Pylontech Pelio-L-5.12 Operation Manual page 41

3) The module which LinkPort0 is empty will be the master
module (Module 1）and the communication cable to
inverter should be led out from this Module. After the
connection is completed, please check the cover at
both ends.
4) Connect the communication cable between master battery
stack (Module 1) and the inverter. Wire clips can be
used to secure the wires too. Tighten the communication
port after all of the above set up. Check the waterproof
plug on the empty port and make sure all the empty ports
are protected well.
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