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Ground wire in hobby board interface RJ45 with hub-switch


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#1 Thomas Parvais

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Posted 21 December 2011 - 09:46 AM

Hello

Can we bind together all GND wires of rJ45 1-wire interface ?
and use only 4 wires:

1 wire for general GND
1 wire for DQ
1 wire for +5V
1 wire for +12V
Because I discover when I bind all GND together (pin 1, 3, 5 & 8), the power supply led switches off.... This is strange !!

Thank you

Edited by Thomas Parvais, 23 December 2011 - 03:18 AM.


#2 Thomas Parvais

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Posted 23 December 2011 - 03:43 AM

Hello

Can we bind together all GND wires of rJ45 1-wire interface ?
and use only 4 wires:

1 wire for general GND
1 wire for DQ
1 wire for +5V
1 wire for +12V
Because I discover when I bind all GND together (pin 1, 3, 5 & 8), the power supply led switches off.... This is strange !!

Thank you


I did a mistake in the rJ45 plug... 2 wires inverted.... fixed !!!

#3 BuGless

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Posted 08 January 2012 - 05:52 AM

In general, you should be able to join them, however, try to do it in such a way that currents drawn from any of the other wires are returned on the accompanying ground and not on one of the other grounds. Making sure that the currents are "symmetric" will make sure that you have/generate less electromagnetic (radio) interference.




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