The hottest Ethernet Serial port converter enters

  • Detail

Ethernet Serial port converter enters the era of wireless WiFi

if we predict that computers will be replaced by tablets in ten years, RJ-45 wired Ethernet interface will certainly disappear. Since the disappearance of Ethernet port Q: in terms of the development of an industry, people's demand for WiFi wireless network has changed from standby to the only option

The network access ability created by WiFi has far exceeded that of wired network, and it has been within the reach of the past, and even has the potential to replace it. In just a few years, the number of users accessing the Internet through WiFi has exceeded that of wired networks. Nowadays, wireless networks are covering our lives in homes, companies, cafes, airports and squares. Maybe you are reading this article through your WiFi connected computer

the shipment of tablet computers this year will exceed 50million. This means that users with such terminal devices will completely rely on wireless means to connect to Internet and networking applications, and WiFi access will become the first choice for users

wifi: the formation of wireless local area standard

from the perspective of the development history of WLAN (wireless local area) technology, we can see the formation process of WiFi

the wireless network we use today is not a technology developed in recent ten years. The history of wireless network can be traced back to 50 years ago, when the U.S. military first began to use wireless signals to transmit data, and applied high-strength encryption technology. Later, many researchers got inspiration from this technology

In 1971, researchers at the University of Hawaii created the first wireless communication network called alohnet based on packet technology, which can be regarded as the early wireless local area network (WLAN, now WiFi). Although the earliest WLAN included only seven computers, it could span four Hawaiian Islands, and thus the wireless local area network was born

in the mid-1970s, the development prospect of wireless local area network gradually attracted the attention of the commercial market and was vigorously developed. The change of market demand began to officially become the driving force leading the evolution of this kind of technology. After entering the 1980s, Ethernet local area applications have developed rapidly, but its own shortcomings have become increasingly prominent, while the advantages of wireless technology have been highlighted. Many manufacturers from the PC field began to pay attention to wireless networks. Driven by the market, wireless networks began to appear on the stage of civil networks

when there is a large-scale demand in the market, standards will be born. In the late 1980s and early 1990s, WLAN architecture was mainly developed based on IEEE802.3 standard (that is, wired Ethernet standard). However, due to the lack of technology, the products developed in the early stage are vulnerable to other microwave noise interference, unstable performance, low transmission rate, difficult to upgrade and other problems, and the products of different manufacturers are incompatible with each other. These problems have led to the wireless network has been used as a supplement to wired Ethernet, and the application and development of wireless network have been restricted to a certain extent

a truly landmark change in the history of wireless local area network development was the introduction of IEEE802.11 standard in June, 1997. The 802.11 standard puts forward the working modes of point-to-multipoint access and point-to-point relay, which truly provides an efficient and high-speed solution that enables wireless networks to replace wired networks. This standard has laid the foundation for the development of wireless local area technology. In the Warring States period, when various technologies were interwoven, various wireless local area technologies were blooming, and WL fell by 5.49% year-on-year; 10.1921 million tons of an, Bluetooth, HomeRF, UWB, etc. are imported, but only IEEE802.11 series WLAN is the most widely used. WiFi is a technology that can connect personal computers, handheld devices (such as PDA, etc.) and other terminals to each other wirelessly. WiFi is a brand of wireless communication technology, which is owned by WiFi alliance. The purpose is to improve the interoperability between wireless products based on IEEE 802.11 standard. At present, most people will equate WiFi with IEEE 802.11, and even equate WiFi with WLAN wireless local area network

in September 1999, the official introduction of 802.11b standard promoted the new process of wireless application. It not only provided a faster and more stable access method, but also the cost was not high, which made it possible for WiFi technology to be widely used in homes and enterprises. However, its biggest disadvantage is that it can not bear the heavy responsibility of large-capacity data transmission, so the IEEE 802.11a standard, which can achieve faster transmission speed, came into being. However, due to its own shortcomings, this standard has been regarded as a supplement to 802.11b

in September 2003, the 802.11g standard was officially approved, making the application of wireless local area networks enter a new era. After absorbing the advantages of 11b and 11a standards, 802.11g also overcomes the shortcomings of previous standards and achieves a breakthrough of up to 108m

in 2009, 802.11n standard, which can make wireless local area network reach the Ethernet performance level, was introduced. It realizes high bandwidth and high quality WLAN services. In terms of transmission rate, 802.11n can increase the transmission rate of WLAN to 600mbps. Thanks to the MIMO OFDM technology that combines MIMO (multiple input multiple output) and OFDM (orthogonal frequency division multiplexing) technology, the transmission quality and transmission rate of wireless local area have been greatly improved. By using smart antenna technology, WLAN users can receive stable signals and greatly reduce the interference of other signals. Its coverage is more scaled, and the first unique new aircraft carried every year is expanded to several square kilometers, which greatly improves the mobility of WLAN. In addition, the 802.11n standard also solves the compatibility problem between base stations and terminals of different systems. These features make the combination of WLAN and wireless wide area possible. Today, major operators have expanded WiFi networks, precisely because it can be combined with 3G networks to help cellular networks share data traffic

history of Ethernet Serial port converter

at present, the Ethernet interface of computers has been widely used. Generally, every computer has at least one Ethernet interface. In the field of industrial communication, Ethernet port has gradually occupied the market of traditional rs-232/rs-485, can, USB and other communication interfaces. Today, when Ethernet technology is gradually popularized in industrial communication, we take Boshi electronic products as the representative to introduce the development of several generations of typical Ethernet/serial port products, including: Ethernet/rs-232/rs-485/rs-422 general-purpose converter, photoelectric isolated Ethernet/rs-232/485/422 general-purpose converter, Ethernet/serial port optical fiber converter

