A Activity diagram used in UML 6/9 and SysML B Bachman diagram Booch used in software engineering Block diagram Block Definition Diagram BDD used in SysML C Carroll diagram Cartogram Catalytic cycle Chemical equation Curly arrow diagram Category theory diagrams Cause-and-effect diagram Chord diagram Circuit diagram Class diagram from UML 1/9 Collaboration diagram from UML 2.0 Communication diagram from UML 2.0 Commutative diagram Comparison diagram Component diagram from UML 3/9 Composite structure diagram from UML 2.0 Concept map Constellation diagram Context diagram Control flow diagram Contour diagram Cordier diagram Cross functional flowchart D Data model diagram Data flow diagram Data structure diagram Dendrogram Dependency diagram Deployment diagram from UML 9/9 Dot and cross diagram Double bubble map used in education Drakon-chart E Entity-Relationship diagram ERD Event-driven process chain Euler diagram Eye diagram a diagram of a received telecommunications signal Express-G Extended Functional Flow Block Diagram EFFBD F Family tree Feynman diagram Flow chart Flow process chart Flow diagram Fusion diagram Free body diagram G Gantt chart shows the timing of tasks or activities used in project management Grotrian diagram Goodman diagram shows the fatigue data example: for a wind turbine blades H Hasse diagram HIPO diagram I Internal Block Diagram IBD used in SysML IDEF0 IDEF1 entity relations Interaction overview diagram from UML Ishikawa diagram J Jackson diagram K Karnaugh map Kinematic diagram L Ladder diagram Line of balance Link grammar diagram M Martin ERD Message Sequence Chart Mind map used for learning, brainstorming, memory, visual thinking and problem solving Minkowski spacetime diagram Molecular orbital diagram N N2 Nassi Shneiderman diagram or structogram a representation for structured programming Nomogram Network diagram O Object diagram from UML 2/9 Organigram Onion diagram also known as "stacked Venn diagram" P Package diagram from UML 4/9 and SysML Parametric diagram from SysML PERT Petri net shows the structure of a distributed system as a directed bipartite graph with annotations Phylogenetic tree - represents a phylogeny evolutionary relationships among groups of organisms Piping and instrumentation diagram P&ID Phase diagram used to present solid/liquid/gas information Plant Diagram Pressure volume diagram used to analyse engines Pourbaix diagram Process flow diagram or PFD used in chemical engineering Program structure diagram R Radar chart Radial Diagram Requirement Diagram Used in SysML Rich Picture R-diagram Routing diagram S Sankey diagram represents material, energy or cost flows with quantity proportional arrows in a process network. Sentence diagram represents the grammatical structure of a natural language sentence. Sequence diagram from UML 8/9 and SysML SDL/GR diagram Specification and Description Language. SDL is a formal language used in computer science. Smith chart Spider chart Spray diagram SSADM Structured Systems Analysis and Design Methodology used in software engineering Star chart/Celestial sphere State diagram are used for state machines in software engineering from UML 7/9 Swim lane Syntax diagram used in software engineering to represent a context-free grammar Systems Biology Graphical Notation a graphical notation used in diagrams of biochemical and cellular processes studied in Systems biology System context diagram System structure Systematic layout planning T Timing Diagram: Digital Timing Diagram Timing Diagram: UML 2.0 TQM Diagram Treemap U UML diagram Unified Modeling Language used in software engineering Use case diagram from UML 5/9 and SysML V Value Stream Mapping Venn diagram Voronoi diagram W Warnier-Orr Williot diagram Y Yourdon-Coad see Edward Yourdon, used in software engineering
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。 在工业控制上，RS485总线因其接口简单，组网方便，传输距离远等特点得到广泛应用。
RS485介绍 定义： RS485是一种高性能、多点、半双工、差分串行通信标准，可用于在多个设备之间进行长距离通信。 特点：RS485通常使用差分信号进行通信，即每根通信线路上同时传输正负两个信号，相对于RS232具有更好的抗干扰能力。
rs232直接用于工业通信的不多，rs485较多。 因为rs485是差分信号，干扰可以互相抵消，相比较而言，rs485波形不容易变形，抗干扰性能更好。 但是为什么我们在控制器上总能看到rs232身影？ 这时候的rs232更多是为了辅助调试用的。
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? Thanks in advance for your help.
RS485：RS485接口在总线上允许连接多达128个收发器，具有多站通讯能力，用户可以方便地建立设备网络。 通过单一的RS485接口，可以实现多个设备之间的通信。 五、RS232与RS485通讯线的差异 RS232：RS232接口可以使用三芯双绞线、三芯屏蔽线等不同类型的通讯线。
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 identification except A, B (example: Tx , Tx or D , D ).
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备的技术要求。 5、RS485转PROFINET（PROFINET转RS485）网关相关参数：
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、RS485、RS422、TTL这些名词，有时候会说不清、道不明其中的区别，这篇文章，系统地分析和梳理一下这些名词地区别，以后碰到 ...
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 standards are compatible? Is it safe to connect my usb cable converter or the RS232 to TLL module for long periods of time and not endanger the scale unit?
1、概述 在设备控制的调试过程中，经常会遇到RS485和RS422通讯的调试或相互转换，其实质是接线方式的不同。通常RS485和RS422的相互转换需要区分RS485是半双工还是全双工。
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