In this FAQ you say that a Daisy Chain between DMX Input and / or Output Stations will result in a ‘non-compliant’ network. But the bid documents and/or bid drawings show a daisy chain?
You will, of course have to decide how to deal with this sensitive situation, but from a purely technical point of view here’s an explanation of why station-to-station interconnection via daisy chain is non-compliant: DMX-512 uses the EIA/TIA RS-485 wiring scheme. RS-485 provides for up to 32 nodes (transmitters or receivers) on a single linear bus. The linear bus is a single cable run is terminated at each end with a 120-ohm (nominal) resistor between data + and data -. Rack to Rack Daisy Chains are fine, because they are set up to be a true liner bus. That is, they are on a single cable run and terminated at each end. But this is a static or fixed Network – the wiring doesn’t change. But inputs and outputs are not static – they are designed to allow the owner to move the console from location to location. Passive stations, in the middle of the Daisy Chain, cannot be terminated without special hardware. If the owner plugs into, or out of, this Chain, they create a “T”. Only very short
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