RS422 transmitting-receiving bidirectional monitoring circuit

The invention relates to a RS422 transmitting-receiving bidirectional monitoring circuit. The RS422 transmitting-receiving bidirectional monitoring circuit comprises transmitting-receiving chips U1-U4, and control triodes Q1 and Q2, wherein a pin A and a pin B of the U1 are connected to a positive e...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	SHANG ZHENHUA, SHANG TONG, TONG HONGBO, WANG FUSHENG, MAO YUANNI, ZANG XIYU
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	BROADCAST COMMUNICATION ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY PICTORIAL COMMUNICATION, e.g. TELEVISION
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Beschreibung
Zusammenfassung:	The invention relates to a RS422 transmitting-receiving bidirectional monitoring circuit. The RS422 transmitting-receiving bidirectional monitoring circuit comprises transmitting-receiving chips U1-U4, and control triodes Q1 and Q2, wherein a pin A and a pin B of the U1 are connected to a positive end and a negative end of a signal transmitting party respectively; a pin RO of the U1 is connected to a pin DI of the U3; a pin RO of the U1 is connected to the base electrode of the Q1 through a current limiting resistor R1; the collector electrode of the Q1 is connected to a pin RE# and a pin DE of the U3; a pin A and a pin B of the U2 are connected to a positive end and a negative end of a signal receiving party; a pin RO of the U2 is connected to a pin DI of the U4; a pin RO of the U2 is connected to the base electrode of the Q2 through a current limiting resistor R2. According to the invention, a TTL (Transistor-Transistor Logic) signal is divided into two portions for treatment, one portion serves as a commun