Centrica Modbus TCP Panduan Pemrogram - Halaman 8
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Halaman CetakSensor Readings
As seen in Figure 2 above, each sensor slot contains sensor data. This section will review and
explain the sensor data stored for each slot.
As seen in the image, each sensor slot reserve 40 bytes of memory and store the following values:
•
Status – Indicating the status of the reading of the specific slot.
•
Sensor S/N – This is the serial number of the sensor associated with this slot
•
Timestamp – a UNIX Epoch timestamp of the latest message received from the bridge. It is
the number of seconds that have elapsed since 00:00:00 Thursday, 1 January 1970,
Coordinated Universal Time (UTC), minus leap seconds.
•
Current [A] – The calibrated current (in A) measured in the last sensor message received.
•
RSSI – an indication of the RSSI (signal strength) of the last measurement in dBm.
When reading the data, the status register should be analyzed first. Based on its content the other
registers should be processed as shown in the table:
Figure 3 Sensor data storage