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COMMUNICATION
LENNOX units implement Modbus slave protocol with the following settings:
Transmission Mode
The BMS mode is activated by the iinitialisation of the watchdog value. The watchdog is automatically decreasing every second.
It's therefore necessary to frequently overwrite the watchdog value not to let it fall to 0. If the watchdog reaches 0, the BMS mode is
disabled and the unit comes back to the schedule mode.
Settings
The different settings to confi gure the BMS are available in the menu:
• (3826): unit identifi cation number on the BMS network,
• (3827): protocol communication with the BMS,
• (3828): Baudrate with the BMS.
• 66 •
Serial Line
Baudrate
Data bits
Parity
Stop bits
RS485 (EIA/ TIA - 485 Standard)
RTU (Remote Terminal Unit)
1200→19200 Bauds
8 bits
None
1 bit
CL60-AC CHILLER-IOM-1011-E
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