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The CMB-41012 provides the connections for the Ethernet and Serial communication as well as the D-Sub connector for the Extended I/O. The CMB-41012 also contains the 8x2 character LCD. 

C012 Communication Board

The CMB-41022 differs from the CMB-41012 (default) in that it has second Ethernet port, as shown in the figure. The CMB provides the connections for both Ethernet and Serial communication as well as the 44-pin HD D- Sub connector for the Extended I/O. An 8x2 character LCD screen is used to display the status of each axis, or can display a custom message if desired.

C022 Communication Board