theboginator, yes, I was referring to the specific SLC wiring guide’s method of testing resistance like you mentioned, so the wiring seems good.
And thanks for the helpful explanation about DC voltage readings. I thought the signalling was AC pulses superimposed on 24 V DC, so didn’t realize it would distort the readings that much, and since the modules are rated at 15 - 32 VDC, I thought this panel might have been too low based on what someone said on another forum.
So thanks for the clarification!