ZFR1800 Series Wireless Field Bus System Technical Bulletin 19
• When a wireless mesh network forms, it uses up to five address depths in
assigning addresses for network communication. Refer to Figure 3. For more
information, see Appendix C: Restricted Hallway Scenario.
Note: Sensor devices cannot communicate directly with routers at depth 5. They
must be able to join the mesh at depth 4 or lower. For example, suppose a
WRZ sensor is physically located in the same room as its VMA with
Address K at depth 5. Since Address K cannot support any sensors directly,
the sensor must be within range of Device J at depth 4 and send its data to
Device J, which then forwards it to Address K.
Note: When a router joins the mesh, it does so based on the availability and signal
quality of other devices around it at that point in time. For example,
although Device L is physically located in the proximity of Device H, it
may get its address from Device J when it joins, making it a depth 5 device
and effectively limiting the growth of the mesh from that point.
Table 3 shows recommended and maximum indoor transmission ranges between
ZFR1800 Series products.
Indoor line-of-sight transmission ranges between products can be less than shown
in Table 3. The effective transmission distances and signal quality can vary per
application because of wireless signal absorption and reflection due to metal
obstructions, walls, ceilings, floors, and furniture found in typical building
interiors.
Note: Use the optional, battery-operated WRZ-SST-120 Wireless Sensing System
Tool with any model WRZ Series Sensor as a site survey tool to determine
the wireless signal strength between potential locations of ZFR1800 system
devices to survey your application and adjust ZFR1800 device locations
before permanently installing the devices. Refer to the WRZ-SST-120
Wireless Sensing System Tool Installation Instructions (Part No. 24-10563-
12) for more information on the tool.
Table 3: Indoor Transmission Ranges
Range Type Transmission Distance
ZFR1810 Coordinator,
ZFR1811 Router/Repeater
WRZ Series Sensor
Recommended 15.2 m (50 ft) 15.2 m (50 ft)
Maximum, Line of Sight 76.2 m (250 ft) 30 m (100 ft)
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