Trane CXAU - Page 32

32
PKGP-SVX19A-EN
Controller
Customers can connect up to 16 centralized controllers by the host computer (the host computer needs to be controlled by
customers).
MODBUS.RTU
RS485.Communication
Max. 16 groups
Customer
host computer
MODBUS.RTU
RS485.Communication
RS485.Communication
Max. 16 units
Controller 1
Controller 2
Controller 16
● RS485 communication cables must use twisted pair shielded wire RVSP, and must not use other cables instead.
● The RS485 bus must be connected by hand-in-hand and must not use a star connection.
● RS485 communication cables should be as far away as possible from high-voltage wires, not parallel to power lines, and
cannot be tied together.
Wiring Diagram of host, slave, centralized controller
CN3
SW4 SW5
SW2
SW1
CN2
SW6
CN24
CN3
SW4 SW5
SW2
SW1
SW6
CN24
CN3
SW4 SW5
SW2
SW1
SW6
CN24
CN2CN2
A
B
GND Shielding layer
A
B
GND
A
B
GND
A
B
GND
COM2
Centralized
Controller
Unit 1(Host Unit) Unit 2(Slave Unit) Unit N(Slave Unit)