DELL 1920W User Manual
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57
Additional UPS Features
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Table 9. 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.