The baud rate is the rate at which information is transferred in a communication channel. In the serial port context, "9600 baud" means that the serial port is capable of transferring a maximum of 9600 bits per second. If the information unit is one baud (one bit), then the bit rate and the baud rate are identical. If one baud is given as 10 bits, (for example, eight data bits plus two framing bits), the bit rate is still 9600 but the baud rate is 9600/10, or 960. You always configure BaudRate as bits per second. Therefore, in the above example, set BaudRate to 9600.
Standard baud rates include 110, 300, 600, 1200, 2400, 4800, 9600, 14400, 19200, 38400, 57600, 115200, 128000 and 256000 bits per second. To display the supported baud rates for the serial ports on your platform, refer to Finding Serial Port Information for Your Platform.
Standard Baud Rates For Serial Ports
The following table shows the most used baud rates. The left side part of thetable shows speed and bit duration. The right part shows real transmissionspeed assuming there is no parity, 8 data bits and one stop bit.To calculate real transmission speed with another serial configuration, you can check these online baud rate calculators:
In computing, a serial port is a serial communication interface through which information transfers in or out sequentially one bit at a time.[1] This is in contrast to a parallel port, which communicates multiple bits simultaneously in parallel. Throughout most of the history of personal computers, data has been transferred through serial ports to devices such as modems, terminals, various peripherals, and directly between computers.
While interfaces such as Ethernet, FireWire, and USB also send data as a serial stream, the term serial port usually denotes hardware compliant with RS-232 or a related standard, such as RS-485 or RS-422.
Modern consumer personal computers (PCs) have largely replaced serial ports with higher-speed standards, primarily USB. However, serial ports are still frequently used in applications demanding simple, low-speed interfaces, such as industrial automation systems, scientific instruments, point of sale systems and some industrial and consumer products.
Server computers may use a serial port as a control console for diagnostics, while networking hardware (such as routers and switches) commonly use serial console ports for configuration, diagnostics, and emergency maintenance access. To interface with these and other devices, USB-to-serial converters can quickly and easily add a serial port to a modern PC.
Modern devices use an integrated circuit called a UART to implement a serial port. This IC converts characters to and from asynchronous serial form, implementing the timing and framing of data specified by the serial protocol in hardware. The IBM PC implements its serial ports, when present, with one or more UARTs.
Very low-cost systems, such as some early home computers, would instead use the CPU to send the data through an output pin, using the bit banging technique. These early home computers often had proprietary serial ports with pinouts and voltage levels incompatible with RS-232.
Before large-scale integration (LSI) made UARTs common, serial ports were commonly used in mainframes and minicomputers, which would have multiple small-scale integrated circuits to implement shift registers, logic gates, counters, and all the other logic needed. As PCs evolved serial ports were included in the Super I/O chip and then in the chipset.
The 9-pin DE-9 connector has been used by most IBM-compatible PCs since the Serial/Parallel Adapter option for the PC-AT, where the 9-pin connector allowed a serial and parallel port to fit on the same card.[4] This connector has been standardized for RS-232 as TIA-574.
Many models of Macintosh favor the related RS-422 standard, mostly using circular mini-DIN connectors. The Macintosh included a standard set of two ports for connection to a printer and a modem, but some PowerBook laptops had only one combined port to save space.[8]
Unix-like operating systems usually label the serial port devices .mw-parser-output .monospacedfont-family:monospace,monospace/dev/tty*. TTY is a common trademark-free abbreviation for teletype, a device commonly attached to early computers' serial ports, and * represents a string identifying the specific port; the syntax of that string depends on the operating system and the device. On Linux, 8250/16550 UART hardware serial ports are named /dev/ttyS*, USB adapters appear as /dev/ttyUSB* and various types of virtual serial ports do not necessarily have names starting with tty.
This list includes some of the more common devices that are connected to the serial port on a PC. Some of these such as modems and serial mice are falling into disuse while others are readily available. Serial ports are very common on most types of microcontroller, where they can be used to communicate with a PC or other serial devices.
Serial ports use two-level (binary) signaling, so the data rate in bits per second is equal to the symbol rate in baud. The total speed includes bits for framing (stop bits, parity, etc.) and so the effective data rate is lower than the bit transmission rate. For example, with 8-N-1 character framing, only 80% of the bits are available for data; for every eight bits of data, two more framing bits are sent.
