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air sns DUCT-M
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The DST air sns DUCT-M is a commercial in-duct air quality monitor.

Specifications
==============

* Power: AC 100-240V to DC 24V power adapter
* Connectivity: WiFi / Modbus via RS-485 / NB-IoT

Measurement Fields
------------------

* PM2.5
* PM10
* TVOC
* HCHO
* CO
* CO2
* NO2
* Temperature
* Relative humidity
* Air pressure
* Light
* Noise

Configuration
=============

To access the configuration page of the monitor, follow the steps below:

#. Power up the monitor
#. Press and hold the "Configuration" button for at least 8 seconds

.. image:: /images/dst/duct_config.png

#. Connect a computer or a smart phone to the wireless hotspot created by the monitor; its SSID (network name) should
   start with *DUCT* or *MXCHIP*
#. On the web browser of your device, type *10.10.10.1* or *10.10.10.1/index.html* in the address bar and enter

   * ``Username``: *admin*
   * ``Password``: *admin*

You may now set up the monitor on the configuration page according to the following instructions:

* To gather the information required for adding the monitor to the gams platform, see
  :ref:`monitors/dst/duct:Monitor Information`
* To connect the monitor to a WiFi network, see :ref:`monitors/dst/duct:WiFi Setup`
* To configure the monitor to send data directly to gams platform through **TCP**, see :ref:`monitors/dst/duct:TCP Setup`
* To configure the monitor to send data directly to gams platform through **MQTT**, see :ref:`monitors/dst/duct:MQTT Setup`

Do not opt to reboot the monitor after you save each change. Only after you've done all the configuration needed:

#. Click ``Module Management`` on the left sidebar menu
#. Under the ``Module Reboot`` section, click on ``OK``

Monitor Information
-------------------

#. Click ``Module Management`` on the left sidebar menu
#. Under the ``Version Information`` section:

   * Its **UUID** is on the ``Device SN`` line

WiFi Setup
----------

#. Click on ``Wifi Mode Select`` on the left sidebar menu
#. Select ``AP and Station`` and click on ``save``
#. Click on ``Station Mode Setting`` on the left sidebar menu
#. Under the ``Station Parameter Setting`` section, click on ``scan`` to select the wireless network you wish to connect
   the monitor to or manually enter the ``SSID``
#. For ``Encryption Mode``:

   * If the WiFi network does not require a password, select *Disable* and click on ``save``
   * If the WiFi network requires a password, select *Enable*, enter the ``Password`` and click on ``save``

TCP Setup
---------

#. Under section ``Uart Parameter Setting``, change ``Baud Rate`` to

   * ``9600`` for **normal DUCT**
   * ``115200`` for **DUCT with O3**

#. Click on ``Network Setting`` on the left sidebar menu
#. Under section ``Network Connection Setting``, change the following options:

   * ``Protocol``: *TCP Client*
   * ``Remote Port``: *8104*
   * ``Server Address``: *bridge.measureofquality.com*

MQTT Setup
----------

#. Click on ``Uart Setting`` on the left sidebar menu
#. Under section ``Uart Parameter Setting``, change ``Baud Rate`` to

   * ``9600`` for **normal DUCT**
   * ``115200`` for **DUCT with O3**

#. Click on ``Network Setting`` on the left sidebar menu
#. Under the ``Cloud Setting`` section, change the following options:

   * ``Cloud Host``: *bridge.measureofquality.com*
   * ``Cloud Port``: *1883*
   * ``Cloud Topic``: *dst/airsns/duct*