Yes, it works, BUT you will need to fit it with a suitable connector to fit the Combro. I soldered on a standard 3.5mm stereo jack plug to suit my F1 Chrony, and it works perfectly.

Keep in mind that this is on my Chrony, not a Combro. Looking at the Combro info the serial communications runs at 0 to 5v, which means it SHOULD be TTL. Robin will be able to confirm that.