M.Hockings wrote:
Caution: Use only factory supplied or authorized UPS monitoring cable!
I seem to recall amonst the stuff for NUT there was instructions for making cables for different UPS's but it has been a while since I've looked at it.
Nothing that sounds Belkin-specific, but... http://us1.networkupstools.org/cables/
In general many UPS cables are -not- wired like a standard serial cable.