Dell 3750W Power Supply User Manual


 
55
Additional UPS Features
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Table 8. RS-232 Communication Port Pin Assignment
Pin
Signal Name Function Direction from the UPS
1 Unused
2 Tx Transmit to external device Out
3 Rx Receive from external device In
4 Unused
5 GND Signal common (tied to chassis)
6 Unused
7 Unused
8 Unused
9 Unused
*Unused pins must be left free on all models.