Quote Originally Posted by Vinny View Post
Hello Laith,

In order to rule out the possibility of that longer RJ11 cable being the cause, you would need to bring the fans close enough to test it out with the original cable.

Which 1-10v expansion card do you have installed in your P4?
The port numbering in the Expansion box (L1/L2, L3/L4) would start after the last number in the P4 w/Expansion card.
P4 on-board ports --> L1-L6 --> PLM-4L --> L7-L10--> EXB2 on-board ports --> L11/12 (L1/L2)...L13/14 (L3/L4)
Hello Vinny,

Yes, that's the expansion card I have in the P4 (PLM-4L, the one with two L ports). So without a Y splitter on L3/L4 of the Expansion Box whatever is connected in that port would be L13, if I understand correctly.

And I agree I need to test with the original cable. In order to do that I need to redo some cabling which I'm not looking forward to! :-)