SEAB 1W

The SEAB 1W protocol (also referred to as Modnet 1W) developed by AEG is primarily based on the widely known IEC 870-5 standard (see also IEC 60870-5-101) using the FT1.2 format class for the link layer. It supports unbalanced data transmission (master/slave principle) and enables the coupling of several substations to a single line.

Only a small part of the full range of functions supplied by the IEC was implemented, and previously varying parameters, such as the number of address bytes, have now been clearly specified for the first time. Minor changes were made, for instance in the way time stamps are encoded.

ISO/OSI Model

7 Application Layer Seab1N Application Layer
6 Presentation Layer n/a
5 Session Layer n/a
4 Transport Layer n/a
3 Network Layer n/a
2 Link Layer FT 1.2 as specified in IEC 60870-5-1
1 Physical Layer RS232 / V.24 (UART-Conform)

Supported Information Types

Control Direction
  • Single Command
  • Setpoint [16 bit]
Monitoring Direction
  • Single indication [1 Bit]
  • Single indication [1 Bit] with time tag
  • Measured value [8 bit]
  • Measured value [11 bit]
  • Counter value [16 bit]

Protocol Features

  • Physical Layer

    RS232 / V.24 (UART-Conform), Half-Duplex

  • Link Layer

    Unbalanced transmission: Party Line or Point to Point connections

  • Application Layer

    Transmission of pulse commands
    Transmission of setpoints
    Spontaneous transmission of indications with or without time tag, measurands, counters, ...
    Requested transmission of indications, measurands, counters, ...
    General Interrogation
    User defined services

  • Address Space

    Physical address: 0..255
    Logical adddress: 1..65535
    Information object address: 1..65535

Applicable Products

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  • ipConvPBS
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  • ipConvPBM
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  • ipConvPNS
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