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ADM3488ARZ датащи(PDF) 15 Page - Analog Devices |
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ADM3488ARZ датащи(HTML) 15 Page - Analog Devices |
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15 / 20 page ![]() ADM3483/ADM3485/ADM3488/ADM3490/ADM3491 Rev. B | Page 15 of 20 LINE LENGTH VS. DATA RATE The RS-485 and RS-422 standards cover line lengths up to 4000 feet. For line lengths greater than 4000 feet, see Figure 36. B A R D RO RE DI DE ADM3483/ ADM3485 ADM3483/ ADM3485 ADM3483/ ADM3485 ADM3483/ ADM3485 B A R D RO RE DI DE B A R D RO RE DI DE B A R D RO RE DI DE MAXIMUM NUMBER OF TRANSCEIVERS ON BUS = 32 RT RT NOTES 1. RT IS EQUAL TO THE CHARACTERISTIC IMPEDANCE OF THE CABLE. VCC R1 R2 Figure 32. ADM3483/ADM3485 Typical Half-Duplex RS-485 Network R D RO RE DI DE ADM3491 ADM3491 A B Z Y R D RO DI DE A B Z Y RE R D RO DI DE ADM3491 MASTER SLAVE SLAVE A B Z Y RE MAXIMUM NUMBER OF NODES = 32 ADM3491 R D RO DI DE A B Z Y RE SLAVE NOTES 1. RT IS EQUAL TO THE CHARACTERISTIC IMPEDANCE OF THE CABLE. RT RT RT VCC R1 R2 RT VCC R1 R2 Figure 33. ADM3491 Typical Full-Duplex RS-485 Network |
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