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EIA RS-232 Buffered breakout box circuit

2017-08-15 06:35  
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The Model 600 EIA RS-232 Breakout Box Interface Analyzer is used at the standard EIA RS-232 or CCITT V.24 data interface of modems, multiplexers, terminals, and computers. Model 600 provides access to and monitoring of all data, timing, and control signals.The monitoring circuit consists of four tri-color LEDs driven by an equal number of op amps configured as gain-of-one inverting amplifiers. Each LED is wired in the circuit so that it glows red when the input to the op amp is high, and green when the input is low. The LED remains off when the input is disconnected from a circuit, when it's at ground potential, and when it's connected to a 3-state output that's in the high-impedance state. Each input has an impedance of 10,000 ohms preventing the circuit.from loading communication lines. The op amp requires both positive and negative supply voltages to properly drive the LEDs. Both voltages are supplied by a single, nine-volt battery. The battery supplies the positive source directly. The negative source is supplied via aCMOS  555 oscillator/timer that's configured as an astable oscillator, which is used to drive a standard diode/capacitor voltage doubler. The use of CMOS op amps reduces quiescent current drain considerably.The Ocean Optics Breakout Box (HR4-BREAKOUT) is a passive module that separates the signals from their 30-pin port to an array of standard connectors and headers, enabling easy access to a variety of features found in Ocean Optics’ HR2000+, HR4000, USB4000 (with USB-ADP-BB adapter), and QE65000 Spectrometers.

Buffered breakout box