DELL J739N Manuel D’Utilisation

DELL

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.