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2. RS-232 - Wikipedia

   en.wikipedia.org/wiki/RS-232

   A DB-25 connector as described in the RS-232 standard Data circuit-terminating equipment (DCE) and data terminal equipment (DTE) network. In telecommunications, RS-232 or Recommended Standard 232 [1] is a standard originally introduced in 1960 [2] for serial communication transmission of data.

3. Serial port - Wikipedia

   en.wikipedia.org/wiki/Serial_port

   A male DE-9 connector on an IBM PC compatible computer (with serial port symbol) used for an RS-232 serial port A female DE-9 connector on an RS-232 cable. A serial port is a serial communication interface through which information transfers in or out sequentially one bit at a time. [1]

4. Data Terminal Ready - Wikipedia

   en.wikipedia.org/wiki/Data_Terminal_Ready

   Data Terminal Ready (DTR) is a control signal in RS-232 serial communications, transmitted from data terminal equipment (DTE), such as a computer, to data communications equipment (DCE), for example a modem, to indicate that the terminal is ready for communications and the modem may initiate a communications channel.

5. Serial communication - Wikipedia

   en.wikipedia.org/wiki/Serial_communication

   In telecommunication and data transmission, serial communication is the process of sending data one bit at a time, ... RS-232 connector (D-Sub DB-25 variant)

6. Software flow control - Wikipedia

   en.wikipedia.org/wiki/Software_flow_control

   Software flow control is a method of flow control used in computer data links, especially RS-232 serial. It uses special codes, transmitted in-band, over the primary communications channel. These codes are generally called XOFF and XON (from "transmit off" and "transmit on", respectively). Thus, "software flow control" is sometimes called "XON ...

7. Data Carrier Detect - Wikipedia

   en.wikipedia.org/wiki/Data_Carrier_Detect

   Data Carrier Detect (DCD) or Carrier Detect (CD) is a control signal present inside an RS-232 serial communications cable that goes between a computer and another device, such as a modem. This signal is a simple "high/low" status bit that is sent from a data communications equipment (DCE) to a data terminal equipment (DTE), i.e., from the modem ...