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The standard specifies a maximum open-circuit voltage of 25 volts: signal levels of ±5 V, ±10 V, ±12 V, and ±15 V are all commonly seen depending on the voltages available to the line driver circuit. Many RS-232 driver chips have inbuilt charge pump circuitry to produce the required voltages from a 3 or 5 volt supply. RS-232 drivers and ...
After the RS-232 COM port was removed from most consumer-grade computers, an external USB-to-UART serial adapter cable was used to compensate for the loss. A major supplier of these chips is FTDI . [ citation needed ]
MAX232 chip in DIP-16 package The die of a MAX232 MAX232 pinout: Red: power, Yellow: charge pump capacitors, Blue: outputs, Green: inputs, Pins 9–12: TTL/CMOS I/O voltages. The MAX232 is an integrated circuit by Maxim Integrated Products, now a subsidiary of Analog Devices, that converts signals from a TIA-232 (RS-232) serial port to signals suitable for use in TTL-compatible digital logic ...
Third-party applications can add this ability, such as the open-source com0com, freeware HW VSP3, or the commercial Virtual Serial Port Driver. Some virtual serial ports emulate all hardware serial port functionality, including all signal pin states, and permit a large number of virtual ports in any desired configuration.
FTDI US232R : USB to RS-232 cable. A USB-to-serial adapter or simply USB adapter is a type of protocol converter that is used for converting USB data signals to and from serial communications standards (serial ports). Most commonly the USB data signals are converted to either RS-232, RS-485, RS-422, or TTL-level UART serial data.
FTDI TTL-232RG: USB to UART cable FTDI FT232RL: USB to UART IC (in SSOP package) Internal die of FTDI FT232RL chip FTDI was founded on 13 March 1992 [3] by its current CEO, Fred Dart (whose initials happen to be "FTD").
For basic RS-232-style communications, the SCC included an internal 300 Hz clock that could be multiplied by 1, 16, 32 to 64, providing data rates between 300 and 19,200 bit/s. Alternately, it could use the clock on the bus as provided by the host platform, and then divide that clock by 4, 8, 16 or 32 (the later two only in the original NMOS ...
Common Hybrid Interface Protocol System (CHIPS) is the definition of a computer network that consists of a mixture of common serial data protocols such as RS-232 and RS-485, or can be even PC keyboard interface communication.
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