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Maxim > Design Support > Technical Documents > Application Notes > 1-Wire® Devices > APP 2966
Maxim > Design Support > Technical Documents > Application Notes > Memory > APP 2966
Keywords: 1-wire master, transparent protocol, IEEE 1451.4, DS2430A, 1 wire communication
APPLICATION NOTE 2966
Minimal Remote 1-Wire® Master Protocol
Mar 03, 2004
Abstract: Maxim 1-Wire devices are used in remote places where the distance between the device and
the Host may exceed the 1-Wire specifications. This Application Note describes a simple protocol that
can be used between the Host and a remote controller that performs the 1-Wire communication.
Originally created to support the IEEE® 1451.4 A Smart Transducer Interface for Sensors and Actuators
—Mixed-Mode Communication Protocols and Transducer Electronic Data Sheet (TEDS) Formats
standards committee.
Introduction
Maxim 1-Wire devices are used in remote places where the distance between the device and the Host
may exceed the 1-Wire specifications.
In such cases it is useful to be able to have some kind of communication equipment in between the
sensor and the data processing computer which allow data from 1-Wire devices to be efficiently and
transparently transferred, for instance over LAN or WAN networks, in a uniform and consistent way.
The goal with this document is to suggest how this problem can be easily solved in a relative simplified
manner by inserting a transport layer in the driver software, which operates with a uniform frame buffer
format. This extra layer allows different parts of the 1-Wire protocol software to be placed at different
physical locations and in this way extend the versatility of the 1-Wire concept. (Special terms,
commands, or codes are shown in italics for clarity.)This document was originally created to support the
IEEE 1451.4 A Smart Transducer Interface for Sensors and Actuators - Mixed-Mode
Communication Protocols and Transducer Electronic Data Sheet (TEDS) Formats standards
committee.
Scenario
Maxim devices built into remote sensors are, via a 1-Wire bus and a number of individual instruments,
connected to a host application. The instruments are connected together via different communication
lines and are using different communication protocols. The instruments will in this respect act as
communication repeaters, which transfer data transparently between the Host application and devices on
the 1-Wire bus.
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