According to the internet, you need a Remote Management module for this motherboard.
According to the motherboard specifications there are 2 options:
Out of Band Remote Management: ASMB3-SOL PLUS (V3) and ASMB3-iKVM
To give you an idea what it looks like, check out this link:
Here is the ASUS ASMB3-SOL :
So first check that you have that module, you can now even see where it should sit. If you don't have it, you can try and source it somewhere if the remote management is that important to you.