Fujitsu AJ 126LELDH Series Design & Technical Manual page 655

¢ Component location of PCB
Modbus Network
connection port
Modbus terminal
resister switch (SET7-4)
Modbus communication
baud rate switch (SET6-4)
Modbus communication
parity switch (SET6-3)
Modbus communication
stop bit switch (SET6-2)
Modbus slave address
switch (SET4/SET5)
¢ Electrical wiring
¢ Functions
• Indoor unit control
– Individual control
Commands from Modbus network are sent to the respective indoor units.
(Modbus network → respective indoor units of VRF network)
– Batch control
Commands from Modbus network are sent to all indoor units connected to VRF network.
(Modbus network → All indoor units of VRF network)
• Indoor unit status monitoring
Indoor unit status is communicated to the Modbus network in the form of Lon network variables.
(Modbus network ← All indoor units of VRF network)
3-7. Modbus converter for VRF (UTY-VMGX)
USB cable connector
General purpose building
Indoor unit
Transmission cable
Outdoor unit
Master or Slave
Outdoor unit
Power supply
Transmission cable
to VRF network
1 Ø 50/60 Hz
208-240 V
control computer
(Modbus Device)
Modbus cable
L (L1) N (L2)
Modbus convertor
cable
Transmission cable
to Modbus network
- (05-155) -
VRF Network
connection port
VRF terminal resister
switch (SET2-1)
Test run switch (SET2-3)
Scan switch (SET2-4)
Convertor address
switch (SET1)
Switch
(Disconnect switch)
Fuse (2 A)
Power supply cable
3. Adaptor/Convertor units