A PSX-AR has the flexibility to control a Circuitron Tortoise using three methods:  

  1. Manual control using an SPDT Momentary Center Off toggle switch as shown in the diagram above  
  2. Issuing a DCC accessory command to the PSX-AR using your DCC throttle or a computer interfacing with your DCC system
  3. Auto-Throw whereby a locomotive exits the reverse section at the gaps:
    • A short circuit occurs and
    • The PSX-AR changes the phase to the reverse section rails [clearing the short at 0.03ms] and
    • When the PSX-AR changes the DCC track phase it also changes the direction of DC power going to the Circuitron Tortoise, thereby changing the position of the Tortoise

In essence, the SPDT MOM CO toggle switch mimics the scenario initiating Auto-Throw. Rather than a locomotive causing a short at the gaps, the toggle switch creates a short within the reverse section, requiring the PSX-AR to reverse phase.

Buy PSX-AR

Buy SPDT MOM CO Toggle Switch