Timeline for DMX: What should I do with ground and shield?
Current License: CC BY-SA 3.0
12 events
| when toggle format | what | by | license | comment | |
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| Jan 4, 2018 at 9:23 | comment | added | Benjamin J. | @DwayneReid: I've added a simplified schematic (see the edit above). | |
| Jan 4, 2018 at 9:22 | history | edited | Benjamin J. | CC BY-SA 3.0 |
added 127 characters in body
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| Jan 4, 2018 at 0:25 | comment | added | Dwayne Reid | You said: "pin 1 of the XLR connector is connected with the ground of the DC-DC converter". Can you post a simple line drawing of both the ends of the DMX signal path? Be sure to mark source and destination as well as which end you are concerned with. | |
| Jan 3, 2018 at 22:51 | comment | added | Benjamin J. | @AliChen: OK. Thanks for the reply. But the USB and RJ45 (Ethernet) shield are connected with each other? If I understand you correctly you would use no cap's, as mentioned by Vinzent, rather you would directly connect shield and ground (but with a cut option)? | |
| Jan 3, 2018 at 22:26 | comment | added | Ale..chenski | Typically, for portable stand-alone devices, people use one solid plane for signal ground and shield. But if your device must be always connected to a PC host to work, shield should be routed separately, it will join the signal ground at PC side. I would recommend to route them separately, but connect them with zero-ohm jumpers (or use a cut option). Then, if you have issues with EMI or ESD, you cut these jumpers and add whatever RLC parts that solve the issue. Geometry and electrical field configurations are fairly complicated in 3D, so you never know. | |
| Jan 3, 2018 at 22:25 | answer | added | Dan Mills | timeline score: 1 | |
| Jan 3, 2018 at 21:23 | comment | added | Benjamin J. | @AliChen: I have read your answers. But I'm still not sure, what I should do. My device is a portable device with a USB, Ethernet and XLR connector. | |
| Jan 3, 2018 at 21:07 | comment | added | Ale..chenski | This is a bit more complicated than Vinzent suggests. All depends on how the device is used, does it have user exposed connectors and hot-plug cables. For some details and considerations, see electronics.stackexchange.com/a/291380/117785 and electronics.stackexchange.com/a/269313/117785 | |
| Jan 3, 2018 at 20:48 | answer | added | user173292 | timeline score: 2 | |
| Jan 3, 2018 at 20:43 | comment | added | user173292 | The shields of the connectors are connected to the screens/shields in the cables, if they are not connected to signal ground then they do not work to shield the signals properly, but they do not have to be dc-connected you can connect the shield(s) to the signal ground with caps | |
| Jan 3, 2018 at 20:39 | review | First posts | |||
| Jan 3, 2018 at 21:40 | |||||
| Jan 3, 2018 at 20:39 | history | asked | Benjamin J. | CC BY-SA 3.0 |