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Characteristics of RS232, RS422, RS423 and TIA(RS)-485 Banner.jpg.jpg

Characteristics of RS232, RS422, RS423 and TIA(RS)-485

RS232 RS423 RS422 TIA(RS)-485
Differential no no yes yes
Max number of drivers 1 1 1 32
Max number of receivers 1 10 10 32
Modes of operation half duplex full duplex half duplex half duplex half duplex
Network topology point to point multidrop multidrop multipoint
Max distance (acc. standard) 15 m 1200 m 1200 m 1200 m
Max speed at 12m 20 kbs 100 kbs 10 mbs 35 mbs
Max speed at 1200 m (1 kbs) 1 kbs 100 kbs 100 kbs
Max slew rate 30 V/µs adjustable n/a n/a
Receiver input resistance 3..7 kΩ ≥ 4 kΩ ≥ 4 kΩ ≥ 12 kΩ
Driver load impedance 3..7 kΩ ≥ 450 kΩ 100 Ω 54 Ω
Receiver input sensitivity ± 3 V ± 200 mV ± 200 mV ± 200 mV
Receiver input range ± 15 V ± 12 V ± 10 V -7..12 V
Max driver output voltage ± 25 V ± 6 V ± 6 V -7..12 V
Min driver output voltage (with load) ± 5 V ± 3.6 V ± 2.0 V ± 1.5 V
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