Ccm-270A/Ws Network - Midea CCM-270A/WS Service Manual

CCM-270A/WS

5 CCM-270A/WS Network

The CCM-270A/WS gateway uses the M-net ports to connect to the Midea VRF units and the LAN port to connect to the
local area network or internet. A power cable of 24VAC needs to be purchased by the user himself to connect with the
centralized controller (CCM-270A/WS) and give power to the controller. The network topology for CCM-270A/WS is shown
in the picture below:
The CCM-270A/WS has six M-net ports (XYE), one LAN port, one USB extension port, and six reserved I/O ports(named as
D|1, D|2, DO1, DO2, A|1, A|2). It connects the Midea Central Air Conditioning system through the M-Net ports and
connects to the local area network or internet through the LAN port. The power cable for CCM-270A/WS is not supplied
with the box. The user needs to purchase it himself from the outside market. It is a 24 VAC supply power cable required for
the centralized controller. The XYE from the master ODU connects with the M-net port of the CCM-270A/WS. The
connection with the LAN can be made by the LAN cable or router depending up on the specific project configurations. Each
XYE port of the CCM-270A/WS can connect up to 64 indoor units or up to 8 refrigerant systems. There is a support for USB
2.0 also available in the CCM-270A/WS device which can be used to upload and download certain documents outputted
under the "Report" function of the centralized controller.
Important Points:
1. The CCM-270A/WS must be installed at one end of M-Net communication bus. Do not install it in the middle of the
communication bus.
2. It needs a three-core shielded cable of AWG 20-22 for communication wires.
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