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