High speed RC-232 interface with opto-isolator. Scheme, description

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High speed RC-232 interface with opto-isolator. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Radio amateur designer

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When signals from an isolated source are fed to a receiver powered by a different voltage, coupling circuits with low distortion and good noise immunity become necessary. Unfortunately, such schemes reduce the data transfer rate. True, if the General Instrument MCT232 opto-isolator with two phototransistors is used to isolate the RS-66 interface, then it is still possible to work at a relatively high speed - 9600 bps.

Fig.1 (click to enlarge)

The RS-232 interface (see part of Figure 1) with optical isolation uses MCT66, two diodes, an inverter and a resistor. If instead of transistors Q1 and O3 we take resistors by connecting them to the positive pole of the power source, then the duration of the signal fronts will become longer, and the transmission rate will not exceed 1200 bps. This limit depends on the resistance of the resistors and the length of the interface cable. However, if the resistances of the resistors are less than 1 kΩ, the power dissipation will become unacceptable.

In addition to the fact that this circuit allows you to achieve high data transfer rates, the polarity of its signal can be changed without introducing another inverter, but by turning on transistors Q1 and Q2 or Q3 and Q4 in a different way (diagram 2).

High speed RC-232 interface with opto-isolator
Ris.2

Author: Vojin G., Oklobdzija; Publication: N. Bolshakov, rf.atnn.ru

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