taken to be the function that associates any given world with the predicate's particular extension in that world. Then a grammar can show how those sub- sentential intensions combine to make a truth condition, hence a meaning, for a complete sentence of which they are components. The resulting view neatly avoids several of the objections that beset Davidson's theory, most notably 4, the problem of coextending but nonsynonymous terms, and 5, the problem of non-truth-functional connec- tives. It also lends a hand with the Problem of Substitutivity. But it inherits the rest of Davidson's difficulties and incurs one or two more. Truth conditions reconceived As we saw in the previous chapter, the Truth-Condition Theory understands meaning as representation, as mirroring or correspondence between sen- tences and actual or possible states of affairs. But we can take the notion of a hypothetical state of affairs more seriously than Davidson is willing to, and
70 Wiring and Connections Section 3-4 The following diagram shows the wiring in the RS-422 cables used to connect CPM1A PCs to a 3G2A9-AL004-E Link Adapter. In both the Link Adapter/ RS-422 Adapter connections and the RS-422 Adapter/RS-422 Adapter connec- tions, connect the SG, RDA, RDB, SDA, and SDB terminals to the same termi- nals in the other Adapter. 3G2A9-AL004-E Link Adapter 9-pin D-sub Connector Signal Pin no. RDB 1 – 2
The moving rotor will gener- ate a voltage in the coil that is not driven. This voltage will cross zero once during the OFF period, and can be sensed to indicate the rotor position. Note that the voltage being measured is the voltage across the unused coil; in other Figure 7.25 Brushless DC motor drive. 186 Analog Interfacing to Embedded Microprocessors words, the difference between the coil connection and the common connec- tion point for all the coils. Figure 7.26 shows a sensorless drive configuration for a brushless DC motor. This circuit brings the common connection point of the three motor coils back to the ADC circuitry as a reference; this is not always necessary. However, this technique can reduce the noise in the measurement. If the common point cannot be used as a reference, it could be connected to a fourth ADC channel and the value subtracted from the sensed coil in soft- ware
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