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No.172 What are differences among the RS232, RS422 and RS485? 23-05-2007
Category : basic

RS232,422 and 485 are standards of serial communication.
It is not a standards of communication method, but electronical signal.
Therefore they use the same protocol.

-Here is a quick reference for RS232, RS422, RS485


Division RS232 RS422 RS485
Mode of Operation Single-Ended Differential Differential
The Number of Drivers/Receivers on one line 1 Driver,
1 Receiver
1 Driver,
10 Receivers
32 Drivers,
32 Receivers
The Maximum Cable Length 50 ft 4000 ft 4000 ft
Maximum Data Rate 20 kbps 10 Mbps 10 Mbps
Full/Half Duplex Full Duplex Full Duplex Half Duplex
Maximum Driver Output Signal Level ±25V -0.25V to +6V -7V to +12V
Receiver Input Voltage Range ±15V ±10V -7V to +12V




See also


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