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--- ap-metering [2022/05/10 08:58] – [Features] emozolyak
+++ ap-metering [2022/11/07 11:05] – [M-bus protocol] emozolyak
@@ Line 3: / Line 3: @@
 This version of the AirPoint module is intended for reading data from heat meters via the M-bus protocol and transmitting telemetry data via the MQTT protocol to data collection systems.
+{{ :conn:conn-examples:ap-m-app-structure2.png?direct&600 |}}
 ===== Features =====
   *Compatible meters: DIEHL Scylar INT, Siemens FUE950, Danfoss Infocal, and their equivalents
   *Connection using a standard connector (included with the module) instead of the communication board of the heat meter
   *Energy saving polling cycle
+{{ :conn:conn-examples:scylar-picutre.png?direct&350 |}}
@@ Line 15: / Line 19: @@
 {{ ::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         |   m3  | "counter_in2" |
+|Q        | Flow  |  m3/hour   | "hum_int"     |