The code sections for determining electric elevator top of car clearances can be a bit overwhelming at first encounter - but I am going to explain the procedure in a clear and logical way.at least that's the plan! As you may know, one of the key safety features of a traction elevator is that once the counterweight has landed on it's buffer(s) and it's weight is removed from one end of the suspension means the car will stop moving in the up direction - even if the drive fails to turn off. (Update #20 Top of Car Clearances - Hydraulic Elevators (3.4.4).will be found here.) Meant to be used for bidirectional communication (see forįurther discussion).Update #19 Top of Car Clearances - Counterweighted Elevators (2.4.6) Such technologies were implemented as trade-offsīetween efficiency and reliability because HTTP was not initially Layer to benefit from existing infrastructure (proxies, filtering,Īuthentication). The WebSocket Protocol is designed to supersede existingīidirectional communication technologies that use HTTP as a transport Games, stock tickers, multiuser applications with simultaneousĮditing, user interfaces exposing server-side services in real time, The same technique can be used for a variety of web applications: Combined with the WebSocket API, it provides anĪlternative to HTTP polling for two-way communication from a web page Outgoing connections to the incoming connection to track replies.Ī simpler solution would be to use a single TCP connection for O The client-side script is forced to maintain a mapping from the O The wire protocol has a high overhead, with each client-to-server O The server is forced to use a number of different underlying TCPĬonnections for each client: one for sending information to theĬlient and a new one for each incoming message. Server for updates while sending upstream notifications as distinct Historically, creating web applications that need bidirectionalĬommunication between a client and a server (e.g., instant messagingĪnd gaming applications) has required an abuse of HTTP to poll the RFC 6455 The WebSocket Protocol December 2011 1.
Using the WebSocket Protocol from Other Specifications.
Registration of the "WebSocket" HTTP Upgrade Keyword. Connection Confidentiality and Integrity. RFC 6455 The WebSocket Protocol December 2011 7.1.6.
The WebSocket Closing Handshake is Started. Supporting Multiple Versions of WebSocket Protocol. Collected ABNF for New Header Fields Used in Handshake. Subprotocols Using the WebSocket Protocol. The Trust Legal Provisions and are provided without warranty asġ.
Include Simplified BSD License text as described in Section 4.e of RFC 6455 The WebSocket Protocol December 2011 Code Components extracted from this document mustįette & Melnikov Standards Track Please review these documentsĬarefully, as they describe your rights and restrictions with respect This document is subject to BCP 78 and the IETF Trust's Legal
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Internet Engineering Steering Group (IESG). Received public review and has been approved for publication by the It represents the consensus of the IETF community. This document is a product of the Internet Engineering Task Force This is an Internet Standards Track document. Not rely on opening multiple HTTP connections (e.g., using This technology is to provide a mechanism for browser-basedĪpplications that need two-way communication with servers that does The protocol consists of an opening handshakeįollowed by basic message framing, layered over TCP. Model used for this is the origin-based security model commonly usedīy web browsers. That has opted-in to communications from that code. Running untrusted code in a controlled environment to a remote host The WebSocket Protocol enables two-way communication between a client Internet Engineering Task Force (IETF) I.