A serial port equipment remote control technology of PLC

A serial port equipment remote control technology of PLC newmaker welcome to e hall exhibition hall 3 PLC controller PLC controller programmable controller, PLC controller programming cable. 。 。 1 is described in the application case, the user has a PLC distribution all over the world, users want to pass any computer can be connected to the Internet to access and modify the working state of the PLC. Remote control technology, to avoid the user needs to diagnose trouble, save manpower material resources. Shanghai ZhuoLan technology of networking products including: embedded devices connected to the module, a serial port server, etc. Using ZhuoLan networking equipment for equipment remote monitoring diagram as shown in the figure below. Figure 1 equipment remote monitoring diagram as shown if user equipment is of a similar PLC with a serial port ( DB9) Equipment, will be ZhuoLan to a serial port server to connect to the network; If the user equipment circuit board can be redesigned, then you can choose ZhuoLan networking module, circuit board and integrate it to the user. Two kinds of schemes on the principle is the same. On a remote machine, ZhuoLan technology provides convenient user communications and networking products: 3 ways to 1. ZhuoLan equipment management DLL + VB program. Provide DLL equipment management function library, which can be invoked by a user program, users only need to use the provided open, close, the send, the recv function, communication can be realized. 2. Serial program + virtual serial port driver. Need through MELSOFT development environment such as mitsubishi PLC and PLC communication, some of the Modbus device by sunway software and communication equipment, they are ready-made serial program. Use ZhuoLan virtual serial port driver, can be in network upgrades, still using the serial port. 3. Socket network program: for advanced users, can choose via TCP/IP communications and networking products directly. 2 domain name ( DNS) Domain name system support is the key technology of remote control. The current network access to account for the vast majority of ADSL access network, but if the remote computer through the ADSL network, IP is different each time, must solve the problem of equipment how to know the remote computer IP, the solution is a dynamic domain name system. In ZhuoLan remote control technology, the remote computer through dynamic domain name service at every time of networking can get the world's only domain name, such as yourname. gicp。 com。 ZhuoLan networking product support domain, can use the domain name specifies the destination address of the communication, such as it is set for yourname. gicp。 com。 In this way, no matter when and where the remote computer through the ADSL access network, ZhuoLan networking products can be in the first place and to establish a TCP connection. 3 network address mapping ( NAT) NAT technology is a computer how to solve between two network interconnection technology. For a first-time TCP/IP user, may for IP network ( For example, 192. 168. 0. 200). IP, the network ( For example, 114. 123. 223. 12) Computer how to access the internal network, the network computer is confused. Computer networks outside connection network computer, cannot simply with the computer network IP connection. Here is related to network address mapping NAT technology. NAT technology can make a on ADSL router NAT mapping, the user's network IP mapped to the IP and port networks outside. In the case of the ZhuoLan equipment remote control applications, provides how to use the network address mapping ( NAT) Technology can realize the operation steps of network, due to the limitation of space is not detailed here. 4 the offline recovery mechanism innovation TCP connection abnormal interrupt in remote monitoring equipment is more common than in the local area network (LAN), because in the Internet environment, in the middle of the any a router problem can cause connection interruption. Broken network in remote monitor and control the following problems: if the TCP connection to the client and server, the server due to reasons such as power restart, the client will no longer be able to build connection and the service side. The reason is very simple, because the client think that connection has been established, this led to the server to send data to the client. Heartbeat package technology is the common fault recovery mechanism, but the plan did not write the TCP/IP specifications, original is a heartbeat packet technology there are a lot of negative effects of disputes such as increasing the burden of network, etc. ZhuoLan equipment management DLL library and virtual serial port driver internal integration innovation of offline recovery mechanism, adopt better than the heartbeat package technology, can be in the middle of the server, client, router broken network circumstances, either party quickly restore the connection. 5 total recovery without Internet domain name system, NAT technology, key technologies, such as using ZhuoLan is guaranteed in the realization of remote monitoring of PLC in terms of convenience and stability. 
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