Once the pedal is configured, it is then plug and play with the TS Controllers software, with no setup to get working with train sim. Download the TS Controllers Interface software

If buying your own pedal follow the instructions below, otherwise to to the Getting started (All pedals) section

By default, many pedals are programmed to enter a single key when pressed. For example the b key. You don’t want that as whenever you are pressing down the pedal in game, it will be pressing the ‘b’ key, and applying the horn. The software doesnt use keyboard commands to make the DSD function, as it detects the Pedal being pressed via the Windows hardware interface.
To solve this problem, the pedal needs to be configured to enter a different command that does not affect any in game or other functions.

If you are using a PC Sensor made foot pedal, this is easily configured using the ‘FootSwitch’ software. This can be downloaded from here

The pedal DOES need some function assigned to make it detectable. I would recommend setting the pedal function to F24, as this is not a commonly used function in any app, or Windows.

Here is what the software set to F24 should look like:

Getting started (all pedals)

Download the latest TS Controllers Interface software to get started here

There is a DSD Pedal tab once in the software. You will need to activate/unisolate the DSD in the Train Sim cab.
This is Shift+ Enter in TSW and usually Ctrl+D in Train Sim Classic. With compatible add-ons, when the DSD is active, the alarm will usually go off when the pedal isnt held down (and the brakes will be applied).

Note: By default, the DSD pedal is forced down when you enter the cab, even once you have unisolated it, so you will need to tap the pedal once to let Train sim know there is a pedal.

The below video demonstrates usage in Train Sim World 6.