4线（2对）是双工通信，2线（1对）则为半双工通信。全双工（4线），半双工（2线）。根据你不同的的设备选择不同的通信方式。这个一般在设备接口定义里面都有。类似于TX- RX- TX+ RX +，这样子的。百度百科里有的4线 点对点全双工2线 点对多半双工
1、串行数据标准的基本概述及种类 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。
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...
Questions: Claudio J. OsorioSays: See also: http://jap.hu/electronic/pbus.htmlRS485 master and slave code using PIC hardware UART + file: /Techref/microchip/rs485.htm,NaNKB (2 imgs) in 0.061s is NaNKBps, updated: 2010/3/25 11:10, local time: 2025/4/8 11:05,owner:JMN-EFP-78...
源:无源RS232转RS485 RS232 -485转换器主要包括了电源.232电平转换.485电路三部分.本电路的232电平转换电路采用了NIH232或者也可以直接使用MAX232集成电路,485电路采用了MAX485集成电路.为了使用方便,电源部分设计成无源方式,整个电路的供电直接从PC机的RS232接口中的DTR(4脚)和 RTS(7脚)窃取.PC串口每根线可以提供...
Solved: Hi All, I want to use UART7 and UART8 on iMX6UL for RS485. The schematic of RS485 is as below. I want to use DE/RE_485_2 to control the
2. Copy the rp2-pico-20210418-v1.15.uf2 file in the python directory to the recognized removable disk (RPI-RP2). 3. Open Thonny IDE (Note: Use the latest version of Thonny, otherwise there is no Pico support package, the latest version under Windows is v3.3.3). 4. Click Tools->...
2: SYSTEM CONFIGURATION 13 NETWORK TOPOLOGIES 13 TWO WIRE OR FOUR WIRE SYSTEMS 13 TERMINATION 16 BIASING AN RS-485 NETWORK 17 EXTENDING THE SPECIFICATION 19 CHAPTER 3: SELECTING RS-422 AND RS-485 CABLING 20 NUMBER OF CONDUCTORS 20 SHIELDING 20 CABLE CHARACTERISTICS 20 CHAPTER 4: TRANSIENT ...
RoHS 2-Wire Intelligent Smart RS485 Hart Piezoresistive Water Tank Pressure Sensor, Find Details and Price about Water Tank Pressure Sensor Digital Pressure Transmitter from RoHS 2-Wire Intelligent Smart RS485 Hart Piezoresistive Water Tank Pressure Sens
Up Interface: 1-Port RS-485 and 1-Port RS-232 (3 wire) Down Interface: 4-Ports RS-485 Isolation voltage: Isolation voltage 1.5KV,600W Surge protection RS-232 Trans distance: 10 meters (Max) RS-485 Trans distance: 1000 meters (Max) Data rate: 300 to 115200 Bps Interface protection: ...