Line Drivers and receivers are usually used when there is a data exchange between 2 or more devices in a network. What is the difference between each transmission protocols (RS485, RS422, RS423 and RS232) in data communication?
Below comparsion table between RS485, RS422, RS423 and RS232 can help.
| Specification | RS485 | RS422 | RS423 | RS232 |
|---|---|---|---|---|
| Line Configuration | Differential | Differential | Single-ended | Single-ended |
| Total number of Tx and Rx on one line | 32Tx 32Rx | 1Tx 10Rx | 1Tx 10Rx | 1Tx 1Rx |
| Maximum Cable Distance (at 1000kbps) | ~4000 feet | ~4000 feet | ~4000 feet | ~50 feet |
| Maximum Data Rate (for 50 feet) | 10Mbps | 10Mbps | 100kbps | 20kbps |
| Typical logic levels | ±1.5V~±6V | ±2V~±6V | ±3.6V~±6V | ±5V~±25V |
| Tx load impedance | 54Ω | 100Ω | >=450Ω | 3k - 7kΩ |
| Maximum Rx input resistance | 12kΩ | 4kΩ | 4kΩ | 3~7kΩ |
| Receiver input sensitivity | ± 200mV | ± 200mV | ± 200mV | ± 3V |