1. Wireless industrial control
By using wireless technology-based networked intelligent sensors, combined with a variety of wireless LAN bridges based on IEEE 802.11b appearing on the market at the present time, it is possible to realize wireless LAN technology in the industrial control network in a kind of application Program. The wireless LAN bridge is used as a wireless access point (AP), and the networked intelligent sensor based on wireless technology collects the field data, processes it, and packages the data with TCP/IP protocol, and sends it to the AP through the wireless link, because the wireless link and the wired Ethernet high-level are using TCP/IP protocol, and the low-level protocol is transparent to the high-level protocol, so it realizes the seamless connection between the wireless network and the wired network. Seamless connection between wireless network and wired network is realized. Through the Internet, remote monitoring can be realized.
2. Selection of wireless devices
To realize the wireless network, you need to choose the equipment is generally two kinds. One is a wireless LAN bridge, which can connect multiple wireless sites into an existing LAN; the other is a wireless communication device, such as wireless LAN cards, wireless Modem, etc. The following is an introduction to Advantech's wireless devices. Advantech's wireless devices are described below.
A. WLAN-9200 Series 11Mbps Industrial Wireless LAN Access Point
The WLAN-9200 is an enhanced 11Mbps wireless LAN bridge for outdoor use. It is capable of connecting multiple remote stations to the LAN without any physical wiring.
Features:
-Supports IEEE 802.1lb standard 2.4GHz ISM band
-Supports Advanced User Authentication for ruggedized security WEP128, MAC address control
-With IP 66/NEMA 4x compliant waterproof and rustproof enclosure protects the system from damage
- Provides cooling fan and heater. Provides cooling fans and heaters to prevent the system from overheating and overcooling
- Provides push buttons and LED displays for easy temperature setting
- Protects the power supply, LAN, and wireless interfaces with IP66 waterproof connectors
- Provides a variety of antennas for increased transmission range
The WLAN-9200 is an enhanced 11Mbps wireless LAN network for outdoor use. 11Mbps wireless LAN bridge. It is capable of connecting multiple remote stations to a LAN without any physical cabling. This saves a great deal of cost in maintaining and setting up a corresponding cable network.The WLAN-9200 comes with a ruggedized enclosure that protects the system from damage caused by water, acid, lightning, low and high temperatures. Due to these features, the WLAN-9200 is extremely stable and reliable, making it ideal for outdoor applications. As a result, the WLAN-9200 is ideally suited for use in harsh locations where wiring is difficult, such as reservoirs and buildings.Compatible with the IEEE 802.1lb standard, the WLAN-9200 comes with a variety of powerful features. It is capable of delivering high transmission speeds of 11Mbps while providing high security protection (WEP: 128-bit), DHCP clients, SNMP agents, etc. In addition, in order to meet the requirements for use in harsh outdoor environments, the WLAN-9200 provides advanced system protection features: glow-in-the-dark protection, cooling fans, heaters, waterproof interfaces, industrial equipment cases, power supply/LAN coaxial cables, and more.
Low Cost, Easy Installation
The WLAN-9200 can connect different distributed sites together to form a wider range wireless network. It saves the cost of wiring to remote locations. the WLAN-9200 features a specialized design that allows users to attach and detach it easily and quickly. In addition, the WLAN-9200 provides push buttons and LED displays for showing and setting high/low temperatures. Users can use it to quickly set up their own wireless network. To be able to use it in a longer range, the WLAN-9200 also provides various antennas for longer transmission distance.
Robust Design for Reliability and Stability
The WLAN-9200 features an advanced design with a rust-free, waterproof enclosure that provides effective protection for the system. It meets IP 66/NEMA 4x standards for corrosion resistance, UV protection, security and automatic fire suppression. To prevent the WLAN-9200 from overheating or overcooling internally, Advantech also designed a cooling fan and a heater inside it, and users can set the high/low temperature settings. When the operating temperature is above or below the user-specified temperature, the cooling fan or heater will start working. In addition, the WLAN-9200 provides a waterproof interface and anti-flash protection for power, LAN and antenna interfaces.
Fast Data Transmission Between Remote Sites
The WLAN-9200 is fully compatible with the high-speed wireless LAN standard, IEEE 802.1 lb, and it offers 11 Mbps (over the air) for faster data transmission.The WLAN-9200 utilizes the DSSS technology in the 2.4 GHz ISM band, which is not interrupted by noise. interference, making data transmission safer and more reliable.
Keeping Communications Private
The WLAN-9200 employs a variety of security features to protect your wireless network (WEP128 encryption, MAC address control and password security). By employing advanced WEP128 encryption, you have the option of a WEP key to protect your data from being viewed by unauthorized wireless users, only the accessibility of the access point and wireless adapter, and multiple security mechanisms working in tandem, can effectively prevent unauthorized access to your wired and wireless network.
B.ADAM-4550 Series 2.4GHz Wireless Modem (RS-232/485 Interface)
The ADAM-4550 is a direct-sequence spread spectrum wireless modem. It operates on the 2.4GHz ISM band, which is available worldwide without application. Through the RS-232 or RS-485 serial port, the ADAM- 4550 can communicate with computers or other devices at speeds up to 115.2Kbps.
The ADAM-4550 operates in half-duplex and transmits data wirelessly at 1Mbps. It has an output power of 100mW and it can transmit up to 150 meters if using its own small antenna, or more than 20 kilometers (line-of-sight) if using Advantech's high-gain outdoor antenna.
The RS-485 standard supports half-duplex communication. This means that data can be sent and received using a pair of twisted pairs. The direction of the data flow is normally controlled by the handshake signal RTS (Request to Send). However, there is a dedicated I/O circuit in the ADAM-4550 that can be used to detect the direction of data flow and automatically switch the transmission direction without the need for a handshake signal.
The ADAM-4550 wireless modem provides reliable wireless connectivity for point-to-point or point-to-multipoint networks. A typical application is to connect one ADAM-4550 module to a host computer via RS-232 and place other ADAM-4550 modules at a remote site. Each ADAM-4550 module can be connected to a remote device via an RS- 4550 network. The remote ADAM-4550 module transmits remote data to the master ADAM- 4550 module, which sends control commands to the remote ADAM-4550 module via wireless transmission.