Definition
A firing module, or receiver, is the box of the firing system installed on the firing site, as close as possible to the fireworks, that receives commands from the desk and delivers the ignition current on its outputs. A module most often has 8, 16, 32 or 64 cues, each a pair of spring or screw terminals where the igniter wires are connected. It runs on its own battery, communicates by cable or radio, tests the continuity of every cue and shows line status; its current capacity sometimes allows several igniters in series on one cue. A mid-sized display uses 5 to 20 modules, spread along the firing lines and numbered; the firing plan assigns each product its module-cue pair.
In practice, for the display company
The number of modules available is a hard limit on the show: a missing cue on show night cannot be recovered. PyroDesk knows the company's fleet of modules, assigns firing-plan cues module by module, flags an overflow and prints the wiring sheet per module; the firing mode of each job is inferred from the modules assigned.