¢
Component location of PCB
Modbus Network
connection port
VRF Network
connection port
Modbus
terminal
resister switch (SET7-4)
VRF terminal resister
switch (SET2-1)
Test run switch (SET2-3)
Scan switch (SET2-4)
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)
Convertor address
switch (SET1)
USB cable connector
¢
Electrical wiring
Modbus cable
L (L1)
N (L2)
General purpose building
control computer
(Modbus Device)
Indoor unit
Transmission cable
Outdoor unit
Master or Slave
Outdoor unit
Power supply
cable
Transmission cable
to Modbus network
Transmission cable
to VRF network
Modbus convertor
1
Ø
50/60 Hz
208-240 V
(Disconnect switch)
Switch
Fuse (2 A)
Power supply cable
¢ 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)
- (05-155) - 3. Adaptor/Convertor units
CONTROL
SYSTEM
CONTROL
SYSTEM
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