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Expansion cables (10-conductor ribbon cable) are necessary to connect expansion modules to an X-400 or X-600M controller. The large expansion modules (X-18s, X-19s, and X-20s) have two expansion ports, and come with a 5-inch expansion cable with two connectors which allows it to connect to the X-400 or X-600M along with other expansion modules.
We recommend to first connect all large expansion modules to the X-400 or X-600M, and then connect any smaller expansion modules (X-11s, X-12s, X-13s, X-15s, X-16s, X-17s).
