Several principles of DN work

Serial access Nowadays computer users have become accustomed to network communications, but we should know that the serial port has been the main means of communication between devices for many years. Many industrial and medical devices are mass-produced before Ethernet is widely used. RS232 is the only device management and communication method. A computer or dumb terminal is required to communicate with it.

In the early days, remote management required long cables to connect two 232 ports. The transmission rate was very slow, but after a certain distance, the RS232 signal was powerless. RS422 was often used to enhance the transmission distance, and the distance was longer than the Modem. Therefore, the reliability and sharing of data cannot be guaranteed.

The financial industry first thought of overcoming this problem. In the early 1990s, the development of fast Ethernet technology, optical area network technology and TCP/IP protocol replaced the original point-to-point simple communication method. Terminal servers, HUBs, and routers replace multi-user cards, modems, and multiplexers. Such networks are fast, flexible, highly reliable, and highly compatible.

The terminal server enables ordinary dumb terminals to enjoy network services. Like printers, modems, converters, and other serial devices can access the network in this way. Any host on the network can monitor and use these devices.

Early terminal servers were very large and expensive, and sometimes some auxiliary equipment was installed to work. Now, Zhongxinxin Company adopts the latest technology and greatly reduces its size. The latest single-serial DN can be very compact, even smaller than a matchbox, so that the serial device can access the network with a small cost.

We can find out how convenient it is to control or monitor serial devices after using a DN. There are no long cables, no dedicated modems, and no multi-user cards. After the serial device is connected to the network, these serial devices can be managed on the intranet or the Internet.

Some devices require specialized computers to perform parametric equipment, collect data, process it, and report it to other computers. Can DN help these devices?
The answer is yes, yes.
As long as the serial port redirection software is used, the access to the serial port is directed to the serial port of the remote DN, so that the software reads and writes the local serial port. In fact, the remote serial port is read and written through the network.

Even if you do not use serial port redirection software, you can connect back-to-back through two DNs to form a transparent channel through the network. That is, the serial port extends through the network.

The DN can connect serial devices to the network. Why do you want to do this? The reason is as follows:

·Easy installation and maintenance
Networking is becoming more and more popular in factories, shops, and schools. No matter where you go, you can easily access the network port. Once your device is connected to these ports, you can access it through the local area network or the Internet.

·Can be managed from anywhere
Now network administrators have many tools to maintain the network, SNMP (Simple Network Management Protocol) is a TCP/IP-based network management standard, HP (HPOpenview) and SUN (SunNetmanager) are popular network management software, DN supports SNMP, for some through the serial port The device that provides the management menu can see the menu as long as the serial port is Telnet to the DN.

Reliable network access
Due to the multiple network management methods, the reliability of the LAN can be guaranteed.

Very low maintenance costs
Thanks to reliable remote access, network management can completely rely on automation to reduce training costs for network management personnel.
The low price of DN itself makes the networking cost very low.

PVC,know as polyvinyl chloride is one of the mostly common used materials in plastic field.

PVC profiles also called uPVC profile or PVC-U profile are the based materials for making one 

uPVC window and doors.Through high speed mixer,hot mold extrusion,cutting into customized

 length,then package by plastic bags. Finally could get pieces of uPVC frames,PVC sash and Double Glazing beads.

The most significant properties of Polyvinyl Chloride (PVC) 

Density: PVC is very dense compared to most plastics.
Economics: PVC is readily available and cheap.
Hardness: Rigid PVC is very hard.
Strength: Rigid PVC has extremely good tensile strength.

PVC Profile

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