Installation

Mounting the product

CMi4140 can be used in a Kamstrup MULTICAL® 403, MULTICAL® 603, or a MULTICAL® 803 heating/cooling meter. If the module is not mounted in the meter upon delivery, it is easily installed:

Caution

This is an electrostatic-sensitive product. Observe the necessary ESD protective measures when installing the product.

  1. Open the meter housing.

  2. Apply ESD precautions. Make sure you are grounded (e.g., by touching the meter’s metal pipe or a metal part which is electrically connected to it).

  3. Install the device. Hold the device by the outer edges and gently press it into position in an available slot in the meter.

  4. Attach the LoRaWAN® antenna. Route the antenna cable using the guiding pins in the meter housing (if using an external antenna). Connect the antenna to the MCX connector on the module (applies to both the internal and external antennas).

    Caution

    When using an external antenna, make sure to mount it at least 0,5 meters away from the meter to avoid interference.

  5. Close the lid of the meter. When closed, the device will receive power from the meter

Connecting the LoRaWAN® antenna

CMi4140 supports either an internal or external LoRaWAN® antenna. Since both antennas use the MCX connector, they are interchangeable.

  1. Connect the internal or external antenna with the MCX connector to the module in the meter.

  2. Route the antenna cable (if using an external antenna).

  3. Push the connector gently into the socket on the module.

Caution

When using an external antenna, make sure to mount it at least 0,5 meters away from the meter to avoid interference.

Activating the product

Note

Before activating the device and trying to join a LoRaWAN® network, make sure the LoRaWAN® network server in use is prepared with necessary device- and security-related information. Security keys for Elvaco devices can be accessed in Elvaco EVO, Elvaco EVO Login.

Upon delivery, the device is set to inactive mode, which means no messages will be transmitted until it is activated. It can be activated in two ways: via the buttons on the meter or via the Elvaco OTC App:

Activation via the meter buttons

  • On MULTICAL® 403, press and hold both buttons on the front of the meter until “CALL” is displayed.

  • On MULTICAL® 603 and MULTICAL® 803, press and hold the two arrow buttons on the front of the meter until “CALL” is displayed.

Activation via the Elvaco OTC App

  1. Open the Elvaco OTC app (available for Android and iOS).

  2. Scan the device (make sure NFC is enabled on the phone).

  3. Go to Apply mode.

  4. Set the power mode to Active.

  5. Select Apply settings.

  6. Scan the device to apply new settings.

    To verify that it has been activated, go to Inspect, scan the device, and make sure that power mode is set to Active.

NFC scanning position

MULTICAL® 403: Place the phone in the center of the raised section on the back of the meter.

MULTICAL® 603: The meter has two slots:

  • Left slot: Middle of the raised back section

  • Right slot: Right side of the raised back section

MULTICAL® 803: Open the meter and place the phone close to the device.

LoRaWAN® end-device activation

Before being able to transmit data over a LoRaWAN® network, the device must be personalized and activated. This can be done in two ways: Over-the-air activation (OTAA) or Activation by Personalization (ABP). For security reasons, Elvaco strongly recommends using OTAA, where all network keys are generated each time the device joins the LoRaWAN® network. In contrast, for ABP, all keys are set manually and stay constant over time. The tables below list the required information depending on the activation mode.

In OTAA mode

Device EUI

16-digit unique identification number (not configurable).

Application key

The application key of each device is generated by Elvaco and used in OTAA mode to generate network keys when it joins the LoRaWAN® network.

JoinEUI

Sets the identification number of the join server. The identification number is set to a default value in all devices. The default value is presented in Elvaco OTC configuration options.
In ABP mode

Device EUI

16-digit unique identification number (not configurable).

Application session key

Used for payload encryption and decryption.

Network session key

Used by both the device and the network server.

Reading the module status via meter display

In addition to the Elvaco OTC App, the current status of the module can be read via the meter display. To retrieve the status of the module via the meter display, enter the tech loop of the meter display and request the module status information. For detailed information, see the Kamstrup MULTICAL® Technical description.

The following table provides a description of how the current status of the module is read from the meter display.

As an example, if the display shows “5311111”, that means that the module has been activated and has successfully joined the LoRaWAN® network.

Table 278. Module status indication on meter display

Character, MSB -> LSB

Status

1-2

53 = Module identification number (CMi4140)

3

1 = All following characters are set to “1”

0 = One or more of the following characters are set to “0”

4

1 = Meter has granted active mode for the module

0 = Meter has requested the module to be idle

5

1 = Module has joined the LoRaWAN® network

0 = Module has not joined the LoRaWAN® network

6

1 = Module SuperCap has been charged

0 = Module SuperCap is charging

7

1 = Module is active

0 = Module is inactive

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