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101 display basics
How does voltage drop affect the data line?
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[QUOTE="AAH, post: 98402, member: 543"] It actually depends on the controller as well as the cable. Most controllers should do 10m+ these days. J1Sys controllers which are virtually obsolete now were more like 3-5m. Pixel to pixel distance is typically maxed out around the 5m mark. There's a video on the bottom of [URL]http://www.hansonelectronics.com.au/product/null/[/URL] that shows the difference between what you can get with pixel to pixel distance with and without a buffer. The same applies when/if you have distance issues from a controller. Unlike the need for power injection like occurs with pixels with data it's actually the rounding of the signal due to cable capacitance that is the limiting factor. The further the data has to travel the less like the original square wave it started as it looks like. The voltage does go down but it's not due to lack of voltage. The pixel cable is both resistive (which is why you need power injection) and capacitive. The effect of the 2 changes the shape and voltage. See the attached pic. The data signal starts off like a) and progressively gets more like c) but unlike in the picture the voltage reduces. [/QUOTE]
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How does voltage drop affect the data line?
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