A standard series of rates is based on multiples of the rates for electromechanical teleprinters; some serial ports allow many arbitrary rates to be selected, but the speeds on both sides of the connection must match for data to be received correctly. Bit rates commonly supported include 75, 110, 300, 1200, 2400, 4800, 9600, 19200, 38400, 57600 and 115200 bit/s.[13] Many of these standard modem baud rates are multiples of either 0.9 kbps (e.g., 19200, 38400, 76800) or 1.2 kbps (e.g., 57600, 115200).[17] Crystal oscillators with a frequency of 1.843200 MHz are sold specifically for this purpose. This is 16 times the fastest bit rate, and the serial port circuit can easily divide this down to lower frequencies as required.
The capability to set a bit rate does not imply that a working connection will result. Not all bit rates are possible with all serial ports. Some special-purpose protocols such as MIDI for musical instrument control, use serial data rates other than the teleprinter standards. Some serial port implementations can automatically choose a bit rate by observing what a connected device is sending and synchronizing to it.
The SoftwareSerial library allows serial communication on other digital pins of an Arduino board, using software to replicate the functionality (hence the name "SoftwareSerial"). It is possible to have multiple software serial ports with speeds up to 115200 bps. A parameter enables inverted signaling for devices which require that protocol.
Airconsole L 2.0 is our latest low cost Serial over Wifi and/or Bluetooth Low Energy adaptor for seamless use with Get Console iPhone and iPad terminal applications, as well as for use with PC, Mac and Android. This compact battery powered adaptor lets you work with RS232 serial ports without the physical cable going into your iPad/iPhone/Mac/PC/Android Device
Airconsole allows for easy wireless access to wired RS232 serial ports via a transparent standards based serial-over-wifi protocol. Full RS232 connectivity is supported including baud rates to 9.6k - 230k, 7/8 Data Bits, Odd/Even/No Parity, 1/2 stop bits, CTS/RTS and DSR/DTR hardware flow control. When used with Get Console, or via our supplied drivers it appears as a directly connected serial port to the terminal application.
Airconsole also allows for access to wired RS232 serial ports via Bluetooth Low Energy or Bluetooth 2.1 EDR (depending on client device). BLE Serial connectivity is supported on iOS and OSX platforms at baud rates from 1200 to 57600. Serial over Bluetooth 2.1EDR is supported on Windows and Android (using our free SerialBot app) at baud rates upto 115200. All standard RS232 settings such as 7/8 Data Bits, Odd/Even/No Parity, 1/2 stop bits, CTS/RTS and DSR/DTR hardware flow control are supported.
Airconsole is designed to work seamlessly with our iOS or Android applications (Get Console, RapidSSH or SerialBot). Just enable bluetooth, or for higher speeds simply join the Airconsole WIFI network and launch the app - the serial connections will use the Airconsole as if using a cable - Baud rates, flow control, and other serial settings are transparently applied to the adaptors serial port immediately on connection.
Full flow control, baud rates upto 115200, all pins connected and controllable via the Get Console application. Airconsole puts out true RS232 (+/-5v) voltage levels. The supplied RJ45 cable can easily be adapted to DB9, DB25 or DEX presentation via dongles available here in this webshop.
Airconsole has built in support for sharing its serial port with remote web users via the cloud. Using our low cost Get Console Private Server (licenses included in Pro/XL kits), Aggregate many remote serial devices into an always-on cloud based serial terminal server - a single web interface can provide remote console access to any and all manner of industrial, networking, home automation equipment via their RS232 management ports.
Serial Baud rates (using BLE) from 1200 through 57600. While 57600 baud is supported on serial side, the BLE radio limits actual throughput to 17Kbps (iOS) and packet buffering or possibly overflow may occur during sustained transfers over BLE. If sustained rates at 38400 or higher baud is required, switch to WIFI.
The baud rate is the rate at which information is transferredin a communication channel. In the serial port context, "9600 baud"means that the serial port is capable of transferring a maximum of9600 bits per second. If the information unit is one baud (one bit),then the bit rate and the baud rate are identical. If one baud isgiven as 10 bits, (for example, eight data bits plus two framing bits),the bit rate is still 9600 but the baud rate is 9600/10, or 960. Youalways configure BaudRate as bits per second.Therefore, in the above example, set BaudRate to9600. 2ff7e9595c
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