DK04 Monitoring Module and Computer communication interface circuit

  
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As shown in figure, D187 is an UART, it`sRX / TX signalconnectedonoptocoupler N21, N22 and N29, so that put the RS-485communication interface receiver / transmitter D28and microprocessor D211 completely optoelectronicisolated. D197 is a generator, the currently communication rate is 9600bit / s. D189 is another universal asynchronous receiver transmitter. Op..




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