About this task
You should verify adequate RF signal strength between sensors and receivers, especially in applications with excessive distances or metal barriers, such as ductwork, concrete with metal reinforcements, equipment rooms, or elevator shafts. The RF signal strength in One-to-One wireless sensing system applications can be checked before you set up your system as follows:
- Set the DIP switches on the sensor and receiver (or the wireless sensing system tool) to the same RF address (TRANSMITTER ID and AREA).
Use the battery pack of the FX-WRZSST-120 Wireless Sensing System Tool to provide power to theFX-WRZ7860 Receiver (two-pin connector on the back of the FX-WRZ7860, just below the TRANSMITTER ID DIP switch block). See Figure 5.
Note: The battery pack contains a small power switch.
- Hold the FX-WRZ Series Sensor near its desired mounting location in the zone, with the battery installed and the power switch set to ON.
Observe the RF LED on the receiver. Every 60 seconds, an RF transmission occurs and the LED blinks. You can force the sensor into Rapid Transmit Mode (RTM) by pressing the FX-WRZ Series Sensor’s manual occupancy override button for 5 seconds or more.
In RTM, the sensor transmits a signal every 10 seconds for a period of 5 minutes. After each transmission, the occupancy override LED on the sensor flashes on (one, two, or three times) to indicate the signal strength between the sensor and the receiver. Also, the signal strength LED on the receiver blinks off to indicate the relative signal strength between the sensor and receiver. The LED flashes indicate the following:
- Three consecutive flashes (of the sensor LED) or blinks (of the receiver LED) every 10 seconds indicate an excellent signal strength.
- Two consecutive flashes (of the sensor LED) or blinks (of the receiver LED) every 10 seconds indicate a good signal strength.
- One flash (of the sensor LED) or blink (of the receiver LED) every 10 seconds indicates a weak signal strength. A weak signal strength may result in sporadic loss of data. Therefore, move the sensor and/or receiver mounting locations until the signal strength improves.
You may need to relocate the sensor or receiver to improve the RF signal reception. The FX-WRZ7860 Receiver may be wired (SA Bus) up to 100 ft (30.5 m) from a supported Johnson Controls controller or anFX-ZFR181x-x Repeater can be installed to extend the range between the FX-WRZ sensor and FX-WRZ7660 receiver.
- Check the receiver for adequate RF signal strength after the building occupant moves into the space. Checking a second time ensures that none of the occupant furnishings or equipment interferes with RF signal reception.
See Table 3 for troubleshooting additional problems or symptoms.