DB-25
D-Sub-9 or D-Sub-25
DB-25 D-Sub-9 or D-Sub-25
DB9 is a connector, not a cable. It is most commonly used for RS-232 serial connections like an external modem.
The 232 doesn't stand or come from anywhere. It's just a reference number. RS-232 = Recommended Standard 232
RS-232
You need to get a Bluetooth RS-232 dongle, which connects to serial RS-232 port and provides bluetooth connectivity. These are similar to USB bluetooth devices to some extent, but need a power source for the electronics circuitry (as you may be aware that USB ports have 5V power supply but RS-232 standard has no option for power supply on the connector). So Serial port to Bluetooth convertors will have either an inbuilt battery or a power supply connector to feed power. Here are examples : http://www.lemosint.com/scripts/bluetooth_parani_sd.asp http://serialio.com/products/adaptors/BlueSnapXP.php - Neeraj Sharma
The "RS" in RS-232 stands for "Recommended Standard." It was introduced by the Electronic Industries Association (EIA) in the 1960s as a standard for serial communication protocols used in computer and peripheral connections. RS-232 defines the electrical characteristics and timing of signals, as well as the physical size and pinout of connectors.
Recommended Standard 232
An RS-232 connector is a standard interface used for serial communication between devices, primarily in computer and telecommunications equipment. Typically characterized by its 9-pin (DB-9) or 25-pin (DB-25) configuration, it transmits data one bit at a time over a single communication line. RS-232 is known for its simplicity and ease of use, though it has largely been replaced by more modern interfaces like USB in many applications. It operates at relatively low speeds and is designed for short-distance connections, typically up to 50 feet.
The "RS" in RS-232 stands for "Recommended Standard." RS-232 is a standard for serial communication that was introduced by the Electronic Industries Association (EIA) in the 1960s. It defines the electrical characteristics and timing of signals, as well as the physical size and pinout of connectors used for serial data exchange.
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The "RS" in RS-232 stands for "Recommended Standard." It was introduced by the Electronic Industries Association (EIA) in the 1960s as a standard for serial communication interfaces, primarily for connecting computers and peripherals. RS-232 defines the electrical characteristics and timing of signals, as well as the physical size and pinout of connectors used in serial communication.
The standard defines the voltage levels that represent logic levels on the line.It doesn't specify a connector. DB-9, 15, and 25 are among the popular ones,but RS-232 circuits can even be wired directly, through 3 or 4 leads, withouta connector, and without violating anything in the standard.Moreover, we should at all times remain mindful of the immortal words of the giantsupon whose shoulders we all stand:"The best thing about standards is that there are so many good ones to choose from."