Hitachi RAC25NH4, Service Manual

Page: 63 / 115

– 73 –
[ Serial Communications Data ]
7
1/0
6
1/0
5
1/0
4
1/0
3
1/0
2
1/0
1
1/0
0
1/0
7
1/0
6
1/0
5
1/0
4
1/0
3
2
1
0
7
6
5
4
3
2
1
0
7
6
5
4 0
3
1/0
2
1/0
1
1/0
0
1/0
Character No.
Bit No.
Data
0
0
0
1/0
1/0
1/0
0
1/0
0
0
1/0
1/0
1/0
1/0
1/0
OVL up
Compressor command speed (0 LSB)
Compressor ON
Reversing valve
2-way valve
Fan (2 MSB)
Fan (1
Fan (0 LSB)
Capacity code (3 MSB)
Capacity code (2)
Capacity code (1)
Capacity code (0 LSB)
Indoor in-operation bit
Operation mode (2 MSB)
Operation mode (0 LSB)
Contents
0
1
2
3
(2) Indoor message
Operation mode (1)
Compressor command speed (1)
Compressor command speed (2)
Compressor command speed (3)
Compressor command speed (4)
Compressor command speed (5)
Compressor command speed (6)
Compressor command speed (7 MSB)
15/20(A)
Compressor minimum rotation speed (4 MSB)
Compressor minimum rotation speed (3)
Compressor minimum rotation speed (2)
Compressor minimum rotation speed (1)
Compressor minimum rotation speed (0 LSB)
7 0
6 0
5 0
4 0
3 0
2 0
1 1
0 0
7
1/0
6
1/0
5
1/0
4
1/0
3
2
1
0
7
6
5
4
3
2
1
0
7
6
5
4
1/0
3
1/0
2
1/0
1 0
0
1/0
Character No.
Bit No.
Data
1/0
1/0
1/0
1/0
1/0
1/0
1/0
1/0
1/0
1/0
1/0
1/0
1/0
1/0
1/0
Fan-7-step request
Actual compressor rotation speed (5 MSB)
Actual compressor rotation speed (4)
Actual compressor rotation speed (3)
Actual compressor rotation speed (2)
Actual compressor rotation speed (1)
Actual compressor rotation speed (0 LSB)
Compressor during operation
Compressor during operation
Outside temperature (7 MSB)
Outside temperature (6)
Outside temperature (5)
Outside temperature (4)
Outside temperature (3)
Outside temperature (2)
Outside temperature (1
Outside temperature (0 LSB)
Self-diagnosis (3 MSB)
Self-diagnosis (2)
Self-diagnosis (1)
Self-diagnosis (0 LSB)
Defrost request signal
During forced operation
Multi-bit
Contents
0
1
2
3
(1) Outdoor message