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ORIENTAL HUARAY GROUP LIMITED
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4.3. Selection of interface mode:
HR-1025 (V1.1) provides there types of interface mode, COM1 (Pin3 and Pin4 of
CON1) is fixed as UART
Serial port of TTL level: COM2 (Pin6 and Pin7 of CON1) can choose interface
mode (RS-232, RS485) through D of J1
(1). TTL interface connection application circuit