Red Lion Controls LDD00400 6 Digit Display Marquee

LDD00400 is Red Lion Controls’ four-digit red Large Display (LD family), a high-visibility LED readout designed for industrial plant-floor applications. The model is specified as a 4‑digit red Large Display and is intended to be used with Apollo BCD slave modules, enabling it to be driven as part of a Red Lion data-display network. The 6‑digit counterpart in the same family is LDD00600, confirming that LDD00400 represents the 4‑digit variant. Red Lion’s LD/Large Display documentation presents these devices as plant-floor marquee style displays that can convey numeric values from connected controllers within the Red Lion ecosystem. This model’s designation and compatibility notes are consistently referenced across multiple official and distributor materials, underscoring its role as a dedicated large-format numeric display rather than a generic indicator.