Hitachi RAS-20CNHZ2 - Page 66

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● Fig. 2-1 shows the interface circuit used for the indoor and outdoor micro computers to communicate with
each other.
(Communications from indoor micro computer to outdoor microcomputer)
(Communications from outdoor micro computer to indoor microcomputer)
Fig. 2-1 Indoor / outdoor interface Circuit
MAIN P.W.B.
MAIN P.W.B.
POWER P.W.B.
INDOOR P.W.B.
OUTDOOR P.W.B.
IF RECEIVE
(SD1)
IF TRANSMIT
(SD0)
MICRO
COMPUTER
(AX-7M12)
IF CLOCK
IF RECEIVE
(SDI1)
IF TRANSMIT
(SD01)
MICRO
COMPUTER
(AX-6M00)