Rs232 Cts / Rts monitor change on external device

Discussion in 'General Electronics Chat' started by rhebert, Nov 5, 2007.

  1. rhebert

    Thread Starter New Member

    Nov 4, 2007
    I have a LED on a device that outputs around 2v DC.
    What I would like to do is tie into this LED on the device to detect when the LED is turned on.
    I have cut the positive terminal and tied into it and connected it to CTS on the serial port and am able to detect the signal.
    The problem comes in when a USB to RS232 is used on multiple devices.
    The CTS / RTS is triggered on all devices.
    My thoughts were to put a relay between the LED and have the CTS
    hooked to the relay . The problem is I can't find a Relay that trips on 2 volts.
    It works fine currently from Regular PC Rs232 issue only is when they are multiple connections via USB RS232 conversion.
    Any ideas on how I can possibly use something else to set CTS to high when it detects voltage on a device.
    Thanks in advance.
  2. thingmaker3

    Retired Moderator

    May 16, 2005
    Steering diode?
  3. rhebert

    Thread Starter New Member

    Nov 4, 2007
    Thats the ticket - trying to over complicate things I guess.