By Charles D. Spencer

This electronic electronics textual content makes a speciality of ''how to'' layout, construct, function and adapt facts acquisition platforms. the cloth starts off with uncomplicated common sense gates and ends with a forty KHz voltage measurer. The procedure goals to hide a minimum variety of themes intimately. the information acquisition circuits defined converse with a bunch computing device via parallel I/O ports. the elemental concept of the publication is that parallel I/O ports (available for all well known desktops) supply an excellent stability of simplicity, competitively priced, velocity, flexibility and suppleness. All circuits and software program are completely verified. building info and troubleshooting instructions are integrated. This publication is meant to serve those that train or research one of many following: electronic electronics, circuit layout, software program that interacts open air undefined, the method of computing device dependent acquisition, and the layout, model, building and checking out of size platforms.

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The output of a TTL gate connected to two inputs. When OUT is high no current flows; when OUT is low, current flows from the inputs to the output. 31 shows the output of a TTL gate connected to the inputs of two gates. When the output is +5 volts, little current flows either way between the output and inputs. However, when the output is 0 volts, current flows from a higher electric potential at the inputs to the zero potential at the output. Therefore, a low output must receive or sink current.

Row Q1 CLR* Q2 a 0 0 1 b 1 0 1 c 0 1 1 d 1 1 0 a single high input does not fix NAND outputs. However, the following sequence does. (1) Take SET* low. This puts NAND-1 on truth table row a or c and makes Ql definitely high (the flip-flop is set). With Ql and CLEAR* high, NAND-2 is on row d and Q2 is low. This puts NAND-1 on row a and Ql remains high. (2) Take SET* back high. This moves NAND-1 from row a to row b and keeps Ql high. NAND-2 stays on row d. (3) Take CLEAR* low. This moves NAND-2 from row d to b and Q2 from low to high.

DI0 are wired HLLHHLLL, execution of X = INP(DP) makes X = 152, the binary value of 10011000. 4. v a r i a b l e = INP (DP) results in variable equaling the 8-bit value presented to the data-in bits at the time of statement execution. 5 explains how software uses the 32 port connections to control and monitor external hardware and to input and output data. 4). In each case, the ports circuit is on a board which plugs into one of the host computer's expansion slots. The 32 bits and ground are made available to external data acquisition hardware through appropriate multiconductor cables (supplied by the manufacturer or as described in Appendices D and E).

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