RS-422 interface
This interface is similar to RS485 interface. The RS422 interface is used for multi drop configuration and supports up to 10 devices at a time. It is used in balanced differential mode. It supports data rate from 100 kbps to about 10 Mbps.
Figure depicts RS 422 pin configuration for 9 pin connector.
RS422 Technical Specifications
Following table-1 describes RS422 technical specifications.
| Specifications | RS422 |
|---|---|
| Mode of operation | Differential |
| number of drivers/receivers on one line | 1 driver, 10 receiver |
| maximum cable length | 4000 feet |
| maximum data rate | 10 Mbps |
| max. driver output voltage | -0.25V to +6V |
| Max. driver current in high impedance state (power off) | +/-100 µA |
| receiver input voltage range | -10V to +10V |
| Receiver input sensitivity | +/-200mV |
| Driver load impedance | 100 Ohms |
| Receiver Input Resistance | 4K min. |
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