Need help figuring out obj:attachCoupler

So I found this callback in beamstate.lua, and need help deciphering it:

Code:

Original:
obj:attachCoupler(val.cid, val.couplerTag or '', val.couplerStrength or 1000000, val.couplerRadius or 0.2, val.couplerTargets or 0)

Mine:
obj:attachCoupler('IntTruck', 'IntTrailer', 1000000, 0.2, 0)

I'm pretty sure I have the wrong arguments, but it isn't crashing the game, so that's a plus.

EDIT: The correct syntax would be:

Code:

obj:attachCoupler(val.couplerID (numerical), val.couplerTag (string), val.couplerStrength, val.couplerRadius, val.couplerTargets)

So this would be a correct function:

Code:

obj:attachCoupler(243, '', 1000000, 0.2, 0)

Thanks to @thomatoes50 for the clarification.

 

Ok, that answers my question, thanks.