Modbus interface
Installation Manual
(2) Check the communication status between Modbus Interface and outdoor unit with LED5.
Check that the communication between Modbus Interface and each outdoor unit
connected is normally performed by selecting an outdoor unit using SW1 to SW3.
Confirming procedure:
• Set bit2 of SW3 to “ON” during normal operation.
• Set the line address of the target outdoor unit with SW1 and SW2.
Set SW1 and SW2 according to the table below, titled “Line address of outdoor unit and SW1/SW2 setting”.
• Communication status is displayed by LED5.
• The protocol for communication with an outdoor unit is displayed by LED4.
13
0
C
29
1
C
45
2
C
61
3
C
14
0
D
30
1
D
46
2
D
62
3
D
15
0
E
31
1
E
47
2
E
63
3
E
16
0
F
32
1
F
48
2
F
64
3
F
65
4
0
81
5
0
97
6
0
113
7
0
66
4
1
82
5
1
98
6
1
114
7
1
67
4
2
83
5
2
99
6
2
115
7
2
68
4
3
84
5
3
100
6
3
116
7
3
69
4
4
85
5
4
101
6
4
117
7
4
70
4
5
86
5
5
102
6
5
118
7
5
71
4
6
87
5
6
103
6
6
119
7
6
72
4
7
88
5
7
104
6
7
120
7
7
73
4
8
89
5
8
105
6
8
121
7
8
74
4
9
90
5
9
106
6
9
122
7
9
75
4
A
91
5
A
107
6
A
123
7
A
76
4
B
92
5
B
108
6
B
124
7
B
77
4
C
93
5
C
109
6
C
125
7
C
78
4
D
94
5
D
110
6
D
126
7
D
79
4
E
95
5
E
111
6
E
127
7
E
80
4
F
96
5
F
112
6
F
128
7
F
Communication status with outdoor unit
LED5
Remarks
Normal
Lighting Modbus interface is in communication with the outdoor unit.
Error Blinking Communication with the outdoor unit was established
previously, but is disabled currently.
Invalid outdoor unit
Light off Communication with the outdoor unit has never been
established.
Protocol for communication with
outdoor unit
LED4
Note
In communication via Uh Line
On
When Modbus interface is performing communication with
the relevant outdoor unit via Uh Line.
In communication based on old
communication protocol
Blinking
When Modbus interface is performing communication with
the relevant outdoor unit based on old communication
protocol.
(Example)
Check the communication status of outdoor unit with line address of 10.
Set bit1 of SW3 to “ON”, SW2 to “8” and SW1 to “9”.
Indoor unit
central control
address
SW2 SW1
Indoor unit
central control
address
SW2 SW1
Indoor unit
central control
address
SW2 SW1
Indoor unit
central control
address
SW2 SW1
18-EN
