Inputs / Outputs Climatic Boards - Lennox CLIMATIC series User Manual

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Table Of Contents

Table of Contents

COMMUNICATION

LENNOX units implement Modbus slave protocol with the following settings:

Transmission Mode

Settings

The different settings to conﬁ gure the BMS are available in the menu:

(3181):

address of the unit (bus id)

(3182):

choice of type of protocol

(3183):

choice of speed of bus

(3184):

watchdog counter

«Watchdog» functionality with CLIMATIC.

As the CLIMATIC is passive on the bus, it cannot detect a communication failure with BMS; if any, the Roof-top would continue to

operate with the last setting sent by the BMS before the failure whatever they were.

In order to avoid this scenario and tell regularly the CLIMATIC that it is still connected to the BMS, the BMS system has to send regularly

to the adress 01h a number above 0.

On its side the CLIMATIC is decreasing the adress 01H value of 5 units every 5 seconds. If the adress 01H reach 0, the CLIMATIC

consider the communication as lost and switch to stand alone mode.

Example, the BMS is sending the value 1000 to the adress 01h, after 200s if the BMS has not sent anything else, the value will reach

0, the CLIMATIC will consider the communication as lost and the unit will regulate with its own parameters.

Modbus, BACnet, Trend, Carel

Please see the different corresponding tables in the appendix 1.

LonWorks

Please see the different corresponding tables in the appendix 2.