DC-DM-ROOFTOP-IOM-1801-E - 30 -
DC-DM 5
Communication Master/Slaves
If the communication bus Master/Slaves is connected between several Unit (Maximum 8)
The 'DM', connected on this bus, allows viewing, alternatively, information of all connected units.
5.1 Connection
The inter-bus boards (pLan) Climatic™ connects to connector J8 on the BM.
'Star’ connection is not recommended for optimum performance. It is advisable to connect a maximum of two cables
per unit.
Warning:
The BM 24Vac cards should not be connected to the 'Earth'
5.1.1
Cable Features
The connection must be wired as follows:
- For a length of 0 to 300m: AWG22 (0.34 mm ²), a twisted pair shielded.
- For a length of 0 to 500m: LiYCY-P (0.34 mm ²), a pair overall shield.
The cable length should not exceed 500m.
For better protection of electromagnetic disturbances Lennox recommends the installation of cable LiYCY-P
5.1.2
Setting
Each Climatic™ must be set with a communication address different.
The address setting must be done with a DS in (3171).
The value of the addresses must be between 1 and 8
Each Climatic™ must be set with the same number of identification Master (ID).
The ID must be equal to the communication address of the card where the DC is connected.
The ID setting must be done with a DS in (3173).
Each Climatic™ must be set with the same sub-bus identification.
The sub-bus setting must be done with a DS in (3172).
For each Climatic, with a DS, you must set in (3151) the type of remote display, DC or DM.
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