Command reference for diagnosing traffic signal controllers over a serial terminal, grouped by controller family. HHTraff provides VT100 emulation, so the commands are the controller’s own — the app is the terminal, not a translation layer.
Covers New Zealand and Australian ATSC4-generation controllers (Aldridge ATSC4, Tyco Eclipse, QTC), UK TOPAS 2500B, and North American NEMA TS2, across phase timing, lamp and fault diagnostics, detector status and log queries.
See also: Controller compatibility, Troubleshooting, and about HHTraff.