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  1. #1
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    Boeing SIOC code for vertical speed gauge ?

    Hello,

    can somebody help me getting the vertical speed gauge (http://www.opencockpits.com/catalog/....html?cPath=48) to work ?

    The code I found in the SIOC programm directory is not in alignment with the Gauge.

    Code:
    // *****************************************************************************
    // * Config_SIOC ver 1.97   -     By Manolo Vélez    -    www.opencockpits.com
    // *****************************************************************************
    // * FileName : a.txt
    // * Date : 4/4/2005
    // In this example, gauge have 4 sectors for positive and 4 sectors for negative values
    // In this example, gauge have 1020 steps, 510 for positive and 510 for negative
    // sectors are : 0-1000 = 150 steps, 1001-2000 = 100 steps, 2001-4000 = 160 steps and 4000-6000 = 100 steps
    // You need change those parameters for your gauges.
    
    
    Var 0010, Link FSUIPC_IN, Offset $02C8, Length 4, Type 1     // Vertical Speed
    {
      L0 = V0010 * 0.7895     // FSUIPC conversion, L0=VS
      L0 = ABS L0        // L0 not signed 
      L2 = L0
      IF L0 <= 1000     // First sector
      {
        L1 = L2 * 0.15     // (150 steps/1000 values) = 0.15
      }
      ELSE // Is a greater value
      {
        L2 = L0 - 1000   //  L2 only have values for next sector
        IF L0 <= 2000  // Second sector
        {
          L1 = L2 * 0.1     // (100 steps / 1000 values) = 0.1
          L1 = L1 + 150     // Add steps of others sectors
        }
        ELSE
        {
          L2 = L0 - 2000     // L2 only have values for next sector
          IF L0 <= 4000   // 3. Sector
          {
            L1 = L2 * 0.08     // ( 160 / 2000) =0.08
            L1 = L1 + 250   // Add steps of others sectors 150+100
          }
          ELSE
          {
            L2 = L0 - 4000     // L2 only next sector (Value-1000-1000-2000)
            IF L0 <= 6000   // 4. Sector
            {
              L1 = L2 * 0.05     // ( 100 / 2000) =0.05
              L1 = L1 + 410   // Add steps of others sectors 150+100+160
            }
            ELSE  // Out of range
            {
              L1 = 510         // Max. position
            }
          }
        }
      }
      IF V0010 < 0  // if vs is negative
      {
        V0000 = 511 - L1  // subctract from center
      }
      ELSE
      {
        V0000 = 511 + L1  // else add to center
      }
    
    }
    
    Var 0000     // Servo Motor
    Somebody get the gauge working with the correct sections for climb and descend ?

    Please advice,
    Thanks a lot,
    Markus
    best regards, Markus
    Boeing 737NG Home Cockpit: https://737cockpit.info

  2. #2
    150+ Forum Groupie pdpo's Avatar
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    Re: SIOC code for vertical speed gauge ?

    Hi Markus,

    as you can read in the script you need to adapt the script for you servo motor....
    So I would suggest you connect your servo motor, find out where the 0 point is, align this with the -xxx feet/min on the gauge, find then the number of steps it takes to get to + xxx feet/min on the gauge, then see where the 0 feet/min lies... and adapt the script accordingly

    Greetz Peter
    FS9+PM+AST+opencockpits

  3. #3
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    Re: SIOC code for vertical speed gauge ?

    Hello Peter,

    I am now a little bit confused. Is the gauge really showing the vertical speed, same as the PFD shows? Or is this a complete different system? I tried to find some information about this instrument, but I didn't found anything what is explainin the correct function for this.
    Do you know this?

    regards,
    Markus
    best regards, Markus
    Boeing 737NG Home Cockpit: https://737cockpit.info

  4. #4
    500+ This must be a daytime job
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    Re: SIOC code for vertical speed gauge ?

    Markus

    There are two separate issues here. The planes Vertical Speed Indicator shows the physical rate of climb/descent in relation to the ground. The Cabin Rate of Climb relates to the actual drop/rise in pressure within the cabin. The two are not the same. For example a plane climbs from 0ft altitude to 36,000 ft in 18 minutes - that is a vertical speed of 2,000ft per minute. However, the cabin is limited to an internal pressure equivalent to a height of 8,000 ft. I do not know the ratio of cabin pressure rise in relation to external pressure, however, assuming an operational ceiling of 36,000 and a linear internal increase; then whilst the plane rises at 2000ft per min the internal cabin pressure goes from 0 to 8000ft in 18 minutes which is equivalent to a Cabin Rise of 444ft per min.

    Given the above, it should be possible to code an approx simulation within SIOC

    David

  5. #5
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    Re: SIOC code for vertical speed gauge ?

    Thanks David for you explanation.
    I just found in the SimAvionics Server a variable called: AIR_CABIN_RATE
    maybe this is the right value to be triggered to the servo.
    I will have a look today what the value reports on climbing /descend.

    thanks,
    Markus
    best regards, Markus
    Boeing 737NG Home Cockpit: https://737cockpit.info

  6. #6
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    Re: SIOC code for vertical speed gauge ?

    I found a working code in the SimAvionics Forum.
    Thanks alot,
    Markus
    best regards, Markus
    Boeing 737NG Home Cockpit: https://737cockpit.info

  7. #7
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    Re: SIOC code for vertical speed gauge ?

    Plwase share the code if possible.

    Thanks!

    Ruediger

  8. #8
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    Re: SIOC code for vertical speed gauge ?

    Hi,

    here is the link to the code, as I am not sure if I can share the code directly here.
    http://www.sim-avionics.com/newforum...=2&t=395#p2082

    regards,
    Markus
    best regards, Markus
    Boeing 737NG Home Cockpit: https://737cockpit.info

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