RS-232
RS (Recommended Standard) - 232 is a standard for serial binary data interconnection. It is commonly used in computer serial ports.
RS-232 also has relatively poor control of signal rise and fall times, which leads to crosstalk problems.
RS-232 is good for short connections below 15 meters. Because of the unbalance circuits, RS-232 interface cables are usually not constructed with twisted pair.
The usage of unbalanced circuits is responsible for RS-232 being susceptible to problems due to ground potential shifts among two devices.
