RS485通讯的工作原理是什么？ - 知乎
RS485通讯接口分为两种，一种是两线制，另一种是四线制。 两线制的是半双工通讯方式，四线制是全双工通讯方式。 RS485通讯接口，抗干扰能力强，抗噪声干扰性好。 在工业控制 …
Compatibility between RS232 and RS485 | Forum for Electronics
Sep 23, 2017 · I red that RS485 works with differential voltages and can tolerate lower voltages than RS232. My question is: Is the label RS485 wrong (since it worked as RS232) or the two …
RJ45接口如何使用RS485通讯？ - 知乎
4、RS485转PROFINET（PROFINET转RS485）总线桥网桥可用于一对多集成RS485自由协议设备，满足各种串口设备仪表连接PROFINET网络，实现PROFINET控制器监控串口自由协议设 …
Compatibilities between RS-485 and RS-422 - Forum for Electronics
Mar 22, 2002 · half duplex transmission protocol for rs485 Is it possible to use a RS-485 interface with a device which uses RS-422? In other words, is RS-485 fully compatible with RS-422? …
Confusion with RS485 data Tx+, Tx-, Rx+, Rx-, A, B, Y, Z
May 16, 2008 · The RS485 is a bidirectional communication so there is no meaning to use Tx+ or Tx- alone & the best notation is A, B. But unfortunately here i have to use different …
Creating a TCP/IP network over RS-485 bus | Forum for Electronics
Jul 31, 2004 · Re: TCP/IP over RS-485? If you are using RS-485 in point-to-point mode, U can use PPP or SLIP, it is a differential version of asynchronous communication as Buddy talked. …
rs485通讯，modbus协议，数据帧modbus格式，rs485格式比 …
rs485通讯，modbus协议，数据帧modbus格式，rs485格式比如8e1，其中起什么作用？ 使用rs485通讯，modbus 协议，数据帧遵循modbus格式，那rs485的通讯格式比如8e1，在其中起 …
为什么去掉RS485匹配电阻后通讯恢复正常？ - 知乎
为什么去掉RS485匹配电阻后通讯恢复正常？ 昨天遇到一个问题，变电所全站停电（高低压全停，是为了验证支援供电的功能），送电后两个负荷开关柜通讯中断。
How to communicate with RS485 via Windows? | Forum for …
Jun 27, 2005 · Re: RS485 and PC Hi, If it is appearing as a COM port under Windows, you will be able to communicate through it as a COM port. But you will need a matching RS485 device …
uart、串口、COM口、USB口，ttl，rs232,rs485这几个到底是啥关 …
本文为作者原创文章，原创不易，如需转载请附上本号链接或者联系作者 嵌入式开发人员不论是看技术文档，还是在日常的交流中，经常会碰到串口、COM、UART、USART、RS232 …