The ISOW14x2 devices are designed for bidirectional data transfer on multipoint RS-485 networks. An RS-485 bus has multiple transceivers that connect in parallel to a bus cable. Both cable ends are terminated with a termination resistor, R_T, to remove line reflections. The value of R_T 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 shown in Figure 9-1 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.

Figure 11-1 Typical RS-485 network with Full-duplex Isolated transceivers

Figure 9-2 below, shows ISOW14x2 devices used in half duplex configuration. Driver outputs Y and Z are shorted to A and B respectively. This reduces overall cabling requirements. Also DE/RE are shorted to each other, and at a time, any node acts as either a driver or a receiver. Split termination is also shown in this configuration which helps to boost network immunity in noisy environments by providing common-mode noise filtering and also reduces radiated emissions by providing low impedance path to earth to the bus common mode excursions.

Figure 11-2 Typical RS-485 Network With Half-Duplex Isolated Transceivers