Computer RS-23Z serial interface current loop circuit

This circuit is used in computer RS-232 serial interface and current loop circuit interface, it can transform voltage singal into 20mA current singal, the maximum transmission rate is 1200 bits. CCD IC1, T1 form receiver interface circuit, T2, T3 constitute transmitter interface circuit. When adds +12V, T2, T3 are conduction, the current outflows from T2..

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