The different processing states of the physical ASYNC device driver, the ASYNC hardware, and the ASYNC control signals are listed below:

• Automatic Receive Flow Control (XON/XOFF)
  
• Automatic Transmit Flow Control (XON/XOFF)
  
• Bit Rate
  
• Break Replacement Character
  
• Break Replacement Character Processing
  
• COM Event WORD and COM Error WORD
  
• Data Bits
  
• DTR and RTS
  
• DTR Control Mode
  
• Error Replacement Character
  
• Error Replacement Character Processing
  
• Extended Hardware Buffering
  
• Input Sensitivity Using DSR
  
• Null Stripping
  
• Output Handshaking Using CTS, DSR, DCD
  
• Parity
  
• RTS Control Mode
  
• Read Timeout State
  
• Read Timeout Value
  
• Stop Bits
  
• Transmit Immediate
  
• Transmitting Break
  
• Write Timeout State
  
• Write Timeout Value
  
• XON/XOFF Characters

Each of the above states are covered as follows:

• A brief description 
  The initial (default) value
  
  The effect on the physical device driver when the physical device driver receives an OPEN request packet for the port and the port is not already open (from a previous OPEN without a matching CLOSE)

  This is called a First Level Open. If applicable, the way the state of the physical device driver is affected by a CLOSE request packet.

  
  How the MODE utility can be used to alter the state of this item or how the MODE utility will alter the state of this item
  
  The effect on the physical device driver of the state of Extended Hardware Buffering

  In particular, special considerations relating to Automatic Protocol Override are given where the protocol being described is affected by this feature of the physical ASYNC device driver.

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