Distance Between Devices; Ensuring Line Of Sight; Wdr Installation Position And Obstacles; About The Signal Tower Power Supply Status - Patlite WD PRO Series Instruction Manual

Wireless Data Communication System - WD PRO Series Instruction Manual

6.2.3 Distance Between Devices

Place the WDT within a 20 m radius (recommended line-of-site distance) of the WDR. If more distance is required,
add another WDT.

6.2.4 Ensuring Line of Sight

・Good line of sight for each device (WDR, WDT) and free of any obstacles – hereafter referred to as the Fresnel
Zone – is required. The Fresnel zone is a three-dimensional space, whose size is estimated as shown in the
following illustration.
・If you cannot establish the Fresnel zone, sometimes the available communication distance may be shorter than
usual due to obstacles inhibiting communication.
L
WDT
WDT
When installing on a metal plate or concrete wall, install the devices in the Fresnel zone so they are free of any obstacles.

6.2.5 WDR Installation Position and Obstacles

・When onto a pillar such as the I-beam in a building, install the WDR in a direction that promotes the propagation of
radio waves.
・When using the WDR in a box, use a resin box with radio wave permeability.

6.2.6.About the Signal Tower Power Supply Status

To operate this product, you need to constantly supply power to the power line. For information, refer to "7.1.4 WDB-
DB0S wiring( P.32)".
Fresnel Zone
D
WDR
Figure 1
Obstacles (wall, floor, ceiling, pillar, building)
WDR
Fresnel Zone
Figure 2
L
Line of sight distance
20 m
10 m
CAUTION
22
6. Installation
D
Fresnel zone diameter
1.6 m
1.2 m