Serial communication9/6/2023 ![]() ![]() As such, there is a pin difference between the two sides. Each one has a transmit signal that is connected to the receive signal on the other end. Cable lengths of 30 feet are common, and cables of over 200 feet can be attained with low-capacitance cable.Īn RS-232 bus is an unbalanced bus capable of full-duplex communication between two receiver/transmitter pairs, named data terminal equipment (DTE) and data communication equipment (DCE). While not specifically called out in the specification, speeds of greater than 115.2Kbps are possible, provided that connections are short and proper grounding is used. A point-to-point interface, RS-232 is capable of moderate distances at speeds up to 20Kbps. RS-232 is a complete standard, not only including electrical characteristics, but physical and mechanical characteristics as well, such as connection hardware, pin-outs, and signal names. ![]() TIA/EIA-232-F (typically referred to as RS-232) is a common interface that can be found on almost every personal computer. Types of communication protocols RS-232 protocol This is different from a multi-drop interface as it allows bidirectional communication over the same set of wires. Multi-point describes a bus in which there are more than two peer transceivers.The term multi-drop describes an interface in which there are several receivers and one transmitter.Peer interfaces are most often asynchronous. Point-to-point or peer interfaces are where two devices have a peer relation to each other there are no masters or slaves.These buses must have an arbitration scheme that can settle conflicts when more than one master wants to control the bus at the same time. A multi-master bus is a master/slave bus that may have more than one master.Master/slave buses are usually synchronous, as the master often supplies the timing clock for data being sent along in both directions. Master/slave describes a bus where one device is the master and others are slaves.Half-duplex is when data can be sent or received, but not at the same time. Full-duplex means data can be sent and received simultaneously.A synchronous bus sends data with a timing clock. ![]()
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