dmx_basics:dmx_in_practice
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| dmx_basics:dmx_in_practice [2012/01/06 07:28] – Jan_K | dmx_basics:dmx_in_practice [2013/03/11 03:45] (current) – external edit 127.0.0.1 | ||
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| If a fixture like above starts on address 20 and uses 12 addresses then the next fixture address must be at address 32 to avoid overlapping.\\ | If a fixture like above starts on address 20 and uses 12 addresses then the next fixture address must be at address 32 to avoid overlapping.\\ | ||
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| - | The maximum no of fixtures in a chain are 32 and his is due to load on the driver circuit. | + | The maximum no of fixtures in a chain are 32 and his is due to load on the driver circuit.\\ |
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| - | The last fixture in the chain has to be terminated with a DMX end or terminator. | + | The last fixture in the chain has to be terminated with a DMX end or terminator.\\ |
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| **Why DMX end / termination**\\ | **Why DMX end / termination**\\ | ||
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| It is important to terminate the cable with 120 ohm to avoid reflection on the cable which courses the DMX signal to bounce back to the fixture.\\ | It is important to terminate the cable with 120 ohm to avoid reflection on the cable which courses the DMX signal to bounce back to the fixture.\\ | ||
| The reflected signal may course the fixture to mal function.\\ | The reflected signal may course the fixture to mal function.\\ | ||
| + | See eventually: [[dmx_basics: | ||
| Some fixtures has a build in 120 termination that can be activated.\\ | Some fixtures has a build in 120 termination that can be activated.\\ | ||
| + | \\ | ||
| + | To build a DMX terminator/ | ||
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| Additional for the optimal performance use cable with a characteristic impedance of 120 Ohms.\\ | Additional for the optimal performance use cable with a characteristic impedance of 120 Ohms.\\ | ||
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| And it makes it a bit easier when fixtures are at different places. It is then not a puzzle to get one cable string to all fixtures.\\ | And it makes it a bit easier when fixtures are at different places. It is then not a puzzle to get one cable string to all fixtures.\\ | ||
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| - | Finally if it is a optical isolated splitter then there are no electrical connection between the paths.\\ | + | Finally if it is a optical/ |
| This eliminate problems with ground loops and spikes when lamps are turned on.\\ | This eliminate problems with ground loops and spikes when lamps are turned on.\\ | ||
| The controller is also protected this way.\\ | The controller is also protected this way.\\ | ||
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