustable between 120mSec and 1500mSec if any one beam head is blocked.

3) NO RESPONSE if ANY ONE head is blocked (switch selectable).

A FAST RESPONSE is initiated only when the network is blocked by an object bigger than the distance
between adjacent beam heads. (See Fig. 6)

OUTPUTS

Alarm and fog outputs are via a changeover (Form C) contact. To avoid spurious operation, the fog detection
circuit output is delayed by 10 seconds. To cater for all security requirements the fog detection output is
adjustable.

MOUNTING

Beam sets can be mounted onto the beam head brackets inside the free standing or wall mountable towers.
These brackets are pre-fitted to the towers and may be adjusted vertically as required. The control modules
may be fitted close to the base with the 4 heads stacked above, or, alternatively fitted between the lower two
heads using the locking clips provided. (See Fig. 1A, 1B)

A tamper switch (supplied with each tower) operates when the top cover of the tower is removed. Free

standing towers can be fitted with an anti-climb top tamper system type RNTT, to detect attempts to climb

over the tower.

Wall mount towers must be fixed to a stable surface, such as brick, by means of suitable wall fixings.

WARNING: ensure that tower extrusion is not bent by bumps in the wall surface, use spacers if required. A

pole mount kit RNPK (accessory) may be used for fixing to scaffold poles.

Whenever possible, use the rear hole for cable access. If the bottom end cap (with the drain holes) is to be

used for cable entry, remove from tower before drilling.

Remove the control electronics covers, keeping the two screws safe and fit to the tower extrusion using

the swivel locking clips. The unit may be located either between heads ‘C’ and ‘D’ or close to the bottom

of the tower with the heads stacked above. The choice will depend upon the type and flatness of the

ground surface. To avoid confusion when setting or re-alignment, it is recommended that both receiver and

transmitter heads are fitted with ‘A’ at the top and ‘B’ - ‘D’ below. The signals received by head ‘D’ are used

for fog detection and must be nearest the ground.

Ensure that all the transmitter and receiver heads are within sight of each other and that the bottom ‘D’ heads

are not obscured by rising ground, see Fig. 1B. Locate the head cables into the cut-outs on the brackets, run

any other cables behind the brackets.

When planning the system layout, ensure that the receiver heads only see their respective transmitters.

Figures 1-4 illustrate preferred layouts. It is strongly recommended that towers contain either all

transmitters or all receivers as shown.

ELECTRICAL CONNECTIONS

Terminal connections are shown on the controller covers. The transmitter has 3 terminals.

H: 12VDC nominal heater supply via thermostat

The receiver has 10 terminals, two heater terminals located towards the top of the circuit board. The other 8

terminals are split for the fog and alarm relay and power. See Fig. 5 for connection. With heaters operating,

each tower will require a total of typically 450mA. (Assume 0.5 Amp. for cable voltage drop calculations.)

+: 12VDC nominal transmitter supply

- : Common ground both supply

INSTALLATION

The towers must be mounted firmly. Free-standing towers should be bolted to a solid surface using the

expansion bolts provided. When the free-standing towers are to be fitted into soft earth, it is essential to

provide a concrete pad. Anchor plate, type RNBB (accessory) may be cast into wet concrete to provide 4

projecting studs to which the tower base may be firmly bolted.

A

B

C

D

A

B

C

CONTROLLER

D

A

B

C

D

A

B

C

D

Fig. 1A

Fig. 1B

PERIMETER

(TOWERS)

Fig. 3

LINEAR OR PATH

Fig. 2

PERIMETER

(WALL-MOUNT)

Fig. 4