Installation

Mounting the module

Mount CMi4110 in either a L+G UH50 heat meter or L+G UC50 calculator.

  1. Grab the module by the outer edges.

  2. Gently press it into position in module slot 2.

Connection of the antenna

CMi4110 is available in two different versions, with an internal antenna (CMi4110Int) or with an external antenna (CMi4110Ext). The internal antenna is already connected in the CMi4110Int.

External antenna

There are two different external antennas for CMi4110Ext, magnet-mount antenna and swivel-antenna. Order your desired antenna from Elvaco AB or Landis + Gyr accessory assortment.

  1. Use the SMA connector to connect the external antenna.

  2. Route the antenna cable.

Caution

If using an external antenna, make sure to mount it at least 0.5 meters away from the meter in order not to cause interference.

Activating the module

Upon delivery, the module is set to passive mode, which means no messages will be transmitted from the module. There are two ways to activate the module:

Via the module push button
Via Elvaco OTC app

Tip

If the module is installed in the meter, the NFC field is easiest accessible if placing your smartphone at the lower part on the right hand side of the meter.

Joining the LoRaWAN network

After activation, CMi4110 will attempt to join the LoRaWAN network. The phase is indicated by short flashes every 5th second on the green LED. When CMi4110 succeeds in joining the LoRaWAN network, the green LED will lighten up for 8 seconds.

CMi4110_LED_indications_Network_join_.png

Network join LED indication

When the module has joined the LoRaWAN network, meter data will initially be transmitted from the module every minute (regardless of transmit interval settings) in order to set the right data rate. After 10 minutes of calibration, the module will start to deliver meter data using its configured settings.

Note

When activation-by-personalization (ABP) is used, the module does not perform a join operation before sending messages. Therefore, the 8-second indication of connection will not appear in ABP mode.

Attempts to join the network for firmware version <1.07

If the module fails to join the LoRaWAN network after the first 6 attempts, it will backoff for more time for each new retry until the delay between each retry is more than hours. This is initiated to conserve battery.

A new join attempt cycle can be manually started anytime by pressing down the push button (2) for at least 5 seconds, until the green LED lights up, and then release the button. It will do retries on both DR0 and DR5.

Attempts to join the network for firmware version >=1.07

The module tries to join the LoRaWAN network with six requests, seven seconds apart, then sleeps for twelve hours and then sends another six requests. This sequence goes on forever.

A new join attempt cycle can be manually started anytime by pressing down the push button (2) for at least 5 seconds, until the green LED lights up, and then release the button. It will do retries on both DR0 and DR5.

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