LEGRAND DAKER DK Plus 5 kVA Manuel D'installation page 64

Only one communication interface at a time can control the UPS, according to the following priority:
1) optional interface card;
2) USB;
3) RS232.
The following figures show the pinout of the RS232 and USB interfaces:
It is possible to download some free of charge software from the website http://www.ups.legrand.com
The software can be used for the following functions:
- display of all the operations and diagnostic data in case of problems (UPS Communicator);
- setup of special functions (UPS Setting tool);
- automatic shutdown of the local computer (UPS Communicator).
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Pin 3: RS-232 Rx
Pin 2: RS-232 Tx
Pin 5: Ground
Pin 1: VCC (+5V)
Pin 2: D-
Pin 3: D+
Pin 4: Ground
4 Operation