Ahh I see thanks John, I was just curious, I seen an article in a photo mag that talks about a cheap one light setup using a pc cord and haven't seen many people talk about them, its always the hotshoe 2.
There are all sorts of posts on this forum about PC cords.
That would be the "standard" setup for almost anyone using a studio flash setup.
But, the Canon Speedlights and Sigma Super will require an adapter to allow you to connect a PC cord (unlike many garden variety flash units like the Vivitar 283).
I am not aware of the particulars of the Metz 54, but Metz typically has very robust compatibility options. It is very likely it will accommodate a PC cord, either intrinsically, or with an adapter (possibly supplied when purchased, as a PC cord would be the most fundamental use mode).