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TI 01W06A51-50EN
Mar.26,2019-00
6.
Operation and Maintenance
This chapter describes how to carry out daily check of the Sushi Sensor system, carry out
maintenance when a warning or error occurs, and add and replace wireless system components.
6.1
Daily Check
To ensure that the wireless communication system continues to operate correctly, it is important
to monitor the communication stability even after the setup work has been completed and the
system has started to operate normally. Wireless communication may become unstable if radio
waves are affected by obstacles in the communication path. Extra attention must be paid when
a new building is constructed, additional equipment is installed, a temporary structure is built for
installation or maintenance purposes, or a crane or other heavy vehicle enters the site
6.1.1
Checking Wireless Communication Status
The application enables you to check the received signal strength indication (RSSI) and the
packet error rate (PER) of Sushi Sensors. Based on these values, you can check the wireless
communication status.
You can also use the Sushi Sensor configuration tool, “Sushi Sensor App”, to check the RSSI
value. For details, refer to the Sushi Sensor user’s manual.
6.1.2
Gateway Inspection
During gateway inspections, check the installation of the gateway as well as its operation as a
Sushi Sensor system component.
Check the installation, communication cable connection, and cleanliness of devices.
If any device is dirty or dusty, wipe off dirt or dust using a soft cloth moistened with water or mild
soap
6.1.3
Handling a Device in a Warning State
If any device has been judged to be in a warning state, a communication error may occur if the
status deteriorates even if the application is currently able to acquire sensor values and status
information.
If a warning message appears due to a low battery level of a Sushi Sensor, replace the battery as
soon as possible regardless of the displayed number of days. For details about the replacement
procedure, refer to the Sushi Sensor user’s manual.
If a warning message appears due to a problem related to Sushi Sensor communication
quality, check whether any phenomena causing a radio propagation failure has occurred in the
communication path. In addition, check whether any additional structures or vehicles are on
the path or around the device, and whether any new wireless communication system using the
same frequency band has begun to be used in the vicinity. For a certain period of time, monitor
the device for which a warning message is displayed due to a problem related to communication
quality. If there are no signs that the device may return to the normal state by itself, adjust the
device arrangement. Adjusting the installation location may cause the device to return to the
normal state. In addition, when another wireless system is used, improvements can be made by
changing the radio frequency.