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變頻器通訊口使用的是水晶頭，只需壓兩根線，為了減少干擾，通訊線使用雙絞屏蔽線。使用工控機(jī)的rs-485通訊口時(shí)，須把db-9的4腳與8腳短接，然后連接變頻器的4：sg+，把db-9的5腳與9腳短接，然后連接變頻器的3：sg-，見(jiàn)圖3。使用工控機(jī)的rs-232通訊口時(shí)，接線方法是把rs-232/rs-485轉(zhuǎn)換器的d+/a連變頻器的4：sg+，d-/b連變頻器的3：sg-，見(jiàn)圖4。
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Cole-Parmer 37000-00 Temperature, Humidity and Air Velocity Meter w/ Hard Case
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Sony TW-TL1S Video Microscope, NTSC Color, 410,000 Pixels, 10x Zoom
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