RS232 vs RS485 vs RS422

Table of Contents

RS232 vs RS485 vs RS422 :

Sr No. Parameter RS -232 RS – 422 RS -485
1 Wiring for communication Single-ended Differential Differential
2 Signal type Unbalanced Balanced Balanced
3 Output voltage
Logic 0 + 5 to + 15 V w.r.t GND + 2 to – 6 V on terminal A w.r.t B + 2 to + 6 V on terminal A wr.t B
Logic 1 -5 to -15 v w.r.t GND – 2 to – 6 V on terminal A w.r.t B – 2 to – 6 V on terminal A wr.t B
4 Data rate 20 kbps (max) 100 Mbps at 15 m 100 kpbs at 1200 m 100 Mbps at 15 m 100 kpbs at 1200 m
5 Maximum cable length 15 m 1.2 km 10 km
6 Maximum drivers 1 1 32
7 Maximum receivers 1 7 32
8 Source impedance 300 Ω 100 Ω 100 Ω
9 Load impedance 3 to 7 kΩ 4 kΩ
10 Direction Uni-direction Uni-direction Bi-direction
11 Communication type Full-duplex Half-duplex – 2-wire full-duplex -4-wire Half-duplex
12 Point-to-point/master-slave Point-to-point Master-slave Master-slave

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