In the basement of a building, there are power cabinets that provide power to drive motors for pumping water, waste water, fire sprinkler, fan control, etc. In order to monitor the voltage, current, power and energy for each power panel, PEM-1000-LR (LoRa) are used to monitor each equipment. Using LoRa based devices have the advantage of not drilling holes in the walls, provide longer distance to LoRa gateway. Installation is much more convient than the wired technology, i.e., RS-485.

PEM-1000 LoRa signal consists of  sensor device name (PEM), ID number (R1 ~ Ri), Sequence number, each measured item name (Voltage, current, power, frequency, energy) and the associated data consecutively in JSON format. LoRa signals from each PEM-1000 are transmitted to the LoRa Gateway (LRMQ-1000).

LRMQ-1000 encapsulates the received LoRa signal into MQTT format with a predefined Topic and then retransmit the MQTT signal to the MQTT server (MQSVR) using 2.4 GHz WiFi for further processing.

MQTT Server parses each received MQTT messages into voltage, current, power, frequency and energy values for each individual PEM-1000 device. The processed values can be displayed in the remote PC monitor as shown in the figures.