Table ข้างล่างนี้เป็นการสรุปคุณสมบัติของมาตรฐานต่าง ๆ ที่นิยมใช้กันทั่วไป
|
Specification
|
RS-232
|
RS-423
|
RS-422
|
RS-485
|
|
| Mode of operation |
Single-ended
|
Single-ended
|
Differential
|
Differential
|
|
| Total number of drivers and receivers on one line |
1Tx
1Rx
|
1Tx
10Rx
|
1Tx
10Rx
|
1Tx
32Rx
|
|
| Maximum cable length |
50Ft
|
4,000Ft
|
4,000Ft
|
4,000Ft
|
|
| Maximum data rate |
20Kbps
|
100Kbps
|
10Mbps
|
10Mbps
|
|
| 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
|
+/-2V
|
+/-1.5V
|
| Driver output signal level (loaded 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
| |
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