User manual

1-Wire Application Guide v1.04 Page 10 of 41
Of course, the two main types of network topologies can be combined to achieve
required results. Figure 4 shows an example of a properly connected Bus and
Star network. Note the locations of the 100-Ohm termination resistors, which are
required to minimize noise in the network. Generally, the resistors should be
placed at every branch of the network.
2.3 How to Wire Networks Properly
2.3.1 Types of interconnect cabling
There are several types of cables that can be used for 1-Wire networks. The one
you choose will depend on your application.
2.3.1.1 Telephone (flat) cable
Figure 5 Telephone Cable
This is the kind of cable that is used to plug your telephone into a phone jack. It
normally has 4 wires, but some only have 2 and some have 6 wires. You do not
usually need more than 2 wires for just temperature sensing, but some other
types of sensors will definitely need 3 or more wires, so consider this before
permanently wiring your network.
Telephone cable is not recommended for networks that span more than 50 feet
or so.
The Red and Green wires of telephone cable are recommended for connection to
DQ (red) and Ground (green) on the 1-Wire bus.
Note: if you are using pre-connectorized telephone cable, check that the wires
connecting both connectors are “straight-through”. Most pre-connectorized