ISO1430DWRG4 datasheet(29/49 Pages) TI2

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10 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification,

and TI does not warrant its accuracy or completeness. TI’s customers are responsible for

determining suitability of components for their purposes, as well as validating and testing their design

implementation to confirm system functionality.

10.1 Application Information

The ISO14xx devices are designed for bidirectional data transfer on multipoint RS-485 networks. The design of

each RS-485 node in the network requires an ISO14xx device and an isolated power supply as shown in Figure

10-3.

An RS-485 bus has multiple transceivers that connect in parallel to a bus cable. Both cable ends are terminated

with a termination resistor, RT, to remove line reflections. The value of RT matches the characteristic impedance,

Z0, of the cable. This method, known as parallel termination, lets higher data rates be used over a longer cable

length.

Full-duplex implementation, as shown in Figure 10-1, requires two signal pairs (four wires). Full-duplex

implementation lets each node to transmit data on one pair while simultaneously receiving data on the other

pair. In half-duplex implementation, as shown in Figure 10-2, the driver and receiver enable pins let any node at

any given moment be configured in either transmit or receive mode which decreases cable requirements.

ISO1412

Master

ISO1412

Slave

Figure 10-1. Typical RS-485 Network With Full-Duplex Isolated Transceivers

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ISO1450, ISO1452, ISO1410, ISO1412, ISO1430, ISO1432

SLLSF22H – APRIL 2018 – REVISED JUNE 2024

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ISO1430DWRG4 Datasheet(PDF) 29 Page - Texas Instruments