LG BNU-BAC Installation & Owner's Manual page 72

Objects (Modbus-TCP)
Local Definition of Object ID - The instance number is a pair, this consists of the indoor unit No. and item.
19
Address
Object Type
* Object Type (Coil : 0, Register : 4)
* Product Type (Indoor : 0, Vent 4)
** Device : Group of Product units (16EA)
72 Modbus
16 15
15 12
Product Type
Instance Number
11 8
Device No.
(from 0 to 16)
0
7 4
Product Unit No.
(from 0 to 16)
3 0
Point No.
(from 0 to 16)