Simplex Mode :
- The communication is unidirectional.
- Only one of the node on the link is able to transmit over the link and the other node is just, a receiver.
- For example, Keyboard, Monitor.
Half Duplex Mode :
- Either of the nodes are able to transmit over the link but only one is able to send or receive at a time.
- For example, Walkie-Talkie.