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通訊方式是利用美ni公司的工控機(jī)與臺達(dá)vfd-b系列變頻器的rs-485串口通訊。工控機(jī)的控制器為 ni pxi-8106，自帶1個rs-232通訊串口。由于系統(tǒng)還需要與儀表和plc通訊，而且變頻器、儀表和plc三者之間的通訊協(xié)議不同，工控機(jī)另配有1塊串行通訊模塊ni pxi-8431(含有兩個rs-485串口)。使用工控機(jī)rs-232串口和臺達(dá)變頻器的rs-485串口通訊，中間需加rs-232/rs-485轉(zhuǎn)換器，如圖1所示。如果使用串行通訊模塊ni pxi-8431的rs-485串口，須用db-9連接器連接工控機(jī)的rs-485串口與變頻器的rs-485串口，如圖2所示
廈門岳航計算機(jī)工程有限公司
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