USB / RJ11 adapter

One wire (tm) is a standard for communicating with a microcontroller using a single wire (plus ground). Commonly used by Dallas iButton-based temperature sensors, or device tags.

To the OP, you could use a cheap Arduino dev board, programmed to communicate using the one wire protocol. Depends on whether you are constrained by the software that drives your iButton, and if you are able to program an Arduino.

https://playground.arduino.cc/Learning/OneWire
 
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