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예식일 : Believing These Five Myths About Rs485 Cable Keeps You From Growing
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Capable of performing mathematical operations in the input channels, this high-speed reading and logging device utilized a 24-bit A/D converter enabling up to 1000 samples a second and a suite of connectivity options including a 10/100 Mbps Ethernet interface that allowed for access through a browser (HTTP), FTP (client and server), e-mail sending (SMTP), SNMP and Modbus TCP. The serial RS232 to RS485 converter and RS232 to RS422 converter units, also called serial converters, are small electronic devices used to convert a serial RS232 signal, (for example the COM port in older computers) into either RS485 or RS422 signals. The maximum number of devices that can be connected to a main cable is 32, including the Master. A Modbus RS485 connects a Master device to one or more Slave devices. The device lists all alarm records clearly with useful information and also reminds the user of the alarm status in different colors. The Brainchild also entirely eliminates the need to search through large amounts of hard copy records to find earlier data. CAS DataLoggers together with high-quality manufacturer Brainchild has the solution with the VR-18 Paperless Chart Recorder, a high resolution (true VGA, 640x480 pixels) 18-channel data logger featuring an infrared detector, plug & play I/O card, high flexibility, and user-friendly operation, all in a compact size.

Paperless chart recording is a much more user-friendly solution with an interactive dialogue simplifying both setup and operation procedures. This versatile datalogger proved to be a cost effective solution for handling analog, digital and other types of variables with high resolution and speed and also offered expansion modules. It also offered 2 relay outputs and 8 digital ports individually configurable as inputs or outputs. This high performance and high connectivity equipment also offered personnel easy configuration and operation to get the project underway as quickly as possible. The only possible reference is the reading of the displayed value, for example, of the current. In this case it is possible to connect the main inlet and outlet terminal directly to the terminals of an instrument without creating a branch. This type of multifunction instrument is ideal in panels where space is limited, in substation panels and in main industrial panels. In multifunction instruments, not only the cables connected to the measurement, but also the RS485 serial port and the analog and digital inputs and outputs must be wired. If there is a large potential difference between neutral and earth, this could negatively affect the measurement, in the case of instruments with non-galvanically isolated measurement inputs.

This analog and digital variables data logger featured 8 configurable analog inputs that could read thermocouples, Pt100, Pt1000, voltage and current signals. In order to ensure that the instrument is properly protected, fuses must always be fitted to the power cables of the digital instruments and to the measurement inputs of the voltmeter. In a three-phase system, instruments can be installed that measure the single electrical parameter, one per phase, or a voltmeter and a current can be installed with the voltage and current switches, allowing the measurements to be displayed in sequence. Start from the need: what do I want to measure? In a single phase system, analog and digital instruments are selected to measure voltage, current, frequency, and power factor. Choosing an analog instrument ensures good reading stability, due to the mechanical inertia of the needle and the fact that the reader immediately knows whether the instrument is operating normally or if the reading is out of range.

Choosing a digital instrument guarantees better readability, also in low light conditions, especially for instruments with LED displays, and immediate reaction to measurement variation. Some measuring instruments have bar indicators that show the current level as a percentage of the set full scale. If not only the electrical parameters are to be monitored, but also the energy consumption, measuring instruments which also have active and reactive energy metering should be selected. There are different families of products on the market: instruments which measure a single electrical parameter (voltage, current, frequency, and phase angle cosϕ), generally used in single-phase systems, as instrumentation on the machine, and instruments allowing all the electrical parameters to be measured and displayed, both for the single-phase system and for the three-phase system. The product engineer then connected the FieldLogger to a Celesco SM2 miniature string pot to detect and measure linear position and velocity over time. The string pot was mounted to a fixed surface and its cable attached to the floor panel under monitoring. The VR-18 Paperless Chart Recorder can be connected to a PC with an Ethernet cable allowing students to use the Brainchild's FREE software, allowing for streaming live data or downloading the data to an Excel spreadsheet to further manipulate the information for reports and assignments.

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