Internal and external communication

Internal and external communication

1. Port

   • Is a connection
   • Is used to conect some devices
   • Allows exchange data
   • Serial Ports
     • Asynchronous adapter
     • Intercomunicar several computers together
     • Receives and sends information
     • 25 pin
     • Serial interface connector
     • DTE (Data terminal Equipment)
     • DCE (Data Comunication Equipment)
     • 1 Pin - P.G. - Safety Ground
     • 2 Pin - TD -> DCE - DTE output
     • 3 Pin - RD -> DTE - DTE input data
     • 4 Pin RTS -> DCE - Request to Send DTE
     • 5 Pin - CTS -> DTE - DCE ready to transmit
     • 6 Pin - DSR-> DTe - CE ready to com . DTE
     • 7 Pin - GND - Common ground circuit
     • 8 Pin - DCD -> DTE - Stopping carrier
     • 20 Pin - DTR -> DCE - Terminal Signal available
     • 23 Pin - DSRD - Speed ​​indicator TX
     • COM1 and COM2
     • Chip UART
     • Communication in one direction
     • Used addresses and a signal line
   • Parallel Port
     • I/O
     • Type D-25
       • 25 Pin
     • It is used by printers
     • LPT (online printer)
     • DB25
       • Socket
       • 36 Pin
     • 8 bits = 1 byte
     • 5 inputs "Steady-State Input points"
     • DATA
     • STATUS
     • CONTROL
     • 17 signal lines and 8 ground lines
       • 4. Control lines
       • 5. state lines
       • 8. Data lines

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