Bosch electronic Ethernet/serial port converter (model: eth232l1) is used to transfer an Ethernet port. What problems do we need to pay attention to? Replace it with RS-232, RS-485 (half duplex) or RS-422 port (full duplex). Bosch eth232l1 micro Ethernet/serial port converter has a super small patented shape (80*23*47mm), RS-232, RS-485, RS-422 universal (with wiring terminals), which can be virtualized as a local com serial port (com1-com256) without modifying the existing serial port communication software. At the same time, it is equipped with communication source program (vc++, VB, BC can be embedded in user communication program) and Ethernet virtual serial port mapping program

eth232l1 product has the following basic performance characteristics: virtual serial port, ultra small. Eth232l1 is mainly designed for Ethernet Remote industrial communication. Due to RS-485 or RS-422 interface, the communication distance is increased to 1200 meters (9600bps). Subsequently, the product of eth232gh launched by Boshi electronics added photoelectric isolation, which can realize the three-way isolation of Ethernet, power supply and serial port. Its shape and use are the same as eth232l1

the Ethernet/serial port optical fiber converter with the model of opet232l1 of Boshi electronics can directly convert a pair of optical fiber transceivers from the Ethernet port to transmit serial port signals. The shape and driver are the same as those of Bosch eth232l1 series converter. Since the opet232l1 optical fiber transmits serial port signals, it must be used in pairs or with the opt series serial port/optical fiber converter of BOLS. Opet232l1 is different from the common Ethernet optical fiber transceiver used for network communication. The serial port rate of opet232l1 is 1200, 2400, 4800, 9600, 115200bps. Common Ethernet optical fiber transceivers transmit Ethernet signals of tcp/ip protocol, and their rates are 10m, 100m or 1000m. Compared with serial communication, tcp/ip communication protocol is more complex, the amount of data per frame is too large, and the key is poor real-time performance. The Ethernet/serial port optical fiber converter of Boshi electronics is more suitable for optical fiber communication in the field of industrial measurement and control because it adopts RS-232 serial port communication protocol

the emergence of WiFi serial port converter

the wf232l WiFi serial port converter of Boshi Electronics (as shown in Figure 3) has opened up a new field for the mobile connection of rs-232/485/422 devices, eliminated the cumbersome wiring work, increased the flexibility of serial port device connection, and brought the serial port devices that need connection into a new era of mobile interconnection

in 2011, Boshi electronics launched a wireless WiFi serial port converter, which uses ieee802.11b/g technology and the existing wireless AP to connect any serial port equipment at any time, wirelessly and flexibly. As long as the traditional rs-232/485/422 serial port device is inserted into the serial port of wf232l, the device can be immediately connected to the wireless Ethernet or interconnection without wiring and be monitored remotely. Wf232l can not only be interconnected by wireless ad hoc mode, but also be connected to AP (wireless access point) by wireless infrastructure mode, with strong expansion ability. With a small investment, we can turn the serial port equipment without connection ability into network level serial port equipment, which radiates their vitality and saves the investment cost

serial port devices using wf232l can be widely used in POS sales points, serial port printers, serial port LED displays, security equipment manufacturers and system integration, medical equipment manufacturers and system integration, freight yard distribution systems/logistics control systems, industrial automation applications and any remote connection environment without wiring of serial port devices. With the vigorous development of the wired server market of serial port equipment, the demand for wireless server of serial port equipment is also increasing. WiFi serial port converter is developed in line with the trend. Using ieee802.11b/g wireless data transmission, it managers and service managers can remotely monitor, diagnose, upgrade and manage devices on. Any serial port device can be connected wirelessly, especially in the highly flexible mobile environment such as medical system, POS sales terminal and logistics system, which is also more important. In addition, in construction sites, buildings and industrial automation environment, wiring is very troublesome and sometimes impossible. Wireless connection has great potential. Therefore, wireless connectivity also opens up a new path for distributed computing. In order to access local or Internet, wf232l integrates tcp/ip network stack and has built-in web server, which is convenient for configuration, display operation and diagnosis. Its serial port rate can reach the highest rate in the industry, from 1200 to 115200bps. Provide a DB9 pin serial port, rs-232/422/485 three in one, and also provide WEP encryption measures

Boshi wf232l wireless wifi/serial port converter converts the WiFi signal of wireless AP into RS-232, RS-485 or RS-422 serial port. Wf232l adopts high-performance and low-power ieee802.11b/g wireless communication chip, with built-in high-performance microprocessor to realize transparent transmission of serial port data. It works in the 2.4GHz global open ISM band and is used without license. It can be widely used in short-range wireless communication and industrial control fields in various occasions. The product itself can connect its own serial port

Copyright © 2011 JIN SHI