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  1. #1
    null null
    Guest

    pmSystems: 3-way switch handling

    Hi Folks,

    I'm 2/3 way finished implementing pmSystems in Photon/FSCockpit but have a
    question for cockpit builders.

    For switches that are 3-position e.g. APU start (OFF-ON-START) or L Pack
    (OFF-AUTO-ON) how do you typically wire these? Do you have toggle switches

    for which there are 3 active poles and a common ground or do you use an SPDT

    switch (center off)?

    I need to know how I should program for these functions. The first case is

    simply 3 different functions and each position is mapped to its own
    function. The second one requires logic that recognizes that a toggle to
    "off" signifies the center function (which is usually not "off" but "auto"
    or "on" ).

    So I need to get an idea of what most people are doing in order to code the

    most popular solution.

    Thanks!

    Scott L. Fausel, VMD
    Integrated Flight Systems
    http://www.iflightsystems.com


  2. #2
    Enrico Schiratti
    Guest

    Re: pmSystems: 3-way switch handling

    Hi,

    > I'm 2/3 way finished implementing pmSystems in Photon/FSCockpit but have

    a
    > question for cockpit builders.


    Damn! Send photos!

    > For switches that are 3-position e.g. APU start (OFF-ON-START) or L Pack
    > (OFF-AUTO-ON) how do you typically wire these? Do you have toggle
    > switches
    > for which there are 3 active poles and a common ground or do you use an
    > SPDT
    > switch (center off)?


    We might need to add a timer-controlled bit for that... there are not many
    switches like that and it shouldn't be too difficult to add.

    Ciao

    Enrico


  3. #3
    null null
    Guest

    Re: pmSystems: 3-way switch handling


    "Enrico Schiratti" wrote in message
    news:273677.54362@wb.onvix.com...
    > Hi,
    >
    >> I'm 2/3 way finished implementing pmSystems in Photon/FSCockpit but have

    > a
    >> question for cockpit builders.

    >
    > Damn! Send photos!


    If only I meant my own cockpit - afraid I'm talking about the software
    for my interface system

    >
    >> For switches that are 3-position e.g. APU start (OFF-ON-START) or L Pack
    >> (OFF-AUTO-ON) how do you typically wire these? Do you have toggle
    >> switches
    >> for which there are 3 active poles and a common ground or do you use an
    >> SPDT
    >> switch (center off)?

    >
    > We might need to add a timer-controlled bit for that... there are not

    many
    > switches like that and it shouldn't be too difficult to add.


    I've tentatively programmed these as if they are a standard center-off SPDT

    switch. Each "on" position is mapped to a different input. The functions
    for these inputs detect a toggle and then branch based upon "toggle on" or
    "toggle off." I just make "toggle off" for both of the ports the center
    function, whatever it is e.g. "Auto." I think this will be the simplest
    solution and you get 3 positions for the price of 2 .

    A timer controlled bit for spring-loaded positions would be good in case
    people forget to toggle back with a standard switch.

    Thanks,

    -Scott


  4. #4
    null null
    Guest

    Re: pmSystems: 3-way switch handling

    On Wed, 01 Dec 2004 23:28:47 EST, Scott
    Fausel wrote:

    >Hi Folks,
    >
    >I'm 2/3 way finished implementing pmSystems in Photon/FSCockpit but have a


    >question for cockpit builders.
    >
    >For switches that are 3-position e.g. APU start (OFF-ON-START) or L Pack
    >(OFF-AUTO-ON) how do you typically wire these? Do you have toggle switches


    >for which there are 3 active poles and a common ground or do you use an SPDT


    >switch (center off)?


    Hi Scott
    You need to use a DPDT toggle switch that has a On - On - On
    configuration

    They can be wired:

    on - off - on
    on - on - off
    off - on - on
    on - on - on

    David
    www.737FlightSim.com


  5. #5
    null null
    Guest

    Re: pmSystems: 3-way switch handling


    Hi Scott
    I forgot to provide a part number
    MS27407-4 or Microswitch 2TL1-10 will give you a idea how the are
    wired.

    David
    www.737FlightSim.com

    On Thu, 02 Dec 2004 16:57:19 EST, David Allen
    wrote:

    >On Wed, 01 Dec 2004 23:28:47 EST, Scott
    >Fausel wrote:
    >
    >>Hi Folks,
    >>
    >>I'm 2/3 way finished implementing pmSystems in Photon/FSCockpit but have a


    >
    >>question for cockpit builders.
    >>
    >>For switches that are 3-position e.g. APU start (OFF-ON-START) or L Pack
    >>(OFF-AUTO-ON) how do you typically wire these? Do you have toggle switches


    >
    >>for which there are 3 active poles and a common ground or do you use an

    SPDT
    >
    >>switch (center off)?

    >
    >Hi Scott
    >You need to use a DPDT toggle switch that has a On - On - On
    >configuration
    >
    >They can be wired:
    >
    >on - off - on
    >on - on - off
    >off - on - on
    >on - on - on
    >
    >David
    >www.737FlightSim.com



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