CDC Type I

Developed by the EMPROS company, the CDC Type I protocol enables communication between control stations and RTU 44-500 or 44-550 substations.

The physical layer operates in a proprietary PCM mode.

Supported Information Types

Control Direction
  • Double Command
  • Setpoint [12 bit]
Monitoring Direction
  • Single indication [1 Bit]
  • Measured value [12 bit]
  • Counter value [16 bit]

Protocol Features

  • Physical Layer

    proprietary PCM encoding, half-duplex

  • Application Layer

    on-demand transmission of digital, analog and counter values
    Direct transmission of commands and setpoints
    "Select before operate" transmission of commands and setpoints

  • Address Space

    RTU addresses 0..13
    up to 128 16-bit words with up to 16 digitals each
    up to 128 analogs

Implemented Protocol Stacks

CDC Type I, Slave

Applicable Products

  • ipConv

    Universal protocol converter for highest degree of flexibility


  • Neptune RTS
    Neptune RTS, USA

    Products: ipConv
    Protocol Stacks: DNP V3.00, Slave Simatic TDC, Master Modbus, Master CDC Type I, Slave