The data in the line will be distorted, which may or may not lead to devices receiving distorted data. Sometimes this will be used to detect transmission failure due to a collision.
, , . , , , , ( CRC) .
. - , . , ASCII XON XOFF , RTS (Request To Send) CTS (Clear To Send). XON/XOFF .
RS-232 ( , ). RS-485, . , , , ( 10base2 Ethernet, CAN, LIN, FlexRay, I2C,...).