====== Connecting AirPoint - M (metering) to WebHMI ======

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 |}}





===== Connection method =====
The module connects to a meter with edge connector right to the extension module slot.

{{ ::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"     |

=== Connection with Sontex SuperCalc531 ===

The AirPoint - M can be connected to the heatmeter w/o extra communication module.

{{ ::7bit:sontex-supercalc-531-rev1.png?direct&600 |}}

=== Connection with PolluTherm X ===

The AirPoint - M can be connected to the heatmeter w/o extra communication module.

{{ :7bit:sensus-pollutherm_-_rev1.png?direct&600 |}}