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Do I need to terminate modem control signals if I'm not using them?
Reference Number: AA-00179 Views: 1900 Created: 12/09/2009 12:00 am Last Updated: 09/02/2016 05:34 pm 0 Rating/ Voters


It is always a good idea to terminate any un-used signal lines. Floating signals can generate interrupts and drastically degrade system performance. The Sealevel SeaCOM serial driver provides a means of suppressing modem control interrupts. The driver features can be located in the Microsoft Windows Device Manager. If you are not using the Sealevel SeaCOM serial driver, or are using a different operating system, terminate each modem control line by connecting it to its complement:

  • Connect CTS to RTS
  • Connect DCD to DTR to DSR
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