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2. Design and function
The transmission of the measured pressure values to an IIoT platform is carried out at a preset sending interval. The
measurement and sending intervals, and also the alarm limits, for particular measured values can be configured over
the IIoT platform.
Using a mobile device with a local interface via Bluetooth
battery life, etc.) can also be queried on-site and the instrument can also be configured.
An update of the measured value only occurs in line with the set measuring rate! Until the next
measurement, the sensor transmits the last valid measured value.
2.3 Functional principle (model PEW-1000)
The model PEW-1000 uses the LoRaWAN
The last registered measured value is, optionally, transmitted via Bluetooth
an advertising interval of 1.25 s. The measuring rate can be defined independently of the transmission rate. The
model PEW-1200 can be configured such that, on triggering of an alarm, the measuring rate is changed, 4.5 "Alarm
description".
→ For details on the Bluetooth
documentation "Special documentation for BLE communication specifications, models PEW-1000 and PEW-1200".
→ For details on the LoRaWAN
→ For details on the LoRaWAN
specifications, model PEW-1000"
Examples for uplink contents:
Measured values
■
Notifications for fault diagnosis
■
Alarm parameters
■
Configuration ID (for the identification of changes in the measuring and sending rate)
■
Battery charge status in V
■
Example for downlink contents:
Configuration change (e.g. measuring rate, sending rate, alarm parameter etc.), which can be recognised by the system.
WIKA operating instructions, models PEW-1000 and PEW-1200
®
class A radio standard, which is designed for energy-saving operation.
®
connection, see chapter 3.8.2 "Bluetooth
®
, see: https://lora-alliance.org
®
communication protocol, see "Special documentation for LoRaWAN
®
Low Energy, the instrument status (current measured value,
®
in "periodic advertising mode" at
®
Low Energy" and the additional
EN
®
communication
5
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