1-Wire

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1-Wire

A half-duplex serial bus from Maxim Integrated Products, Sunnyvale, CA (www.maximintegrated.com). It was originally developed by Dallas Semiconductor, which was acquired by Maxim in 2001. Using one line for data and power, plus ground, 1-Wire is widely used to transfer identification and calibration data from products such as battery packs, printer cartridges, medical sensors, printed circuit boards and cellphone accessories. Transmitting at 16 or 142 Kbps, each 1-Wire device has a unique serial number.

iButtons Use 1-Wire
1-Wire is used to transfer data from Maxim's iButton chips, which are portable tokens used for building access, asset management and other tracking and monitoring applications (see iButton).
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There are no keys - the door is opened by holding an i-button against an i-reader.
Made in the United States, the security cabinets and lockers include a Management Override I-Button digital keypad and backup battery pack.
The company places i-button technology along a prearranged inspection route, and as an assigned store associate walks the route checking for floor hazards, he checks in at the i-button stations to record his progress.
The pod also logs the data with a time/date stamp onto an on-board Dallas I-Button device.
A handheld computer connected to the electronics displays the serial number of the transmitter's I-Button and the tensile load data.
In operation, a vehicle operator must have the properly coded I-button key to start the equipment.
An encrypted signal returned from each coded component instructs the DFMS to accept only a pre-identified programmed I-button key before allowing an engine start.
Each I-button key has a preprogrammed code identifying the proper owner and/or operator.