Configuring a port for RTS/CTS hardware handshaking

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Modems attached to the server operating at a speed of 9600 or above are recommended to use RTS/CTS hardware handshaking instead of XON/XOFF flow control.

This will avoid buffer overrun in a system with limited resources. RTS is not a default value on any tty port and must be set by the system administrator accordingly. 

Prerequisites

You must use at least a five-wire cable to support RTS/CTS.

To enable RTS/CTS for a port, use the following steps:

  1. Use the smit tty fast path.
  2. Select Change / Show Characteristics of a TTY.
  3. Select the tty on which RTS/CTS is to be enabled.
  4. Set the FLOW CONTROL to be used field to rts.
  5. Select Do.
  6. Exit SMIT.