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Idiomas disponibles
Table 5.8 Communication mode
IDU and ODU type
All IDUs and ODUs are JR8(V) series
At least one IDU or ODU is not JR8(V) series
Table 5.9 Communication wiring material
Communication mode
RS-485 (P Q E) communication
RS-485 (P Q) communication
RS-485 (P Q) communication wiring configuration
L1+La+Ln≤1200m.
Communication wiring 2*0.75mm
Breaker
Master ODU
Q
P
P
L1
CAUTION
After the last indoor unit, the communication
wiring should not route back to the outdoor
unit as this will form a closed loop.
In the last indoor unit, connect a resistor of
120 ohms between the P and Q terminals.
Do not bind the communication line,
refrigerant piping and power cable together.
When the power cable and communication
line are laid in parallel, the distance between
the two lines must be 5cm or more to
prevent signal source interference.
All IDUs in a system must be powered
through a uniform power supply so that they
can be powered on or off at the same time.
All communication lines of the IDUs and
ODUs must be connected in series, use the
shielded wire, and the shield layer must be
grounded.
The communication wiring (P, Q) must
through the magnetic ring from the main
board to the IDUs.
Communication protocol
JR8(V) communication protocol
Non-JR8(V) communication protocol
Type of wire
PVC-sheathed
copper-core flexible
shielded cable
PVC-sheathed
copper-core flexible
shielded twisted pair
2
N L
Distribution box
1# IDU
···
2-(n-2)# IDU
Q L
N
La
43
Optional communication mode
between IDU and ODU
RS-485 (P Q) communication
RS-485 (P Q E) communication
Number of cores and
wire diameter (mm
)
communication line (m)
2
3х0.75
2х0.75
Distribution box
(n-1)# IDU
Q L
P
N
Ln
Main control board
E
P
Q
Connect to the ODU PQ
Total length of
L≤1200
L≤1200
Communication wire
Power wire
n# IDU
Q L
P
N
Resister
Figure 5.44
Shield layer must
be grounded
Figure 5.45
V.1
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