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The timing circuit uses a resistor and capacitor to set the retriggering time constant. The circuit enables the driver when it detects the leading edge of the first data pulse. As long as data is being received by the converter the timing circuit is continuously retriggered, maintaining the enable signal to the RS-485 driver. When the data stops (and the data signal returns to the idle state) the timing circuit releases (disables) the driver after a configurable period of time, typically one character length (ten bit lengths). 

MATRIX    83PKB  83PKB-SM

83PKB  83PKB-SM | MATRIX | PLC Module System

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When using a retriggerable time circuit the timing circuit can be configured by changing the R and/or C values. 

Some RS-485 devices come from the factory with R/C values preset for 9600 baud. Others have switch selectable presets. 

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