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  2. A serial cable is a cable used to transfer information between two devices using a serial communication protocol. The form of connectors depends on the particular serial port used. A cable wired for connecting two DTEs directly is known as a null modem cable.
    en.wikipedia.org/wiki/Serial_cable
    Null modem, also called crossover, is a term associated with serial (RS-232) cables. A standard serial cable, also called an AT cable, has the wires inside the cable running straight through. Take a DB9 cable as an example. Pin 1 on one end of the cable would be connected to Pin 1 on the other end.
    www.showmecables.com/blog/post/what-is-a-null-…
     
  3. Serial Parallel Cables. Shop and Buy Online - elara.ie

     
  4. RS232 Serial Null Modem Cable for programming and repairing …