Pepperdash.Essentials.Plugins.DaLite.SCB200 1.0.0-feature-initial-development.3

Da-Lite SCB-200 Essentials Plugin (c) 2026

License

Provided under MIT license

Overview

Essentials plugin for the Da-Lite SCB-200 Serial Control Board, the RS-232 serial controller factory-installed in Da-Lite motorized screens.

Beyond basic up / down / stop, the SCB-200 exposes Da-Lite's Screen Positioning System, so this plugin also supports absolute and relative positioning (encoder counts, inches, millimeters), the ten aspect ratio presets, and status readback including screen limits, viewing area dimensions, calibration state, AC motor current and error reporting.

The plugin talks to the controller over either RS-232 port, or over TCP/IP when the optional NET-200 Ethernet daughter board is installed.

Dependencies

The Essentials libraries are required and are referenced via NuGet. They are restored automatically on build.

Hardware Connection

The SCB-200 RS-232 ports are fixed and cannot be reconfigured:

When connecting through a NET-200, the factory default endpoint is 192.168.1.100 on TCP port 10001.

Up to eight SCB-200 boards can be daisy-chained over RS-485 and addressed independently by DIP switch, with ID 0 as the master. Only the master's RS-232 and IR ports are active; configure one Essentials device per board and set deviceId to match each board's DIP switch address.

Configuration

Device types recognized by the factory: dalitescb200, dalitescreen, scb200.

Serial

{
  "key": "screen-1",
  "name": "Main Screen",
  "type": "dalitescb200",
  "group": "shades",
  "properties": {
    "control": {
      "method": "com",
      "controlPortDevKey": "processor",
      "controlPortNumber": 1,
      "comParams": {
        "baudRate": 9600,
        "dataBits": 8,
        "stopBits": 1,
        "parity": "None",
        "protocol": "RS232",
        "hardwareHandshake": "None",
        "softwareHandshake": "None"
      }
    },
    "deviceId": 0,
    "pollTimeMs": 30000,
    "warningTimeoutMs": 180000,
    "errorTimeoutMs": 300000,
    "displayDeviceKey": "display-1",
    "screenLiftType": "screen"
  }
}

TCP/IP (via NET-200)

{
  "key": "screen-1",
  "name": "Main Screen",
  "type": "dalitescb200",
  "group": "shades",
  "properties": {
    "control": {
      "method": "tcpIp",
      "tcpSshProperties": {
        "address": "192.168.1.100",
        "port": 10001,
        "autoReconnect": true,
        "autoReconnectIntervalMs": 10000
      }
    },
    "deviceId": 0,
    "displayDeviceKey": "display-1",
    "screenLiftType": "screen"
  }
}

Properties

The SCB-200 sends no unsolicited position updates, so the plugin polls position every movingPollTimeMs while the relay reports motion, and stops once the relay reports ST.

Screen Semantics

The plugin implements IProjectorScreenLiftControl and the Essentials shade interfaces. Raise() and Lower() describe the physical motion and are unambiguous. The shade methods follow the shade convention, where the covering retracts to "open":

• Open() == Raise() — screen up / stowed
• Close() == Lower() — screen down / deployed

Bridge Join Map

Digital

Analog

Serial

Protocol Notes

Commands are framed as # <id> <verb> <parameter> [values]<CR> and acknowledged as ! <id> ...<CR>. Acknowledgements addressed to a different device ID are ignored, so several boards can share an RS-485 bus. The instruction book is inconsistent about whether the GE / SE verb is echoed in the acknowledgement (compare ! ID GE RE UP with the worked example ! 0 RE DN), so the parser treats it as optional. Likewise, set acknowledgements may interleave a status token with the value (! 0 SE IN OKC 12.0), so the first parsable number in the response is used.

Error codes 13-29 from Appendix A are decoded to text on the error message join.

Generating a NuGet Package

A NuGet package is generated automatically on build. To modify the package details, edit these properties in src/epi-dalite-scb200.4Series.csproj:

1. PackageId — the name used to pull the package from NuGet once published
2. PackageProjectUrl — the plugin repo URL
3. AssemblyTitle — the dll file name shown on a processor when the plugin loads