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1 All active listeners use the not ready for data (NRFD) line to indicate their state of readiness to accept a new piece of information Nonreadiness to accept data is indicated if the NRFD line is held at zero volts If even one active listener is not ready, the NRFD line of the entire bus is kept at zero volts and the active talker will not transmit the next byte When all active listeners are ready and they have released the NRFD line, it now goes high 2 The designated talker drives all eight data input/output lines, causing valid data to be placed on them 3 Two microseconds after putting valid data on the data lines, the active talker pulls the data valid (DAV) line to zero volts and thereby signals the active listeners to read the information on the data bus The 2- s interval is required to allow the data put on the data lines to reach (settle to) valid logic levels 4 After the DAV is asserted, the listeners respond by pulling the NRFD line back down to zero This prevents any additional data transfers from being initiated The listeners also begin accepting the data byte at their own rates 5 When each listener has accepted the data, it releases the not data accepted (NDAC) line Only when the last active listener has released its hold on the NDAC line will that line go to its high-voltage-level state 6 (a) When the active talker sees that NDAC has come up to its high state, it stops driving the data line (b) At the same time, the talker releases the DAV line, ending the data transfer The talker may now put the next byte on the data bus 7 The listeners pull down the NDAC line back to zero volts and put the byte away Each of the instruments present on the data bus is distinguished by its own address, which is known to the controller; thus, the controller determines who the active talkers and listeners are on the bus by addressing them To implement this and other functions, the controller uses the ve control lines Of these, ATN (attention) is used as a switch to indicate whether the controller is addressing or instructing the devices on the bus, or whether data transmission is taking place: when ATN is logic 1, the data lines contain either control information or addresses; with ATN = 1, only the controller is enabled to talk When ATN = 0, only the devices that have been addressed can use the data lines The IFC (interface clear) line is used to initialize the bus, or to clear it and reset it to a known condition in case of incorrect transmission The REN (remote enable) line enables a remote instrument to be controlled by the bus; thus, any function that might normally be performed manually on the instrument (eg, selecting a range or mode of operation) is now controlled by the bus via the data lines The SRQ (service request) line is used by instruments on the bus whenever the instrument is ready to send or receive data; however, it is the controller who decides when to service the request Finally, the EOI (end or identify) line can be used in two modes: when it is used by a talker, it signi es the end of a message; when it is used by the controller, it serves as a polling line, that is, a line used to interrogate the instrument about its data output Although it was mentioned earlier that the IEEE 488 bus can be used only over distances of up to 20 m, it is possible to extend its range of operation by connecting remote IEEE 488 bus systems over telephone communication lines This can be accomplished by means of bus extenders, or by converting the parallel data to serial form (typically, in RS-232 format) and by transmitting the serial.

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data over the phone lines by means of a modem Serial communications and the RS-232 standard are discussed in the next section The RS-232 Standard The primary reason why parallel transmission of data is not used exclusively is the limited distance range over which it is possible to transmit data on a parallel bus Although there are techniques which permit extending the range for parallel transmission, these are complex and costly Therefore, serial transmission is frequently used, whenever data is to be transmitted over a signi cant distance Since serial data travels along one single path and is transmitted one bit at a time, the cabling costs for long distances are relatively low; further, the transmitting and receiving units are also limited to processing just one signal, and are also much simpler and less expensive Two modes of operation exist for serial transmission: simplex, which corresponds to transmission in one direction only; and duplex, which permits transmission in either direction Simplex transmission requires only one receiver and one transmitter, at each end of the link; on the other hand, duplex transmission can occur in one of two manners: half-duplex and full-duplex In the former, although transmission can take place in both directions, it cannot occur simultaneously in both directions; in the latter case, both ends can simultaneously transmit and receive Full-duplex transmission is usually implemented by means of four wires The data rate of a serial transmission line is measured in bits per second, since the data is transmitted one bit at a time The unit of 1 bit/s is called a baud; thus, reference is often made to the baud rate of a serial transmission The baud rate can be translated into a parallel transmission rate in words per second if the structure of the word is known; for example, if a word consists of 10 bits (start and stop bits plus an 8-bit data word) and the transmission takes place at 1,200 baud, 120 words are being transmitted every second Typical data rates for serial transmission are standardized; the most common rates (familiar to the users of personal computer modem connections) are 300, 600, 1,200, and 2,400 baud Baud rates can be as low as 50 baud or as high as 19,200 baud Like parallel transmission, serial transmission can also occur either synchronously or asynchronously In the serial case, it is also true that asynchronous transmission is less costly but not as fast A handshake protocol is also required for asynchronous serial transmission, as explained in the following The most popular data-coding scheme for serial transmission is, once again, the ASCII code, consisting of a 7-bit word plus a parity bit, for a total of 8 bits per character The role of the parity bit is to permit error detection in the event of erroneous reception (or transmission) of a bit To see this, let us discuss the sequence of handshake events for asynchronous serial transmission and the use of parity bits to correct for errors In serial asynchronous systems, handshaking is performed by using start and stop bits at the beginning and end of each character that is transmitted The beginning of the transmission of a serial asynchronous word is announced by the start bit, which is always a 0 state bit For the next ve to eight successive bit times (depending on the code and the number of bits that specify the word length in that code), the line is switched to the 1 and 0 states required to represent the character being sent Following the last bit of the data and the parity bit (which will be explained next), there is one bit or more in the 1 state, indicating idle The time period associated with this transmission is called the stop bit interval.

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