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Member #1450768

Member Since: October 10, 2018

Country: United States

  • The negative voltage is generated by the TX RS232 ( as its a true rs232 and negative volts (mark) is "Idle state" in most serial codes the capacitor will always be charged enough) it passes thru the diode and charges the 10uf capacitor enough so that when a mark (negative voltage) is needed on the RX line it is available from the charge in that capacitor. The positive volts (space) is enough to swamp it when the transistor in the RX line is turned on to send a space.

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