Practical Industrial Data Networks:Design, Installation and ...
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Practical Industrial Data Networks:Design, Installation and ...

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70<strong>Practical</strong> <strong>Industrial</strong> <strong>Data</strong> <strong>Networks</strong>: <strong>Design</strong>, <strong>Installation</strong> <strong>and</strong> TroubleshootingDevice #1 Device #220 mATransmitCurrentDetectorCurrentDetector20 mATransmitFigure 5.1The 20 mA current loop interface5.2 Serial interface convertersSerial interface converters are becoming increasingly important with the move away fromEIA-232C to industrial st<strong>and</strong>ards such as EIA-422 <strong>and</strong> EIA-485. Since many industrialdevices still use EIA-232 ports, it is necessary to use converters to interface a device toother physical interface st<strong>and</strong>ards. Interface converters can also be used to increase theeffective distance between two EIA-232 devices.The most common converters are:• EIA-232/422• EIA-232/485• EIA-232/current loopFigure 5.2 is a block diagram of an EIA-232/EIA-485 converter.EIA-232EIA-232 to EIA-485ConverterEIA-485MPTxDRxD232 232232232DRA A485B B485A A485 B B 485RxDTxDMPComComFigure 5.2Block structure of EIA-232/EIA-485 converterFigure 5.3 shows a circuit-wiring diagram.

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