Rs232 protocol

Spring naar Step 2: Learn about the Protocol – A protocol is one or a few sets of hardware and software rules agreed to by all communication parties for exchanging data correctly and efficiently. De oorspronkelijke standaard beschreef de communicatie tussen een modem en een computerterminal. The character format and transmission bit rate are set by the serial port hardware which may also contain circuits to convert the internal logic levels to RS-2compatible signal levels. The standard does not define bit rates for transmission, except that it says it is . As it obtains the voltage for the path used for the data exchange between the devices.

RS-2is a standard communication protocol for linking computer and its peripheral devices to allow serial data exchange. It specifies common voltage and signal level, common pin wire configuration and minimum,. Het woord serieel betekent dat de informatie bit voor bit wordt verzonden. Asynchroon leert ons, dat de informatie niet op vooraf afgesproken momenten wordt verzonden. Het verzenden van data kan op elk . Here, DTE stands for Data Terminal Equipment and an example for DTE is a computer.

DCE stands for Data Communication Equipment or Data Circuit Terminating Equipment and an example for DCE is a modem. The poll is AMX in ASCII followed by a carriage return ‘r’. It is called asynchronous because there is no separate synchronizing clock signal as there are in other serial protocols like SPI and I2C.

RS2was introduced in . The protocol is such that it automatically synchronize itself. This video demonstrates how to use RealTerm (on PC) and CoolTerm (on Mac) for serial communication using. Rs2protocol transmission involves the sending of data one bit at a time, over a single communications line. In contrast, parallel communications require at least as many lines as there are bits in a word being transmitted (for an 8-bit wor a minimum of lines are needed). Serial Interface Specification.

Data frame format: Stx: frame start flag, always=02H. Item code: data name, valid range 20H~FFH HEX. Bit Data: valid data ASCII. Suitable for laptops and desktop computer, server racks or industrial environments. Up to Mega bit baud rates.

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