Connection Of Communication Cables - Gree ME20-24/D1(T) Owner's Manual

Intelligent Controller
Statement on network topological method :
L1: L1 in the above diagram is RS485 bus, which is used for communication
between KWH meter and controller. Total length of L1 should not exceed 500m. The
number of KWH meters connected with L1 should not exceed 16.
L2: L2 in the above diagram is CAN2 bus, which is composed of controller and
the master outdoor unit. Total length of L2 should not exceed 500m and the number
of outdoor units should not exceed 16 (excludes salve module). (In theory, the total
length of CAN2 bus should not exceed 500m. In actual application, wire material
and environmental condition will affect the communication distance. Please refer to
the actual case.)
L3: L3 in the above diagram is the standard Ethernet connection line. Each
network cable should not be over 80m's long. All the controllers shall be connected
to router's LAN ports. The computer installed with Intelligent Billing Eudemon shall
be connected the LAN port of the same router.
L4: it indicates CAN1 bus, which is used for the communication between indoor
unit and outdoor unit. please refer to the Owner's Manual of air conditioners for the
length of L4.
L5: it indicates the power supply lines of indoor unit, getting the power from
nearby family lighting circuit.
L6: it indicates the power supply lines of outdoor unit. An electric meter can
connect one refrigeration system at the most.
When adopting network topology method, the power consumption of indoor unit
is directly calculated by the family electric meter because the indoor unit directly
connects to family lighting circuit. The billing system only conducts the statistics and
distribution for the power consumption of outdoor unit.
CAN2 network: One CAN2 network can be connected with 16 outdoor units
and 255 indoor units in maximum. If there are over 16 sets of outdoor unit or over
255 indoor units, two CAN2 networks must be used.
One controller can only be connected with one CAN2 network. One set of
Intelligent Billing Eudemon can be connected with 16 controllers.

8.4 Connection of Communication Cables

System is made up of different parts, so each part must be able to
communicate effectively. Communication connection includes:
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