Trane CXAU - Centralized Controller with Touch Screen

Controller
31PKGP-SVX19A-EN
Centralized Controller Diagram
FG DC_ DC+ GND A+ B- GND A+ B-
COM2 COM4
L N V- V+
L N
AC 2V 50/60Hz
HMIPOWER
CN3
A B G
Host Unit
GND A+ B-
COM1
DB9
A B G
HOST COMPUTER
MODBUS RTU
Centralized Controller with Touch Screen
The centralized controllers can control up to 16 units.
Wiring Diagram of single-group centralized control systems
A bus can connect up to 16 modules (including host unit).
Max 16 OD units
RS485 Cable
RS485 Cable
MODBUS
RTU