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1-wire parasitic mode - Printable Version

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1-wire parasitic mode - Bobby - 24.07.2017

Hi. 
Do logicmachine support parasite mode? Do i  need a resistor for this? 

Bobby

RE: 1-wire parasitic mode - admin - 24.07.2017

It is supported, no external resistor is required. Still, it is strongly recommended to use additional +5V supply, otherwise readings may fail due with larger cable lengths and/or a larger number of 1-Wire slaves.

RE: 1-wire parasitic mode - Bobby - 24.07.2017

(24.07.2017, 08:49)admin Wrote: It is supported, no external resistor is required. Still, it is strongly recommended to use additional +5V supply, otherwise readings may fail due with larger cable lengths and/or a larger number of 1-Wire slaves.

Hi!

Ok, my tought was to use the 2 extra wires in the KNX cable.
tried it With GND and DQ, but did only get devices into lm, but no data. Sad

RE: 1-wire parasitic mode - Bobby - 24.07.2017

(24.07.2017, 09:00)Bobby Wrote:
(24.07.2017, 08:49)admin Wrote: It is supported, no external resistor is required. Still, it is strongly recommended to use additional +5V supply, otherwise readings may fail due with larger cable lengths and/or a larger number of 1-Wire slaves.

Hi!

Ok, my tought was to use the 2 extra wires in the KNX cable.
tried it With GND and DQ, but did only get devices into lm, but no data. Sad

is it maybe possible to use the earth screen for GND, and use the 2 extras for +V and DQ?
any other suggestions? if not i have to rewire the house....

RE: 1-wire parasitic mode - admin - 24.07.2017

You can try, but first measure the resistance of the shield between LM and slave devices. The lower the better.

RE: 1-wire parasitic mode - zoltan - 27.07.2017

Keep in mind that the screen is there to keep things out! If you connect it to GND it will eventually provide enough energy to destroy something.