ZHCSI82E May 2018 – May 2019 THVD1410 , THVD1450 , THVD1451 , THVD1452
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An RS-485 bus consists of multiple transceivers connecting in parallel to a bus cable. To eliminate line reflections, each cable end is terminated with a termination resistor, RT, whose value matches the characteristic impedance, Z0, of the cable. This method, known as parallel termination, generally allows for higher data rates over longer cable length.
Figure 31. Typical RS-485 Network With Half-Duplex Transceivers
Figure 32. Typical RS-485 Network With Full-Duplex Transceivers