How long and what topology can the IOU bus be on a Netcontroller?
- IOU Modules
Maximum cable distances and topologies required.
The Standard RS485 modules can only be connected in a bus (Daisy Chain) topology, no star or "T" topology can be used.
The maximum distance from the Netcontroller to the last module in the bus is 600M using a low capacitance cable like the Belden 9729.
If you have to create a free topology network with a star or "T" topology then you must use FTT-10A Netcontroller and IOU Modules.
See What is the advantage of having a Doubly Bus Terminated Topology segment VS Free Topology in a LON F... for details on the FTT-10A module wiring or the I/O System Reference Guide for further installation details.