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Hi, Does anyone know where to get a schematic for a HP iPAQ hx4700 audio in/out? I plan to use it as an Pocket Oscilloscope (Pocket multi-instrument 1.0) There is following info: google: Does HP 4700 have an input that can support an external microphone instead of the internal one? - The jack is dual purpose offering stereo
By design, RS232 is a point-to-point rather than a multidrop (bus) interface. Some instrument manufacturers use an extended RS232 interface with a tri-statable driver, e.g. MAX3323E. It can work in a multi-drop RS232 bus, if the "slaves" provide a separate TX-enable signal.
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