PYXIS SDI backward compatibility

The PYXIS has a 12G-SDI (up to 2160p60) port on the back. However, my Zacuto Gratical HD EVF only supports HD-SDI resolutions up to 1080p/60.

Can the PYXIS be set to downgrade its SDI-out signal to be compatible with my EVF? I have read the manual but don't have a lot of experience with SDI since my original BMCC so am not quite sure what I am reading!

Thanks for your help

I would think the Pyxis will include the options common in other BMD cameras that allow you to select 2160p or 1080p. It may be in the manual, but I haven’t finished reading it yet.

Edit
I checked the manual and you have the option to enable 1080p at all times; if the camera is recording 2160p, you can select either 1080p or 2160p for SDI Out.

The SDI standard implies backward compatibility.
The whole SDI circuit will slow down to the slowest device on the circuit. Think loopout... If you have an SDI monitor, SDI wireless transmitter, SDI EVF, etc. It will slow down to the rate of the slowest device.

The SDI standard implies backward compatibility.
The whole SDI circuit will slow down to the slowest device on the circuit. Think loopout... If you have an SDI monitor, SDI wireless transmitter, SDI EVF, etc. It will slow down to the rate of the slowest device.

That's not correct - SDI is a unidirectional standard - there is no way for a sink (i.e. display, vision mixer, recorder, capture card etc.) to signal what the maximum quality it can accept is (12G, 6G, 3G, HD, SD etc.) to a source.

If you have a 3G-SDI monitor and a device capable of 12G-SDI output, then you need to configure that device to output 3G-SDI, as it can't 'know' it's connected to a 3G-SDI display.

Also - beware not every device is backwards compatible. Increasing numbers of devices no longer support SD-SDI (i.e. the original 270Mbs version that carries 525/59.94 and 625/50 video) output (or input), and not every device supports every flavour of 3G-SDI (there are Level A and Level B variants of that standards - not everything does both)

(HDMI is different as it has a data channel from sink to source that carries format support information, called EDID)

You are correct that once an output format is set then loop-through and DA-ed versions of that signal will stay in the same format - but that's what you'd expect for any signal.

…and that’s what I get for reading 3 data sheets back to back the other day and not referencing back to it before responding… :p