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.
||Seab1N Application Layer|
||FT 1.2 as specified in IEC 60870-5-1|
||RS232 / V.24 (UART-Conform)|
Supported Information Types
- Single Command
- Setpoint [16 bit]
- Single indication [1 Bit]
- Single indication [1 Bit] with time tag
- Measured value [8 bit]
- Measured value [11 bit]
- Counter value [16 bit]
RS232 / V.24 (UART-Conform), Half-Duplex
Unbalanced transmission: Party Line or Point to Point connections
Transmission of pulse commands
Transmission of setpoints
Spontaneous transmission of indications with or without time tag, measurands, counters, ...
Requested transmission of indications, measurands, counters, ...
User defined services
Physical address: 0..255
Logical adddress: 1..65535
Information object address: 1..65535
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