SEAB 1F

The Seab 1F protocol (also known as Modnet 1F) developed by AEG enables the coupling of control station and substation belonging to the Geadat 120 product line. Seab simply refers to the expression 'serial installation bus' which also describes a possible topology of this protocol based on half-duplex operation. In other words, up to 128 substations can be operated by one control station in party line mode.

Also worth mentioning with respect to Seab 1F is that handshake signals normally employed in modem control are used to implement end of telegram recognition. These signals have to be controlled actively by the respective transmitting station, which demands highly accurate timing of these signals during communication.

But the physical connection can still be realized via a normal RS232/V.24 interface, either directly or via a special designated AEG modem connection of the UEM201 type. This means that data can be exchanged via the telecommunications network, if the required automatic calling modules have been installed.