Flow control (data): Difference between revisions

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* Polarity:
** RS-232 level signals are inverted by the driver ICs, so line polarity is TxD-, RxD-, CTS+, RTS+ (Clear to send when HI, Data 1 is a LO)
** for microprocessor pins the signals are TxD+, RxD+, CTS-, RTS- (Clear to send when LO, Data 1 is a HI)