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Extra info for A 2-approximation for the preceding-and-crossing structured 2-interval pattern problem

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The current revision is EIA-232E (1991). g. a computer or printer). g. a computer or Modem). g. telephone system). 1 RS-232 receiver voltages The RS-232 transmitter has to produce a slightly higher voltage level in the range of +5 volts to +25 volts and -5 volts to -25 volts to overcome the voltage drop along the line. In practice most transmitters operate at voltages between 5 volts and 12 volts. The RS-232 standard defines twenty-five electrical connections, which are each described later. The electrical connections are divided into the four groups namely data lines, control lines, timing lines and special secondary lines.

Consequently the cable shield is usually connected at one end only. Pin 2 – Transmitted data (TXD) This line carries serial data from pin 2 on the DTE to pin 2 on the DCE. The line is held at MARK (or a negative voltage) during periods of line idle. Pin 3 – Received data (RXD) This line carries serial data from pin 3 on the DCE to pin 3 on the DTE. Pin 4 – Request to send (RTS) See Clear to send. Pin 5 – Clear to send (CTS) When a half-duplex modem is receiving, the DTE keeps RTS inhibited. When it becomes the DTE’s turn to transmit, it advises the modem by asserting the RTS pin.

The four most commonly used control lines are: • • • • RTS – Request to send CTS – Clear to send DSR – Data set ready (or DCE ready in RS-232D/E) DTR – Data terminal ready (or DTE ready in RS-232D/E) Note that the handshake lines operate in the opposite voltage sense to the data lines. When a control line is active (logic=1), the voltage is in the range +3 to +25 volts and when deactivated (logic=0), the voltage is zero or negative. The typical structure of the data frame used for RS-232 applications is as follows.

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