STL Studio

Build logic for Tower LCC+Q; copy the generated STL into your node via Configure Nodes.

Generated STL

Output format:

Split view (raw + expanded)

Show line numbers

// Drag blocks from the left; the code updates as you edit. Use Copy or Download to use it.

Select Variable

Download

Choose a file to download. Other options appear when the relevant data is loaded (e.g. from a config backup or friendly names).

File name (for STL)

CSV files

ZIP includes group_logic.csv (if you have logic) and all four JMRI CSVs. Empty files include headers only so JMRI can import the set.

Q+ backup

Import STL code

Paste your STL program below (one statement per line). Supported: CLR, SET, A/O/AN/ON/LD Ix.x, =/S/R Qx.x, label:, JC/JCN/JU label, // comments.

Drop a file here or

Clear workspace before import

Help

How the blocks work together

As the program runs, the device keeps one “result” at a time: either yes (true) or no (false). Your blocks either change that result or use it.

“Check that …” blocks (and / or conditions) build up the result: the first one sets it from that input, and any more combine with it (like “input A and input B”).

“Clear” and “Set” reset the result. So do outputs (Turn output ON/OFF, Turn ON, Turn OFF), jumps, and Start timer. After any of those, the next “Check that …” starts from scratch instead of adding to the previous result.

Example: if you use Start timer and then Check that T3 is ON, that check is on its own—the output stays off until the timer finishes, then it can turn on. That’s why “Start timer” is in the “resets the result” group.

For technical details (and to see the result in real time), try the Q-debugger (by Dwight Kelly). The summary above was derived by AI from the reference Understanding the STL Logic String (Dave Sand, Layout Command Control group).