GoFlight MESM IGN switch

[jclay13]

The GoFlight MESM 3-position toggle switch in the center of the board reports the following in FSUIPC:

 

IGN L = button 3 released

BOTH = button 3 pressed

IGN R = button 4 pressed

 

I want to use the 3-position switch to engage the starters and hold them in for a 2 engine jet (not auto start) like this:

Flip switch to IGN L - "Starter 1 Set" and hold it in

Flip switch to IGN R - "Starter 2 Set" and hold it in

BOTH - Do Nothing

 

It works good for IGN R where I configure the press as "Starter 1 Set" and "control to repeat while held".  The starter stays engaged until I flip the switch back to BOTH.

 

The challenge is IGN L.  I configure the release as "Starter 2 Set" and it engages if I flip from BOTH to IGN L.  But if I flip from BOTH to IGN R the button 3 release is triggered along with the button 4 press and both starters engage at the same time which is not what I want.  Plus I can't do a "control to repeat while held" on a release so it only engages it for a second.

 

I've also tried some creative things with key presses in FSUIPC in conjunction with GF Config key mappings and I can get IGN L to engage starter 1 and IGN R to engage starter 2 but the issue I run into there is it only engages the starter for a second and the key presses need to be held in until the engine starts.  It obviously works fine using a keyboard because I can hold in the mapped key.

 

Any ideas on this?  Thanks!

 

Jon.

[Pete Dowson]

The GoFlight MESM 3-position toggle switch in the center of the board reports the following in FSUIPC:

 

IGN L = button 3 released

BOTH = button 3 pressed

IGN R = button 4 pressed

 

 

 

Yes, that is how they look to FSUIPC. Of course BOTH is also "button 4 released" and IGN R is also "button 3 released".

 

I want to use the 3-position switch to engage the starters and hold them in for a 2 engine jet (not auto start) like this:

Flip switch to IGN L - "Starter 1 Set" and hold it in

Flip switch to IGN R - "Starter 2 Set" and hold it in

BOTH - Do Nothing

 

 

It would of course be far easier to do that if BOTH was buttons 3 and 4 released and the others both press actions instead.

 

Any ideas on this?  Thanks!

 

 

One way I can think of, which should work in both left and right cases, is this:

 

Program Button 3 release to set offset x0892 to 1. That's the 'ground' (start) position on the jet left engine starter. It's an unsigned word so use "Offset Word Set".

Program Button 3 press to set that offset back to 0 (the starter 'Off' position).

 

Similarly, for equal effect

 

Program Button 4 release to set offset x092A to 0. That's the 'off' position on the jet right engine starter. Also an unsigned word so use "Offset Word Set".

Program Button 4 press to set that offset to 1 (the starter 'Ground' position).

 

I think that should work okay, but I've not tried it here. Let me know.

 

Regards

Pete

 

[jclay13]

Thanks, I'll try that and let you know.  Can you help me understand the logic around IGN L not being a separate button?  I'm sure there is a logical reason and was wanting to know how it works.  I also see that GRD and OFF are the same button.

[Pete Dowson]

Can you help me understand the logic around IGN L not being a separate button?

 

If there are less bits used to encode the state of something you can fit more states in. This is 2 bits instead of 3.

 

Pete