Salda AMBERAIR COMPACT S-CX H Operation, Installation & Maintenance Instructions page 8

X18 MCB connector is for the Remote controller.
X19 MCB connector is for BMS.
S1 DIP switch is for X19.
Switch
S1
8 | EN
Position
1
2
3
Purpose
120 Ohm termination load (On/Off)
1 kOhm RS line pull-up (On/Off)
1 kOhm RS line pull down (On/Off)
AMBERAIR COMPACT S-CX v2023.3