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My Digitrax Zephyr has a jump port with 3 connections, 2 for two cabs and 1 for common.

For those who don't know, the jump port allows you to connect up regular controllers as additional throttle inputs to the DCC command station.

My question is can I hook it up to my MRC280 dual controller? This is a standard type of controller with dual speed controls. This has 4 connections, two for each speed control. So is it safe to short two of them together to make a common for the Zephyr's jump port

This would imply that the two speed control circuits inside the MRC280 are completely isolated and come from separate transformer windings. Is this the common practice? I can't find anywhere in the instructions that it is safe to short two of the outputs together but I guess this is what people would do if they are wiring a layout dual cab common return
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