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GE 0996D957G0001

Product Name:​ Mark V Serial Communication Interface Module (COMM)
Introduction:​ Asynchronous serial gateway enabling Mark V controller to talk Modbus, SRTP, DNP3 with external SCADA/HMI/meters.
Technical Specifications:
  • Ports:​ 1× RS‑232 DB9, 1× RS‑485 screw terminal
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Detailed content

  • Isolation:​ 500 VDC port‑to‑port optical isolation
  • Baud:​ 300–38400 bps software set
  • Protocols:​ Modbus RTU/ASCII, GE SRTP, DNP3.0
  • Parity:​ None/Even/Odd/Mark/Space
  • Power:​ 5 VDC backplane
    Functional Features:
  • Independent buffers per port
  • Watchdog on message timeout
  • LED TX/RX per port
    Working Principle:​ Serial frames converted to Mark V internal memory map objects, polled/responded by controller application.
    Structure:​ Compact card, DB9 bracket + terminal header.
    Installation:​ Install in VME communication slot, terminate RS‑485 with 120 Ω at ends, avoid parallel run with 600 V cables.
    Precautions:​ Wrong baud or parity = silent comms; RS‑485 bias resistors required on long runs.

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