By Steve Mackay CPEng BSc (ElecEng) BSc (Hons) MBA, Edwin Wright MIPENZ BSc (Hons) BSc (Elec Eng), Deon Reynders Pr Eng BSc (ElecEng) (Hons) MBA, John Park ASD
There are lots of facts communications titles masking layout, deploy, and so on, yet nearly none that in particular specialize in commercial networks, that are an important a part of the day by day paintings of commercial keep watch over structures engineers, and the focus of an more and more huge staff of community specialists.The concentration of this e-book makes it uniquely appropriate to manage engineers and community designers operating during this quarter. the commercial program of networking is explored by way of layout, install and troubleshooting, construction the talents required to spot, hinder and attach universal commercial facts communications difficulties - either on the layout degree and within the upkeep phase.The concentration of this booklet is 'outside the box'. The emphasis is going past ordinary communications concerns and thought to supply the required toolkit of information to unravel commercial communications difficulties overlaying RS-232, RS-485, Modbus, Fieldbus, DeviceNet, Ethernet and TCP/IP. the assumption of the ebook is that during interpreting it you need to be in a position to stroll onto your plant, or facility, and troubleshoot and connect communications difficulties as speedy as attainable. This booklet is the one identify that addresses the nuts-and-bolts concerns desirous about layout, deploy and troubleshooting which are the day by day drawback of engineers and community experts operating in industry.* presents a distinct specialize in the commercial software of information networks* Emphasis is going past usual communications matters and conception to supply the mandatory toolkit of data to resolve commercial communications difficulties* offers the instruments to permit engineers in quite a few vegetation or amenities to troubleshoot and fixcommunications difficulties as quick as attainable
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Additional info for Practical Industrial Data Networks: Design, Installation and Troubleshooting
If pin 3 is ON, it is probably a DCE. Another clue could be the sex of the connector, male are typically DTEs and females are typically DCEs, but not always. 9 A 9-pin EIA-232 connector on a DTE When troubleshooting an EIA-232 system, it is important to understand that there are two different approaches. One approach is followed if the system is new and never been run 48 Practical Industrial Data Networks: Design, Installation and Troubleshooting Problem Garbled or lost data First characters garbled No data communications ASCII data has incorrect spacing Probable cause of problem Baud rates of connecting ports may be different Connecting cables could be defective Data formats may be inconsistent (Stop bit/parity/ number of data bits) Flow control may be inadequate High error rate due to electrical interference Buffer size of receiver inadequate The receiving port may not be able to respond quickly enough.
What is the speed of the communication? 2 What is the distance between the equipment? Is it a noisy environment? Is the software setup correctly? Typical approach When troubleshooting a serial data communications interface, one needs to adopt a logical approach in order to avoid frustration and wasting many hours. A procedure similar to that outlined below is recommended: 1. 2. Check the basic parameters. Are the baud rate, stop/start bits and parity set identically for both devices? These are sometimes set on DIP switches in the device.
Some new devices operating in the same power supply may be the cause of the problem. This ranges from power factor capacitor banks to new variable speed drives installed to a large radio source. • Check whether there has been any changes or damage to screening of the cables. The higher the data rate, the more critical this becomes with massive errors, which are possible only with a few mm of screening removed. • Check whether the voltages are correct. For example, if it is a hub, check that the voltage powering it is correct.