4线（2对）是双工通信，2线（1对）则为半双工通信。
將2線設備的發送引脚(TXD)連接到TXD-和RXD-。將設備的接收引腳(RXD)連接到TXD+和RXD+。請查閱與參考設備的用戶手冊。 通過參考Setting the Transceiver Wire Mode of Ports on NI Serial Board,將COM端口配置為2-wire Auto模式進行通訊。 使用VISA交互式控件測試通訊。請參閱設備的用戶手冊以獲取受支援的命令。
This configuration is also must have driver/receiver enable pins enabling only one driver known as a 4-wire RS-485 network connected in a multipoint to send data at a time. See Figure 3 for a half-duplex bus config- master/slave configuration. Full-duplex RS-485 allows for uration. This...
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2、串行通信和并行通信 3、异步串行通信 4、串行数据规则(数据位、同步位、奇偶位、波特率) 5、三种通信方式——单工、半双工和双工通信 6、接口英文缩写具体含义(RXD、TXD、DTR、DSR、CTS等等) 7、RS232的定义和历史、电气特性、物理特性、数据传输速率、连接方式、应用场景等等。
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It is generally accepted that RS-485 can be used with data rates up to 10 Mbit/s[a] or, at lower speeds, distances up to 1,200 m (4,000 ft).[2] As a rule of thumb, the speed in bit/s multiplied by the length in metres should not exceed 108. Thus a 50 meter cable should...
RS-485 Loopback (Port to Port) Test 2 Wire AUTO MODE ONLY Overview Programmatically configure loopback test. Functional Description In order to perform a RS-485 two wire loopback in AUTO mode, you need to have two separate ports to communicate between. In this example, the two wire AUTO ...