Hitachi Summit RAC-18YH6, Service Manual, Page: 43 / 96

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(1)Outdoor message
Serial Communications Data
Character No.
Bit No.
Contents
Data
Character No.
Bit No.
Contents
Data
(2)Indoor message
1/0
Operation mode(0 LSB)
Operation mode(1)
Fan(0 LSB)
Fan(1)
Fan(2 MSB)
2-way valve
Reversing valve
Quick heating
Main power ON request
Operation mode(2 MSB)
Indoor in-operation bit
Capacity code(0 LSB)
Capacity code(1)
Capacity code(2)
Capacity code(3 MSB)
During forced operation
Defrost request signal
Self-diagnosis(1)
Self-diagnosis(0 LSB)
Outside temperature(0 LSB)
Actual compressor rotation speed(0 LSB) Compressor command speed(0 LSB)
Compressor minimum rotation speed(0 LSB)
Compressor minimum rotation speed(1)
Compressor minimum rotation speed(2)
Compressor minimum rotation speed(3)
Compressor minimum rotation speed(4 MSB)
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)
OVL up
Indoor new communication bit
Compressor ON
Actual compressor rotation speed(1)
Actual compressor rotation speed(2)
Actual compressor rotation speed(3)
Actual compressor rotation speed(4)
Actual compressor rotation speed(5)
Actual compressor rotation speed(6)
Actual compressor rotation speed(7 MSB)
Outdoor new communication bit
Rotary reversing valve being ON
Fast feed 1/1000 for commercial test
Fast feed 1/10000 for commercial test
Outside temperature(1)
Outside temperature(2)
Outside temperature(3)
Outside temperature(4)
Outside temperature(5)
Outside temperature(6)
Outside temperature(7 MSB)
Fan-7-step request
Self-diagnosis(3 MSB)
Self-diagnosis(2)