Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: Does the Yongnuo RF-603C II work with a Canon 6D, or a 580EX flash? I can't make them work. Wrong contacts?
Document: These wireless flash triggers work great and are much less expensive than other brands. I use them with my Canon cameras and flashes without any issues. I also have several of the Yongnuo 560-III flashes with built in receiver and they work every time. You can't go wrong for the price!
I have a set of the original version of the Yongnuo RF-603 triggers. The addition of a functional &#34;test&#34; button to this version II for measuring light with a light meter made it worth buying for me. Works great with the build in triggers in my Yongnuo 560 III flashes.Highly recommend this trigger for simplicity of use and reliabilty. I haven't had a single misfire with this set or my old set of the version ! triggers.
I like to use a small optical slave in conjunction with the pop-up flash of my Powershot S90 to do radio off-camera flash triggering sometimes (I'm just weird that way), and it works fine with my RF-602s (which are old enough to still have the PC input port on the Tx unit). Couldn't get it to work. And the manual that came with the triggers describe the PC port as an output only (just like on the Mk I 603s).
I purchased these because I wanted to use OFC with my Fuji X system cameras (x100 and the x-e1)...I read that the canon hot shoe arrangement was similar and that these would work fairly well.Well they worked GREAT. So much so that I purchased another set for my NIKON rig as a backup to my PHOTTIX ODIN radio trigger set.Mind you, I can't sync past 1/160 of a sec but for simple shoots and my home studio projects it's more than usable.
These triggers paired with 2 Vivitar 285HV flashes and 4 Yongnuo 560 III flashes make for a light and versatile location lighting kit for me.
Its a very simple and easy to use radio trans-receiver, I had a Yn-560III and canon 270 Ex flash that I wanted to use for my son's second bday party, the flash trigger was perfect, I took some 500+ shots and all were lit excellent...
My RF-602 triggers are aging and that CR2 battery is a real PITA, so I thought I'd try picking up a set of the RF-603II triggers not only for the numerous improvements (locking ring, on/mode switch on the SIDE of the unit, the test button working in hand, etc.) but because these would be compatible without modification with my micro four-thirds camera (Panasonic G3). Worked great out of the box on both my Canon and Panasonic cameras.But.
These little RF Triggers work fantastic. NO ETTL. Just manual triggering.
Have tried to order these before and a different company sent the wrong model...or then I tried a different brand and they misfired more than they worked. Finally I was able to get these and I am thrilled with them.
Got this to try out off camera flash. Had to read the manual before using this.It works like a charm and did not miss anything. Cheap and good for beginners.Only problem I had was reading the manual which was a little hard to understand at times.
Answer: It should work, you may have to set the 580Ex to manual and set the RF603 swtich on 580Ex to TRX and RF603 switch on 6D to Tx/TRx