LG PACP4B000 Installation & User Manual page 19

The maximum quantity of connected indoor unit is different depending on the quantity of
connected I/O modules.
Please refer to following information related to product connection quantity.
Quantity of
Device
256
128
* Devices: Indoor units, ERV, DI/DOs, DOKITs, AWHPs, AHUs
• RS-485 communication cable connection
There is a polarity in RS-485 communication cable connection, so be careful not to reverse the
connection of the two cables.
Do not let the length of RS-485 communication cable exceed total of 1 Km.
RS-485 communication cable must be connected with BUS type.
• IP address of the ACP IV
IP address of the ACP IV, address of Gateway, and Net mask must be requested to the person
in charge of the network of the corresponding site.
CAUTION
RS-485 Connection of the ERV equipment
To connect ERV equipment, it is recommended to use the ports other than RS-485
communication ports which are connected to air conditioners.
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Quantity ofI/O Module
Installing ACP IV
Quantity of Quantity of
I/O Module Device
0 256
1 248
2 240
3 232
4 224
5 216
6 208
7 200
8 192
9 184
10 176
11 168
12 160
13 152
14 144
15 136
16 128
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