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Compare serial communication protocols RS-232C and RS-485.

Mumbai University > Electronics Engineering > Sem 6 > Embedded System and RTOS

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Comparison of RS232 and RS485:

Specifications RS232 RS485
Mode of Operation Single Ended Differential
Total Number of Drivers and Receivers on One Line (One driver active at a time for RS485 networks) 1 Driver 1 Receiver 32 Driver 32 Receiver
Maximum Cable Length 50 FT. 4000 FT.
Maximum Data Rate (40ft. - 4000ft. for RS422/RS485) 20kb/s 10Mb/s-100Kb/s
Maximum Driver Output Voltage +/-25V -7V to +12V
Driver Load Impedance (Ohms) 3k to 7k 54
Slew Rate (Max.) 30V/uS N/A
Receiver Input Voltage Range +/-15V -7V to +12V
Receiver Input Sensitivity +/-3V +/-200mV
Receiver Input Resistance (Ohms) 3k to 7k $\gt =12k$
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