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The STM2 has two modes: single wire which requires the switch to have a DC output where the polarity is reversed to indicate through/out position (the switch controllers use red/green LEDs), and two-wire mode where a voltage on either of the two inputs provides the switch position to the STM2.

IIRC, the MTH Realtrax switches use incandescent lights so you'll need the two-wire mode.  Try the two-wire  Atlas example in the owner's manual.

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