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sensitivity V ± 0.2 ± 0.2 Driver load, minimum Q 100 60 Maximum number of drivers 1 32 unit loads Maximum number of receivers 10 32 unit loads RECEIVER MEASURES VIN TO GND VA - VB Figure 6-1: An unbalanced line uses one wire per signal while a balanced line uses two wires per signal. Both types of line must have a common ground reference. 81 Chapter 6 present more or less equally on both wires, and any noise voltage that shows up on one line is canceled by an identical voltage on the other. The source of noise can be signals on other wires in the cable or signals that couple into the wires from outside the cable. A balanced receiver sees only the transmitted signal with noise eliminated or very much reduced. In contrast, in an unbalanced interface, the receiver detects the voltage difference between the signal wire and ground. When multiple signals share a ground wire, each of the return currents induces voltages on the ground shared by all. Parallel interfaces can have eight or more lines switching constantly, and even serial interfaces often have two data lines and multiple status and control signals. If the ground connects to an earth ground, noise from other sources can affect the circuits as well. Another advantage to balanced lines is that they are immune, within limits, to differences in ground potential between the driver and receiver. In a long cable, the grounds at the driver and receiver may vary by many volts. On an unbalanced line, ground differences can cause a receiver to misread an input. A balanced line can ignore mismatched grounds up to a limit because the receiver is detecting the difference between the two transmitted signals. In reality, RS-485 components are guaranteed to withstand ground differences only up to the limit specified in their data sheets. A way to eliminate or reduce ground-voltage problems is to isolate the line so the driver’s and receiver’s ground potentials have no effect on the line. Chapter 7 shows ways to ensure that prom-electric.ru