Unit3_7_RS-232C_Serial_Data_Transmission_Standard (1)

Unit3_7_RS-232C_Serial_Data_Transmission_Standard (1) -...

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T.RANGA BABU,Dept.of ECE The USART is used to interface microcomputer buses with serial-data communication lines. The TTL signals output by a USART are not suitable for transmission over long distances These signals are need to be converted to some other form before transmitted . 20- AND 60-mA Current Loops: In teletypewriters or other current-signal systems, some manufacturers use a nominal current of 20mA to represent a 1 , or mark , and no current to represent a space . Other manufacturers use a nominal current of 60mA to represent a 1 and no current to represent 0. SERIAL-DATA Transmission
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T.RANGA BABU,Dept.of ECE In the 1960s as the use of timeshare computer terminals became more widespread, modes were developed so that terminals could use phone lines to communicate with distant computers. MODEMS and other devices used to send serial data often referred to as Data Communication Equipment or DCE . Terminals or Computers that are sending or receiving the data are referred to as Data Terminal Equipment or DTE . In response to the need for signal and handshake standards between DTE and DCE , the Electronic Industries Association (EIA) developed, EIA standard, RS-232C .
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