Just curious as to any background or perspectives around the RJ12 pin assignments used on these 1-Wire boards. Is there any sort of a 1-Wire standard for with RJ plugs that is being followed here?
It would be very economical to use readily-available plugs, cords, and splitters already used for most telecom configurations. However, most such plugs and cords are only 6P2C (using pins 3-4), or 6P4C (using pins 2-5) as the next most-common. However, these boards have the 5V supply on pin 1, which requires an even less common 6P6C plug and cable - while leaving pins 5-6 as no-contact (NC). Why was the 5V supply not put on pin 5? This would have allowed:
- Using 6P2C (2 conductors) for 1-Wire (+ ground) configuration (using "parasite power") - also as-is.
- Using 6P4C (4 conductors) for 1-Wire, ground, and 5V supply.
- This would even seem to follow the "dial light" used on some phones - as described at https://en.wikipedia.org/wiki/Registered_jack#Provisioning_of_power (though this was 6V AC, vs. 5V DC).
As-is, I'm half tempted to use 6P6C connectors (inexpensive enough) with 4-conductor cable, and just offset the wires into the plugs. However, this would make them nearly worthless of any other standard purpose in the future.
I could also jumper pins 1 and 5 together, allowing me to use 6P4C everywhere else. However, I don't want to crimp 1-Wire temperature sensors, etc. into what I'd later find to be a non-standard configuration.
Just curious as to what other background or standards may be involved here. Thanks!