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[164]Периодическая ошибка частотника 名前:Deltatppqbq 2018/04/07 22時35分04秒

where a primary computer Node 0 in the figure has control of the network and grants the secondary computers Nodes 1 and higher permission to transmit. One pair of wires connects Node 0’s driver to all of the secondary nodes’ receivers. In the other direction, another pair of wires connects all of the secondary nodes’ 91 Chapter 6 5V TTL/CMOS + 5 V i? 5V TTL/CMOS SERIAL A 8 1 /120 _5 Y <P SERIAL OUT 2 , В 7 l ~ 6 Z 3 1N SERIAL OUT 4> Y 5 8 A SERIAL 3 z 6 S 7 В 2 —I 120 Г 1 N "U" AN SN75I79B RS-485 DIFFERENTIAL DR I VER/RECEIVER SN75I79B RS-485 DIFFERENTIAL DR IVER/RECEIVER Figure 6-7: A full-duplex RS-485 circuit provides a data path for each direction.. drivers to Node 0’s receiver. All of the secondary nodes monitor messages from Node 0. The node being addressed replies on the other pair of wires. The advantage is that the secondary nodes don’t see the other nodes’ replies. With a single data path, all of the secondary nodes receive all of the network traffic. Half Duplex Many RS-485 circuits are half-duplex, where multiple drivers and receivers share a signal path. The interfaces form a serial network, and each computer with an RS-485 interface is a node in the network. Networks typically use half duplex interfaces and allow one node at a time to transmit. Links with just two devices can be half duplex as well. Microcontrollers that allow configuring a port bit as input or output can send and receive on a single port bit, reconfiguring the bit as needed. You might use this approach if you need to use the fewest number of port pins or wires possible. If you need to transmit in just one direction simplex , you of course need only one data path. NODE 0 NODE 1 NODE 2 NODE 3 Figure 6-8: In this full-duplex, multi-node circuit, Node 0 transmits to all other nodes on one line and receives from all other nodes on the other line. 92 Inside RS-485 Figure 6-9 shows a half-duplex network that uses an SN75176B differential bus transce prom-electric.ru