Remote Level Control-Rotary Optical Encoder

The RDL D-RLC10 is a remote level control built around an optical rotary encoder. It supports single-location operation or coordinated control from as many as ten remote locations. An integral 0 to 10 VDC ramp generator and two open-collector pulse outputs provide the control signals required for compatible RDL VCA modules. A visual display shows the operating level, remains bright while adjustments are being made, and dims after adjustment. The unit also powers up at the last level used.

Ideal Use Cases

The D-RLC10 is designed for systems that require level adjustment from one or several control points. It is particularly suited to installations using RDL VCA modules because it is compatible with all modules in that category. Its support for up to ten remote control locations makes it useful when the same operating level must be accessible from multiple positions. The optical rotary encoder provides the primary level-control interface, while the visual display gives operators a clear indication of the active setting.

Why Choose This Model

This model combines rotary level adjustment, remote-location support, level indication, and control-signal generation in one device. Its integral ramp generator operates from 0 to 10 VDC, serving as an input in Slave mode or an output in Master mode. Two pulse outputs provide UP and DOWN signals using open-collector outputs rated at 20 mA. The D-RLC10 also retains the last level used when it powers up, reducing the need to re-establish the previous setting after power is restored.

The display behavior is designed around active use: it is bright during adjustment and dims afterward. This preserves immediate visibility while the encoder is being operated without leaving the display at full brightness continuously. Stainless-steel, black, and white versions are available to accommodate different installation finishes.

Installation and Integration

The D-RLC10 mounts in a standard US electrical box and is also compatible with RDL WB-series or SMB-series boxes. A cover plate is available separately. The unit requires ground-referenced 24 VDC power at 50 mA. Its listed dimensions are 4.11 inches high by 1.31 inches wide, with a depth of 0.98 inches without the knob; the source data also lists an overall depth of 0.545 inches and 3.93 cm.

Integration options include the 0 to 10 VDC ramp connection and the two open-collector pulse outputs. The ramp functions as a Slave-mode input or Master-mode output, allowing the control to participate in either operating arrangement. Available engineering resources include a PDF specification sheet, American DXF CAD files, and American DXF front and rear panel diagrams.

Performance Highlights

Pulse duration ranges from a minimum of 500 microseconds to a maximum of 4 milliseconds. The minimum interval between consecutive pulses is 500 microseconds. Approximate travel from minimum to maximum level varies with rotation speed: five rotations with slow movement and no acceleration, three rotations at medium speed with acceleration, or one fast counterclockwise rotation. This speed-dependent behavior allows the encoder to cover the operating range using different amounts of rotation.

The visual display continuously identifies the operating level and changes brightness according to whether an adjustment is underway. Together with last-level power-up behavior, the display and encoder provide both an operating reference and direct level adjustment at each configured control location.

What Makes It Different

The D-RLC10 is more than a standalone rotary control. It combines an optical encoder with a visual operating-level display, a built-in 0 to 10 VDC ramp generator, Master and Slave operating roles, and dedicated UP and DOWN pulse outputs. Its ability to support a single control point or expand to as many as ten locations distinguishes it for systems that need shared access to level adjustment. Compatibility with all RDL VCA modules further defines its intended integration path without requiring selection of a particular VCA model.

Final Assessment

The RDL D-RLC10 brings centralized functionality to remote level-control installations in a compact electrical-box format. It offers optical rotary control, visual level feedback, multi-location operation, adjustable-speed response, last-level recall, and direct compatibility with RDL VCA modules. For systems requiring one to ten level-control locations with Master or Slave ramp operation, it provides the specified control, display, mounting, and signal functions in a single model.