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Some server system-boards have an RS-485 port that can be used by the
Advanced System Management Processor to communicate with each other in
half-duplex mode .
(Netfinity 5500-M20 8662)
| PIN | Signal | 
|---|---|
| 1 | + 5 Vdc (Term Power) | 
| 2 | + Data Input (tied to pin 4) | 
| 3 | - Data Input (tied to pin 5) | 
| 4 | + Data Output (tied to pin 2) | 
| 5 | - Data Output (tied to pin 3) | 
| 6 | Ground | 
Please see the LEGAL  -  Trademark notice.
Feel free - send a 
  for any BUG on this page found - Thank you.