Black Box Corporation ICD102A repeater

DIN-rail repeater with opto-isolation

The Black Box ICD102A is a DIN-rail mounted signal repeater that provides opto-isolation for RS-422 and RS-485 serial lines. It regenerates data signals to extend cable runs beyond standard distance limits while protecting connected equipment from ground loops and voltage spikes. The unit is designed for industrial automation networks requiring reliable long-distance communication.

Installers extending serial buses in noisy

This repeater suits engineers who need to lengthen RS-422 or RS-485 segments in factories, process plants or building management systems where electrical interference is a concern. It is not intended for installers who require multi-drop expansion beyond signal regeneration, protocol conversion to Ethernet or fibre, or integrated surge protection beyond the opto-isolation barrier.

Opto-isolation voltage rating

The single specification that determines suitability is the opto-isolation withstand voltage, which defines the maximum ground-potential difference the device can safely block between connected segments. If the installation's common-mode voltage exceeds this rating, the repeater cannot guarantee signal integrity or equipment safety.