Terminal Resistor Setting - Fujitsu Airstage J-II Series Design & Technical Manual

1-6. TERMINAL RESISTOR SETTING

Be sure to set the terminal resistor according to specifications.
Set the terminal resistor for every network segment (NS).
● If terminal resistor is set in multiple devices, the overall communication system may be
damaged.
● If terminal resistor is not set in a device, abnormal communication may occur.
● Be sure to set one terminal resistor in a network segment. You can set the terminal resistor
„
at the outdoor unit or signal amplifier.
● When setting the terminal resistor of a signal amplifier, refer to the installation manual of the
„
signal amplifier.
● When setting multiple terminal resistors, take note of the following items.
„
 How many network segments are there in a VRF system?
 Where will you set the terminal resistors in a network segment?
(Condition for 1 segment: Total number of outdoor and indoor units and signal amplifiers
is less than 64, or the total length of the transmission line is less than 1,640 ft. (500 m))
 How many outdoor units are connected in 1 Refrigerant system?
● From conditions  -  , set outdoor unit DIP switch SET5-4 in accordance with the table
„
below.
DIP SW SET5-4 Terminal resistor
OFF
ON
„ SETTING EXAMPLE
„
Terminal resistor : ON
Slave2 Slave1 Master
Terminal resistor : OFF
Slave2 Slave1 Master
Slave2 Slave1 Master
Terminal resistor : ON
NS2 (Network segment 2)
CAUTION
Remarks
Disable (Factory setting)
Enable -
NS1 (Network segment 1)
Refrigerant system1 (Heat Recovery system)
Refrigerant system2 (Heat Recovery system)
Refrigerant system3 (Heat Pump system)
NS3 (Network segment 3)
- (07 - 55) -
About the setting of
terminal resistor
Outdoor unit (Master unit)
:ON
:OFF
Signal amplifier
Install
Do not install
NS4 (Network segment 4)