barcode reader in asp.net codeproject Electronic Instrumentation and Measurements in Software

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If noise pulses affect the transmission line, it is possible that a bit in the transmission could be misread Thus, following the 5 to 8 transmitted data bits, there is a parity bit that is used for error detection Here is how the parity bit works If the transmitter keeps track of the number of 1s in the word being sent, it can send a parity bit, a 1 or a 0, to ensure that the total number of 1s sent is always even (even parity) or odd (odd parity) Similarly, the receiver can keep track of the 1s received to see whether there was an error with the transmission If an error is detected, retransmission of the word can be requested Serial data transmission occurs most frequently according to the RS-232 standard The RS-232 standard is based on the transmission of voltage pulses at a preselected baud rate; the voltage pulses are in the range 3 to 15 V for a logic 0 and in the range +3 to +15 V for a logic 1 It is important to note that this amounts to a negative logic convention and that the signals are not TTL-compatible The distance over which such transmission can take place is up to approximately 17 m (50 ft) The RS-232 standard was designed to make the transmission of digital data compatible with existing telephone lines; since phone lines were originally designed to carry analog voice signals, it became necessary to establish some standard procedures to make digital transmission possible over them The resulting standard describes the mechanical and electrical characteristics of the interface between data terminal equipment (DTE) and data communication equipment (DCE) DTE consists of computers, terminals, digital instruments, and related peripherals; DCE includes all of those devices that are used to encode digital data in a format that permits their transmission over telephone lines Thus, the standard speci es how data should be presented by the DTE to the DCE so that digital data can be transmitted over voice lines A typical example of DCE is the modem A modem converts digital data to audio signals that are suitable for transmission over a telephone line and is also capable of performing the reverse function, by converting the audio signals back to digital form The term modem stands for modulate-demodulate, because a modem modulates a sinusoidal carrier using digital pulses (for transmission) and demodulates the modulated sinusoidal signal to recover the digital pulses (at reception) Three methods are commonly used for converting digital pulses to an audio signal: amplitude-shift keying, frequency-shift keying, and phase-shift keying, depending on whether the amplitude, phase, or frequency of the sinusoid is modulated by the digital pulses Figure 1570 depicts the essential block of a data transmission system based on the RS-232 standard, as well as examples of digital data encoded for transmission over a voice line In addition to the function just described, however, the RS-232 standard also provides a very useful set of speci cations for the direct transmission of digital data between computers and instruments In other words, communication between digital terminal instruments may occur directly in digital form (ie, without digital communication devices encoding the digital data in a form compatible with analog voice lines) Thus, this standard is also frequently used for direct digital communication The RS-232 standard can be summarized as follows:
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Data signals are encoded according to a negative logic convention using voltage levels of 3 to 15 V for logic 1 and +3 to +15 V for logic 0 Control signals use a positive logic convention (opposite to that of data signals)
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