Vertical speed access

[klaasjelle]

Hi

Currently I am using address &7F2 to read the vertical speed. Assigning another speed to this address is difficult because FS changes the value of it, without notice. For instance, if I climb FS will assign 1800 f/m in this adress. I can change it ( via my VB application) to 1900, 2000 and no more !

Do I use the wrong adress ? Should the changed value be sent to another adress ?

Is my way of working wrong ?

Regards

Klaas Jelle

[Pete Dowson]

Sorry for the delay in replying -- as mentioned in the Announcements above, my wife and I were off touring Argentina & Chile (by steam trains where possible) immediately after I returned to the UK from the AVSIM FanCon in Seattle.

Currently I am using address &7F2 to read the vertical speed. Assigning another speed to this address is difficult because FS changes the value of it, without notice.

Er07F2 contains the MCP-set V/S, to tell the A/P what vertical speed to attempt to attain. If you are only "reading" it what do you mean by "assigning another speed"?

FS does not change it without notice, it only sets it to the aircraft default VS when you enable an altitude change (or the Altitude value is set to other than the current reading when in Alt Hold mode). When attaining the set altitude the V/S is reset to zero.

For instance, if I climb FS will assign 1800 f/m in this adress.

Yes, 1800 is the default for the supplied aircraft. I'm pretty sure the default can be changed in the Aircraft.CFG files.

I can change it ( via my VB application) to 1900, 2000 and no more !

What do you mean "no more"? The V/S can be set to anything withing the limits for the specific aircraft. For instance for the Boeing airlines it is something like +6000 to -6000. There are many add-ons using and setting this, and, in fact, the panel gauges do the same.

Maybe you are setting it before setting the altitude hold and target altitude? You set those first, then adjust the V/S as you wish.

Regards

Pete