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6.1. Wiring method
PROPER SYSTEM DIAGRAM
General-purpose
MODBUS master unit
(MODBUS device)
MODBUS Network
MODBUS Convertor
(UTY-VMSX)
Connector cable
MODBUS Convertor
(UTY-VMSX)
Connector cable
Maximum connectable indoor unit
number per 1 MODBUS Convertor
Maximum number of connected
MODBUS Convertor units to one
MODBUS master unit
* Due to the limit in the number of slave addresses
ELECTRICAL WIRING
General-purpose building
control computer
(MODBUS device)
MODBUS
CABLE
MODBUS CONVERTOR
Connector cable
to Indoor Unit
En-3
Lighting facilities
Security system
Automatic fi re
alarm interface
Ventilation system
Indoor unit
Indoor unit
1
31
Without repeater
247*
With repeater
INDOOR UNIT
CONNECTOR
CABLE
MODBUS cable
Note :
• Use shield cable for transmission cable.
• The shield metal should be earthed (grounded).
• Do not forget to earth (ground) the MODBUS Convertor.
6.2. Unit wiring
6.2.1. MODBUS cable
MODBUS connector
(Accessories)
Shielded cable
(no sheath)
Tightening torque for installing cables to MODBUS connector
0.22 to 0.25 N • m (1.9 to 2.2 lbf • in) (2.2 to 2.5 kgf • cm)
7. INSTALLING THE MODBUS CONVERTOR
Always use the accessories and specifi ed installation work parts. Check
the state of the installation parts. Not using the specifi ed parts will cause
units to fall off, electric shock, fi re, etc.
Install at a place that can withstand the weight of the unit and install
positively so that the unit will not topple or fall.
When installing this unit, make sure that there are no children nearby.
Otherwise, injury or electric shock could result.
Do not set the DIP switch or rotary switch of this unit except as specifi ed
in this installation manual or the instruction manual supplied with the
air conditioner. Setting the switches other than specifi ed will cause an
accident or trouble.
Use an insulated screwdriver to set the DIP switches.
Before opening the cover of this unit, completely discharge static
electricity charged on your body. Otherwise, failure or malfunction could
result.
Do not touch the circuit board and circuit board parts directly with your
hands.
Otherwise, injury or electric shock could result.
Tightening the mounting screws too tight will damage the body of this
unit.
Be careful so that the cover does not fall after the cover screws are
removed.
Otherwise, injury could result.
7 mm
15 mm
(1/4 in)
(9/16 in)
7 mm
15 mm
(1/4 in)
(9/16 in)
30 mm
(1-3/16 in)
WARNING
CAUTION
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