8020-SCP-444

About the 8020-SCP-444

• The 8020-SCP-444 module is a Model 400 processor.
• Features a 16K RAM/PROM Mix with Floating Point.
• Developed and manufactured by Square D.
• Part of the SY/MAX 8020 series of processors and related products.

LED Indicator Lights

• Seven LED indicator lights located on the top of the device.
• Purpose: Show the status of the processor unit, controlled by the user.
• Indicator Light Labels:
  • RUN
  • HALT
  • MEMORY
  • FORCE
  • I/O
  • BATTERY LOW
  • WRITE PROTECT

Battery Access and Key Switch

• Battery Access Door:
  • Located below the LED lights.
  • Secured by a small screw on the right side.
  • Features black text: "BATTERY INSTALLED DATE" with a small white label for writing the installation date.
• Metal Key Switch:
  • Located below the battery access door.
  • Has four positions (from left to right):
    • DISABLE OUTPUTS
    • HALT
    • RUN
    • RUN PROGRAM

Communication Ports

• PRGMR CHNL 1: Small port located just below the key switch.
• COMM CHNL 2: Small white label indicating a port on the bottom part of the device, with a downward-pointing arrow.