GT Power Sound Unit / FrSky SBUS receiver?

[m4inbrain]

Hey there, sorry if it's an immediate obvious question to someone who has a bit of experience with FrSky stuff - i have not (yet), trying to understand a few things that aren't mentioned in manuals etc. 

So, the idea is to order a Truck kit, a GT Power 60A Sound Unit, as well as an FrSky X20. I'm currently trying to figure out what kind of receiver i need, the manual of the GT Power unit explains (in somewhat broken english) that the unit itself has Ch1-4 as PWM outputs, as well as one SBUS/PPM port. The pinout for that is +-S, like a servo wire. Now, as i understand it (and please correct me if i'm wrong, i'm new to all this), this SBUS port from the GT Power unit goes to an SBUS capable receiver. My main issue, and the issue i have trouble wrapping my head around, is that there's multiple things like FPort, SPort etc. 

Now, i did find a convenient receiver - tiny, light and cheap - the Archer M+. The "pinout" on that is SBUS Out, SPort, +-. The confusing part is this, i've seen other receivers with SBUS In etc, so.. How does this work? 

I assume that a straight servo connection lead won't work, so lets instead assume i'd take a servo lead, cut the connector off the receiver side and solder straight to the receiver pads. + to +, - to -, and SBUS Out to "SBUS" on the GT Power unit. Would that do the trick, or am i being stupid? 

I'm sorry if this should be immediately obvious, after reading so much stuff about so many different radios (trying to decide between Paladin, EthOS radios, OpenTX, different receiver protocols and all the other stuff) i just got lost now.