s7 400 what communication cable to use?

Hi..I'm a newbie in the automation world...right now I am trying to communicate with my s7-400 with a USB/PPI multi master cable.. But i can't communicate my s7-400 to my PC.. i have a simatic manager software installed in my pc.. I tried to set the PG/PC interface but still, no luck...

Am I using the wrong cable? could someone help me? thank you in advance..^^

See link below for help getting the right cable.

http://www.plctrainer.net/PLCProgrammingCables.htm#Siemens

tnx mickey...i'll check it out..^^

S7-400 doesn't support PPI.
It's MPI for the first time, then either MPI or Profibus, depending on how the port is configured.
Another way would be ethernet, but that's depending on the setup.

tnx jeebs..appreciated//^^