Graupner GR-24 question

Don't know whether we have any Graupner experts on the forum but I've got a question:

I've got a single MX-20 and a pair of GR-24's, call them A and B -- they're mounted on two different Cinestar framesets. When I bind the MX-20 with A, everything's fine. The PPM/SUMO on channel 8 works fine (I can see that using MK Tool/Channels), but I can also plug in a servo cable on servo connector 5 on the A receiver to toggle screens on the the Smart On Screen Display (SOSD) -- so servo connector 5 is also producing PWM.

When I re-bind the MX-20 with GR-24 B, everything works fine (the PPM/SUMO drives the MK boards, MK Tool/Channels shows channel 5 changing value), but the output on servo connector 5 is a pulse chain that never varies in length -- it's PWM without any modulation. I've verified (using the MK Tool Channels) that in both cases channel 5 via is working correctly -- but the MK Tool/Channels display is derived from the PPM/SUMO output on the GR-24 channel 8 connector.

In case you're wondering how I know what the pulse widths are doing, I'm using an oscilloscope to check the waveforms.

So my question is: Is there something that you have to do to cause a GR-24 to both produce PPM/SUMO output on channel 8, as well as modulate pulse widths on the GR-24's physical channel connectors other than 8?

I've not checked the firmware versions but both were acquired around May of this year.....

Thanks
Andy.

 

Thanks, Josh. I'll do that after the shoots tomorrow and Thursday. Daren't upgrade the working GR-24's firmware just in case I brick it in the process. But, at least it sounds like there's not some setting that needs to be changed somewhere....

Andy.

 

Thanks, Tabb. I'll contact him and post what he says.

Andy.