[ PCB설계 ]/2.통신, 규격, DesignGuide
RS-232(UART), RS-422, RS-432, RS-485 비교
HUMINS
2022. 5. 28. 09:10
| 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