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Serial Communication Standard Protocol

Most of the standard is a derivative of a formal mature technology. The following introduces the serial communication the is commonly used in the industries. Most of them are fairly similar but are known as a different name.

Common Physical Communication Layer

  • UART (0-5V, 0-3.3V)
  • RS232
  • RS485, RS422
  • Ethernet
  • USB
  • KNX/EIB
  • LIN (for automotive single wire)

Other Physical Communication Layer

  • RF

Protocol Layer on the common Physical Layer

Protocol layer is the data byte format design for a certain method of communicating. The protocol layer make use of the physical layer to send the data over a communication channel.

The following are some

  • Modbus (uses RS485, RS232 or Ethernet)
  • CAN bus (uses RS485)
  • MDB, Multi Drop Bus protocol (uses 9 bits RS232/RS485)
  • Multi-Master Bus

Other Protocol Layer

  • WiFi
  • Zigbee
  • Xbee
  • Zwave
  • Bluetooth