[Stefan Fox]

Hi Richard,

Yes it is possible to make one (we use one all the time), all the info you need is in this thread.

But be aware that even with the latest updates the Videohub will crash(stop communicating over RS422), unless you have Ref In disconnected.

Regards,
Stefan.

[Stefan Fox]

Hi Alan,

We built our own controllers based on BlackMagic’s RS422 protocol, and the only problem now is that the VideoHub will stop communicating after a while when you have the Ref in connected (Genlock).

So as a work aroung we disconnected this from the VideoHub, and it works as it should.

I see there is an update for the VideoHub, so this ‘might’ solve the problem. When I have some time I will see if it does.

Stefan.

[Stefan Fox]

Hi Fredric,

‘What kind of a device did you build to make it work?’

We built an interface between the touchdowns and the Video Hub based on a microcontroller.

Using these protocols:
https://www.blackmagic-design.com/media/1388225/VideohubManual.pdf
p82

Also reading the Leitch Serial Pass-Through Protocol (Section 4) will help.

‘I’m interested to know if you solved the problem?’
This is something that Blackmagic is working on, but if you don’t use the ‘Ref in’ it will work well.

Regards,
Stefan.

[Stefan Fox]

Hi Bob,

The Compact Videohuub has a dedicated RS-422 port ‘for custom crosspoint control'(it doesn’t have any for VTR control).
It runs on the Leitch Serial Pass-Through Protocol (https://www.leitch.com/custserv/doclib.nsf/55f584d47a8fd27585256bf300554e9f/607933f430bc5cae85256e9300736b4f/$FILE/SPR_manual.pdf)
See section 4

So with this 422 port you can sent commands to the videohub to control the routes, get route states, ect.

The RCP’s we mainly use is the Sony RCP750 (https://www.tnpbroadcast.co.uk/sony-rcp750-remote-control-panel-p-657.html), but it doesn’t really matter as I think all touchdown controls on any RCP is just a closing contact relay.

So all our device does is when you press the touchdown, it sends a command to the video hub to see which source the particular destination is set to (and stores it in memory for later). Then it sends another command to tell it to switch to the source the RCP is controlling. When you let go of the RCP it tells the videohub to switch back to the source stored in memory.

Nothing too dificult.

Thanks,
Stefan.