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The standard RS-485 cable and its parametersįor the daisy chain topology, the use of termination resistors with a 120 Ω value is required at each end of the network to minimize reflections. It is also recommended that shielded twisted-pair cables wire an RS-485 connection because it increases differential pair immunity from electromagnetic effects and noise. This is because RS-485 is a high-speed transmission line and is significantly affected by signal reflections. The other topologies, like Star, T-Drop, or Ring, are not recommended. The best layout type for connecting devices using the RS-485 protocol is a daisy chain. RS-485 data rate and cable length dependency The figure below shows the relationship between the transmission rate and transmission distance.
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At a full speed of 10 Mbps, the RS-485 can only operate over about 12 meters, while distances of 1200 meters can be achieved at 100 kbps. The greater the speed, the fewer nodes you can connect, and also, the maximum distance over which you can communicate will decrease. While you can theoretically connect up to 32 devices (or even more by using an RS-485 repeater), the actual number of nodes will depend on the chosen communication speed or baud rate. The RS-485 differential pair characteristic impedance is 120 Ω.
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The 2-Wire configuration is generally more popular however, the configuration you may need to employ will depend on the devices you are using and the drivers they have. The main difference between 2-Wire and 4-Wire is that the 2-Wire configuration can at any one time either receive or transmit, while the 4-Wire configuration can simultaneously receive and transmit. In the 4-Wire configuration, the master transmitter is connected to the slave receiver connections, while the master receiver is connected to the slave transmitter connections.
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The second configuration uses 4-Wire and is also known as a Full-Duplex configuration, which uses two differential pairs: labeled TR (transmit) and RX (Receive), along with a ground reference, as shown in the figure below. The first one is RS-485 2-Wire, also known as a Half-Duplex configuration, that uses one differential pair transmission line with a ground reference, as shown in the figure below. The RS-485 protocol standard allows up to 32 drivers in one system, supporting communications over distances of up to 1200 meters, and can keep baud rates from 110 Baud to 115200 Baud.Īdherence to the RS-485 protocol has several transmission line configurations.
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RS-485 is a successor to the RS-422, which also uses a balanced differential pair, but only allows one driver per system. It is a multi-point system standard that uses a balanced differential pair data transmission line.
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It defines the electrical characteristics of the transmitter and receiver drivers of serial communication systems. It is an electrical protocol standard (rather than a protocol), which was approved in 1983. RS-485 (the RS standing for Recommended Standard) is also known as TIA-485 (Telecommunications Industry Standard) or EIA-485 (Electronics Industries Alliance). In this article, we will be looking at the popular RS-485 protocol standard. We aim to provide helpful information that you can cross-reference next time you need to choose the best serial communication bus for your design. After this series, we will review and compare their advantages and disadvantages. These will cover a few of the more popular protocols and standards in use today. This article is from a series of articles looking at some of the popular Serial Communication Protocols.