Datasheet

ADM1486
Rev. A | Page 14 of 16
Table 7. Comparison of RS-422, RS-485, and PROFIBUS Interface Standards
Specification RS-422 RS-485 PROFIBUS
Transmission Type Differential Differential Differential
Maximum Cable Length 4,000 ft. 4,000 ft.
Minimum Driver Output Voltage ±2 V ±1.5 V ±2.1 V
Driver Load Impedance 100 Ω 54 Ω 54 Ω
Receiver Input Resistance 4 kΩ min 12 kΩ min 20 kΩ min
Receiver Input Sensitivity ±200 mV ±200 mV ±200 mV
Receiver Input Voltage Range −7 V to +7 V −7 V to +12 V −7 V to +12 V
No. of Drivers/Receivers per Line 1/10 32/32 50/50