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485 wiring With 485 hubs and 485 repeaters can be arbitrarily arranged into star-type wiring and tree wiring. The 485 cabling specification is a cabling that must be handed in hand. Once a star connection and a tree connection are directly routed without the aid of a 485 hub and a 485 repeater, it is easy to cause signal reflections that can cause bus instability. Many construction parties use star-type wiring and tree wiring in the 485 wiring process. Sometimes the whole system is very stable, but sometimes there are always problems and it is difficult to find the reasons. Generally, it is due to irregular wiring. Caused by.