RS-232(UART), RS-422, RS-432, RS-485 비교

 

SPECIFICATIONS		RS-232	RS-423	RS-422	RS-485
Mode of Operation		SINGLE -ENDED	SINGLE -ENDED	DIFFER- ENTIAL	DIFFER- ENTIAL
Total Number of Drivers and Receivers on One Line		1 DRIVER 1 RECVR	1 DRIVER 10 RECVR	1 DRIVER 10 RECVR	1 DRIVER 32 RECVR
Maximum Cable Length		50 FT.	4000 FT.	4000 FT.	4000 FT.
Maximum Data Rate		460kb/s	100kb/s	10Mb/s	30Mb/s
Maximum Driver Output Voltage		+/-25V	+/-6V	-0.25V to +6V	-7V to +12V
Driver Output Signal Level (Loaded Min.)	Loaded	+/-5V to +/-15V	+/-3.6V	+/-2.0V	+/-1.5V
Driver Output Signal Level (Unloaded Max)	Unloaded	+/-25V	+/-6V	+/-6V	+/-6V
Driver Load Impedance (Ohms)		3k to 7k	>=450	100	54
Max. Driver Current in High Z State	Power On	N/A	N/A	N/A	+/-100uA
Max. Driver Current in High Z State	Power Off	+/-6mA @ +/-2v	+/-100uA	+/-100uA	+/-100uA
Slew Rate (Max.)		30V/uS	Adjustable	N/A	N/A
Receiver Input Voltage Range		+/-15V	+/-12V	-10V to +10V	-7V to +12V
Receiver Input Sensitivity		+/-3V	+/-200mV	+/-200mV	+/-200mV
Receiver Input Resistance (Ohms)		3k to 7k	4k min.	4k min.	>=12k

 

Universal Asynchronous Receiver Transmitter (UART) 
UART Platform Specific Important Information

The platform integrates three Universal Asynchronous Receiver Transmitter (UART) 
controllers. Each supports up to 3.8 Mbit/s. The controllers can be used in the low-
speed, full-speed, and high-speed modes. The controllers are based on the 16550 
industry standard and communicates with serial data ports that conform to the RS-232 
interface protocol.

 

Trace spacing between DATA and DATA  50 ohm trace width & 1:1 spacing