DCC interface for the Tomix 5569 TCS Automatic Crossing System

This is the first test of a prototype DCC interface for the "Tomix 5569 TCS Automatic Crossing System". The DCC decoder uses an Arduino Nano, the interface to the Tomix 5569 is simply made of four transistors:

• The Tomix 5569 has four TCS sensor input connectors, #1, #2, #3 and #4
• Each has two inputs, one for each direction
• For each connector, direction 1 is activated by connecting GND (pin 2, centre) to pin 1; direction 2 is activated by connecting GND to pin 3

I use the four sensor inputs, using only one direction per sensor, according to figure 29 page 16 of the manual.

Sensor #3 for train entry detection (activation) from the left direction

• Sensor #4 for train exit detection (deactivation) from the left direction
• Sensor #2 for train entry detection (activation) from the right direction
• Sensor #1 for train exit detection (deactivation) from the right direction

The left and right directions are independent, they can be activated and deactivated independently.

All DIP switches are left at their default position (up) except DIP switch #2 which is set to down to permanently store the barrier speed.