SICK ISD systems together with infrared light can be used to form cable-free transmission links for serial data in full-duplex mode - this does always with trailing cables. A link always consists of one device pair (2 device units) with different carrier frequencies.

Depending on the configuration of the transmission link, the device units are either installed in a fixed station and a mobile station (variable link) or both are installed in a separate fixed station (fixed link).

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