Without defining the return path properties, the question can't be answered. Actually, a single line electrical circuit doesn't exist. You may ignore the return path, but it's present anyway.we had to consider a SINGLE comms line for the serial data
FvM said:Actually, a single line electrical circuit doesn't exist. You may ignore the return path, but it's present anyway.
Don't confuse data flow and electrical current flow respectively voltage reference. Also the said "one wire" protocol depends on a common ground return path (and the protocol is bidirectional, by the way).Thats why it is one wire and unidirectional, and there is no return.
FvM said:Don't confuse data flow and electrical current flow respectively voltage reference. Also the said "one wire" protocol depends on a common ground return path (and the protocol is bidirectional, by the way).Thats why it is one wire and unidirectional, and there is no return.
FvM said:This may sound completely obvious, but I have learned that it isn't in edaboard discussions.
Such kind on device is needed not for communication (data transfert) but to send commands or a "consigne" to a control system (very small information to send). Thats why it is one wire and unidirectional, and there is no return .
FvM said:you apparently mean a dedicated return wire, that can be omitted if a common ground is present.
Regarding the discussed filter means, your first RC solution isn't that bad at all
Because of the "long distance" return path, there's no clear difference between common mode and differential interferences in this case. No common mode choke can help against it.
Well you are right with the twisted pair as in single wire there would be huge problem of CM noise.
for filtering i would prefer to use ferrite bead along with the capacitor if twisted pair is not be used
Well you are right with the twisted pair as in single wire there would be huge problem of CM noise.
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