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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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DS78LS120W/883 датащи(PDF) 6 Page - National Semiconductor (TI) |
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DS78LS120W/883 датащи(HTML) 6 Page - National Semiconductor (TI) |
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6 / 9 page  Application Hints (Continued) 00749912 Balanced RS-422 Fail-Safe 00749913 00749914 For balanced operation with inputs open or shorted, receiver C will be in an indeterminate logic state. Receivers A and B will be in a logic zero state allowing the NOR gate to detect the open or short condition. The strobe will disable receivers A and B and may therefore be used to sample the fail-safe detector. Another method of fail-safe detection consists of filtering the output of NOR gate D so it would not indicate a fault condition when receiver inputs pass through the thresh- old region, generating an output transient. In a communications system, only the control signals are required to detect input fault conditions. Advantages of a balanced data transmission system over an unbalanced transmission system are: 1. High noise immunity 2. High data ratio 3. Long line lengths www.national.com 6 |
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