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Industrial Data Communication News and Techniques • Winter 2001, V2 #1
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Case Studies
Data-Linc and Allen-Bradley installation— Expanding legacy SCADA system to meet growing demands
TEXAS— Confronting growth and data accessibility demands in Utility companies can involve exorbitant system upgrade costs. Lakeway Municipal Utility District in Austin, TX chose to incorporate Data-Linc Group’s wireless Ethernet radio modems with Allen-Bradley PLCs to economically expand their legacy system and close the data acquisition gap. Read the article with diagram.
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Lakeway Municipal Utility Department SRM6210E Ethernet radio modem network
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HSLT frame crane at shipbuilding facility in China
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Data-Linc and GE Fanuc installation— Data-Linc Ethernet Radio Modems Team with GE Fanuc PLCs for Shipbuilding HSLT Crane Control
CHINA— Data-Linc wireless Ethernet modems provide reliable, cost-effective data communication for a large shipbuilding application. Data needed to be transferred between two central monitoring/control stations and the new-concept HSLT (Hydraulic Synchronizing Lifting Technique) crane designed to handle oversized components. Read the article with diagram.
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Data-Linc and Schneider Electric installation— Sussex County SCADA Upgrade: Modernization without compromise
DELAWARE— Modernization in any business can be a consuming project. Sussex County’s water/wastewater facility, consisting of over 350 sites, decided to upgrade their SCADA (Supervisory Control and Data Acquisition) system due to operational demands. These demands included an increase in data acquisition capabilities and overall modernization. Read the article with diagram. |
Sussex County SRM6210E Ethernet radio modem network
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Clear skies over Beijing China’s Temple of Heavenly Peace
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Data-Linc and Siemens Installation— Skies clear over China's Temple of Heavenly Peace
BEIJING— To improve the winter air quality in the Temple of Heaven area of Beijing, the government of Chongwen District replaced the coal fuel heating with gas fuel boilers and revamped the automation and communication system designed around a Siemens S7-300 PLC with a WinCC HMI and Data-Linc 2.4GHz wireless Ethernet modems. The boilers are monitored and controlled from either of two command centers. See the complete article and diagram. |
Tutorial
Wireless Video Applications in Industrial Environments
Wireless video in an industrial environment can be a challenge to implement. Read a general overview of the evolution of video technology, radio technology applications and the pairing of these components to create wireless video networks in industrial environments.
Sponsorship
Serial Radio Modems Support Purdue University’s Solar Race Car
 Data-Linc Group’s SRM6000 radio modems continue to play an integral part in Purdue’s Solar Racing telemetry system. The requirement is to transfer important vehicle information from a micro-controller based data acquisition system that is part of the solar car, to a personal computer in a chase or lead vehicle. It is then analyzed in real time and is essential in formulating and updating race strategy and ensuring that the strategy is followed. The data sent by the telemetry is: battery current, array current, battery pack voltage, individual battery temperatures, and vehicle speed. The strategy followed by the Purdue Solar Racing Team is formulated to minimize the time taken to complete the race. |
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 Some features that we feel are important about these radio modems are the adjustable power output, range, and robustness. The adjustable power is important to us because it is desirable to keep energy usage of peripherals at a minimum. The adjustable energy output allows us to set the power usage by the radio modem to the minimum level that is detectable by the receiving end. For accurate race strategy, data loss needs to be kept to a minimum. Because of this, the large range of these modems allows the data to be accurately received by the personal computer in the chase vehicle over greater distances. Finally, dependable components on any vehicle are a necessity. The modems were put to the test on the 2003 American Solar Challenge in which Purdue Solar Racing participated. Over 2,300 miles of harsh roads were put on the car using the SRM6000 modems. A solid telemetry link with the car was ALWAYS made. |
Kevin Rosenbaum
Purdue Solar Racing
FAQ
1. Question: What is the difference between the LLM1100/B202 and the LLM1100/V.23? Are these modems compatible with each other? Is there an advantage to using one over the other?
Answer: The LLM1100/B202 modem operates at 1200 and 2200Hz. The LLM1100/V.23 operates at 1300 and 2100Hz. There is no advantage using one over the other. Telephone company lines will pass all of these frequencies.
2. Question: What is EIRP and why should this concern me in an RF installation?
Answer: EIRP stands for “Effective Isotropically Radiated Power”. This is the amount of power transmitted to the air from the antenna. It is a concern because the FCC limits this to 4 Watts EIRP (+36dBM) for 2.4 GHz multipoint applications. Data-Linc will not supply any antenna package that violates this FCC rule.
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