RS-485和RS-232一样,都是串行通信标准,现在的标准名称是TIA485/EIA-485-A,但是人们会习惯称为RS-485标准,RS-485常用在工业 ...
This whitepaper helps in understanding common design problems and transceiver features developed to solve problems for designs of RS-485/RS-422 devices designs. This could simplify the designer’s task ...
目前常见的串行接口有UART、232、422、485、CAN等,但对于初学者来说,一般很难理解它们的区别以及何时使用它们。 在工业领域的应用中,并非所有的串行接口都是一样的。例如,RS-485串行接口符合高速和工业稳健性的要求,已成为旋转编码器和其它运动控制 ...
在实际应用中需要通信的设备可能是RS-422接口也可能是RS-485接口,那么产品需要具有与RS-422和RS-485接口通信的能力,若单独留出接口位置则会使产品的体积增大,因此RS-422和RS-485共用接口是一种比较可行的减小产品体积的方法。 如图6所示,可以使用 ...
工业现场应用中存在诸多总线应用情况,例如RS-232和RS-485转换且双向隔离、RS-485与RS-422接口共用,本文将为大家介绍这一类应用的方案,不仅简单方便,而且可以提高通信的可靠性。 高性能的RS-232与RS-485双向转换电路 图1右侧所示为RS-232/RS-485总线 ...
在实际的工业、电力、自动化及仪器仪表应用中,RS-485总线标准是使用最广泛的物理层总线设计标准之一,由于其会在恶劣电磁环境下工作,为了确保这些数据端口能够在最终安装环境中正常工作,它们必须符合相关的电磁兼容性(EMC)法规。本文从原理分析到 ...
2) And, is it possible to drive more than 32 unit loads? To answer the first question we look at a typical RS-485 data link shown in Figure 1. Figure 1. Typical RS-485 data link. Observe that, in ...
The most common method for sharing data between devices is via a digital means of communications. Several standard buses implement such methods, with the main differences between them being data rate ...
The RS-485 standard defines a popular and widely used serial data interface and network that’s been in use for over 30 years. It’s found in factories, process control plants, building automation, and ...