M-3919A Graphic Display Unit/ Human Machine Interface

Graphic Display Unit (GDU) and Touch Screen Human Machine Interface (HMI) for Communicating with One or Two M‑4272 Digital Motor Bus Transfer Systems.

  • Provides a MIMIC Single-Line Diagram of the Motor Bus Transfer System in Two-breaker or Three-breaker Bus Transfer Configuration
  • 16.2 Million Color 1024 x 768 Pixel TFT Display
  • 12.1 Inch Touch Screen Human Machine Interface (HMI)
  • Includes a separate power supply, nominal 120 Vac (50/60 Hz) or 125 Vdc (250 Vdc optional)
  • Remote Target Reset Capability
  • Remote Manual Transfer Capability


The M-3919A includes the following features and functions:

  • Display & Touch Screen
    • 12.1″ TFT 16.2 Million colors
    • Size – 9.75″ x 7.25″ [248 mm x 184 mm], 12.1″ diagonal
    • Brightness – 500 cd/m2
    • Contrast Ratio – 700:1
    • Resolution – 1024 x 768 pixels Backlight – LED up to 50,000 hour life span
    • Touch Screen Type – 4-wire Analog Resistive
  • Microprocessor – 800 MHz 32-bit CISC (Fanless CPU)
  • Flash Memory – 256 MB
  • DRAM – 256 MB
  • Material – Aluminum Enclosure
  • Serial Ports
    • The M-3919A includes two serial ports, which provide the connections to one or two M-4272 Digital Motor Bus Transfer Systems using RS-232 (standard) or RS-485 (optional) communications. The RS-485 serial port also provides the ability to connect multiple M-4272’s in series to a single HMI. The M-3919A serial communication ports include the following capabilities:
    • One RS-485 serial port (DE9S) used for RS-485 M-4272 communications
    • One RS-232 serial port (DE9P) used for RS-232 M-4272 communications
    • Baud rates from 9,600 to 115,200
    • Point-to-point serial communications for all protocols
  • One 10 foot RS-232 Y Cable, BECO Part Number B-1527
  • Compact SD Card Slot
  • USB Ports – 1 Host 2.0 Port, 1 Client 2.0 Port
  • Ethernet Port – 10/100 Base-T (RJ45) used for Operator Interface Terminal (OIT) (PC) configuration, downloading program to HMI and Point-to-Point connection and communications using MODBUS TCP/IP.
  • PWR (yellow) illuminated icon indicates if power is applied to the unit
  • CPU (green) illuminated icon indicates if the unit is operating correctly
  • COM (red) illuminated icon indicates communications activity on PLC port
  • RESET Switch to reinitialize the unit if an operational failure occurs