Although Tx and Rx share the same frequency, Tx can only occur in one way simultaneously.įull Duplex allows transmission in both directions and for the same channel simultaneously, using two different frequencies one for Tx and another for Rx. Half Duplex allows transmission in both directions. The Simplex is a type of unidirectional transmission in which the Rx cannot respond to the Rx. There are three types of relations between the master and the slave from the point of view of the Tx and Rx (Transmitter and Reciever) the Simplex, the Full Duplex and the Half Duplex. There are many different communications but, in this one, the master is typically located in the center along with the RS-485 cable set, and two slaves are located at the physical end of the wires, making the terminations. Usually, when we talk about a master-slave arrangement, the master device initiates all the communication activity, providing itself the bias.
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