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--- ap-metering [2022/05/10 09:00] – [Features] emozolyak
+++ ap-metering [2022/05/10 09:11] – [Features] emozolyak
@@ Line 8: / Line 8: @@
   *Energy saving polling cycle
-{{ :conn:conn-examples:scylar-picutre.png?direct&400 |}}
+{{ :conn:conn-examples:scylar-picutre.png?direct&350 |}}
@@ Line 18: / Line 18: @@
 {{ ::metering_option.jpg?direct&400 |}}
+==== M-bus protocol  ====
+All meters are read with "REQ-UD2" request using broadcast address. The M-bus tags are mapped onto statndard AirPoint's MQTT topics:
+^ Value   ^   Description   ^ Units ^ Mapped to ^
+|FWT      | Forward temp.  |  °C   | "temp_int"    |
+|RET      | Return temp.   |  °C   | "temp_ext"    |
+|E        | Energy         | Gcal  | "counter_in1" |
+|VOL      | Volume  temp.  |   m3  | "counter_in2" |
+|Q        | Forward temp.  |  °C   | "hum_int"     |