Brand:

• AMX

Models:

• SCL-1

Overview:

Use the AMX SCL-1 to scale a single HDMI input to a single HDMI output so the display receives a compatible, optimal resolution. Choose Auto Scaling (EDID-based) for “set-and-forget” operation, or force a fixed output resolution using the front DIP switch. Advanced users can manage EDID, output resolution, and CEC behavior via RS-232 API commands.

Key Points:

• What the SCL-1 does
  • Scales video so the output matches what the display supports
  • Supports 4K60 4:4:4 and HDCP 2.2 (modern sources/displays)
  • Typical use case: add scaling on installations where the upstream switcher output does not scale
• Audio behavior (important to know)
  • The scaler supports 2-channel LPCM audio
  • In both connection modes, EDID audio is forced to 2CH when copying EDID
• Connection “modes” you may encounter
  • Endpoint Mode (auto-detected when PR01-0808 is present)
    • Copies EDID (audio forced to 2CH), follows PR01-0808 behavior for HDCP/CEC coordination, and still uses DIP for scaling
  • Standalone Mode (no PR01-0808 detected)
    • EDID is controlled via RS-232 API (Copy EDID is default), HDCP info is automatic, and the SCL-1 controls CEC behavior
• Scaling configuration options (two ways)
  • DIP switch (fast): set a fixed output timing or Auto
  • API commands (advanced): when DIP is set to Auto (000), you can set/query output resolution and manage EDID via RS-232

How to use the SCL-1:

1. Select the output scaling mode (DIP switch)
   1. Locate the SCALER DIP switch on the front panel.
   2. Set the DIP switch to the desired mode:
      1. 000 = Auto Scaling (default)
      2. 001 = 3840 x 2160 @ 60 Hz
      3. 010 = 3840 x 2160 @ 30 Hz
      4. 011 = 1920 x 1080 @ 60 Hz
      5. 100 = 1920 x 1200 @ 60 Hz
      6. 101 = 1280 x 800 @ 60 Hz
      7. 110 = 1280 x 720 @ 60 Hz
      8. 111 = 1024 x 768 @ 60 Hz
2. Use Auto Scaling vs Fixed Scaling (when to choose what)
   1. Use Auto (000) when you want the scaler to choose the display’s preferred timing based on EDID.
   2. Use a Fixed DIP setting when you need a predictable output format (for example, standardizing what a display or downstream system receives).
   3. If the display shows no picture after changing scaling, return to Auto (000) to recover quickly.
3. (Advanced) Control and verify behavior via RS-232 API
   1. Set your serial session to: 9600 baud, 8 data bits, no parity, 1 stop bit, no flow control.
   2. Follow the command rules:
      1. End commands with T to execute (“Take”)
      2. Use X to cancel before sending T
      3. Commands are typically not case-sensitive
   3. Common “how-to” commands:
      1. Set output resolution (API method): CR#T
         • Example: CR1T sets output to 4096x2160@60
         • Note: The command list includes many resolution IDs, including AUTO.
      2. Verify current output resolution: SRT
         • Returns whether the unit is in fixed vs auto mode and the active timing.
      3. Set input EDID: CE#T
         • Example: CE1T sets EDID to 3840x2160@60_2ch
      4. Get current input EDID: SET
      5. Reboot / reset (use carefully):
         • Warm reboot: ~APP!
         • Reset system settings: ~SYSR!
4. (Advanced) Use CEC power control features (optional)
   1. Turn sink power on/off by CEC: CSP#T where # is 0 (OFF) or 1 (ON).
   2. Enable/disable automatic CEC power behavior: CSPA#T (0=Disable, 1=Enable).
   3. Set an auto power-off delay time (minutes): CD#SPT (1–30 minutes).
   4. Query current settings:
      1. Auto power enable: SSPAT
      2. Auto power delay: SDSPT

Troubleshooting and pro-tips

• Quick recovery tip
  • If a fixed resolution causes a blank screen, set the DIP back to Auto (000) to let the scaler follow the display’s EDID.
• Power LED is off
  • Confirm devices are powered and the correct-spec cables are connected properly.
• No picture on the display
  • Verify the source is outputting a valid signal and the display is functional.
  • If protected content is involved, confirm the display supports HDCP.
  • If there’s a compatibility issue, test with a different display model.
• “Snow” / mosaic artifacts
  • Usually indicates a cable/signal integrity issue—confirm HDMI cables are the correct spec and seated properly, then test with a known-good source.