The FLS-C(H) provides a Synchronous Serial Interface (SSI). SSI is a widely used serial interface standard for industrial applications between a master (e.g. controller) and a slave (e.g. FLS-C). On an SSI communication channel, the master generates a clock, while the slave sends the data corresponding to the received clock signal. Only point to point communication is possible with the SSI interface. The RS-422 standard defines the electrical signal levels of the SSI interface.