rrman posted:stan2004 posted:
Assuming you have an MTH Scaletrax ITAD as shown above. Using the terminology of the Atlas diagram shown earlier, the "PWR" and "COM" connections from the train transformer must be as shown above; this may seem swapped/backwards but this is how to emulate the insulated-rail trigger method using an ITAD.
You would need to jumper the outer rail(COM) terminal to the ITAD COM screw (remove any installed jumper first) to route the common (which is really ground that the Atlas board is looking for to operate).
Hi Sam,
Not sure I understand what you're saying. The ITAD has an internal connection which shorts (shown in ORANGE) the center "COM" screw-terminal to the adjacent screw-terminal as shown in following.
The ITAD's NO and NC outputs come from the far right ITAD terminal shown in BLUE in above photo. In other words the center "COM" screw terminal does NOT go to the common terminal of the internal SPDT relay. This is certainly not obvious and has been the source of much confusion, consternation, etc. The Lionel 153IR occupancy detector uses a similar scheme.
