ST485 is a RS-485 based interface designed for multipoint differential transmission on a single twisted pair cable. It allows half duplex bi-directional transmission, long cable length and high data rate. Typical applications include LANs, industrial (PLC devices), automotive and computer interfaces. The system evolution in the data communication field leads to the development of faster devices with lower data bit errors and ST485 meets all these requirements.
The ST485 is an RS-485 based interface designed for multipoint differential transmission on a single twisted pair cable. It supports half-duplex bi-directional transmission with long cable lengths and high data rates, making it suitable for LANs, industrial PLC devices, automotive, and computer interfaces. The document outlines the internal structure where driver and receiver line pins are connected for half-duplex operation, utilizing TTL inputs and differential outputs.
| Supply Voltage | 5V |
|---|---|
| DC Consumption | less than 0.5mA |
| Data Rate | greater than 10Mbps |
| Receiver Input Threshold | +200mV |
| Receiver Input Resistance | greater than 40kOhm |
| Common Mode Voltage Range | -7V to +12V |
| Driver Output Voltage | greater than 1.5V |
| Short-Circuit Current Limit | 70mA |
The typical DC consumption is less than 0.5mA without load.
The ST485 allows the connection of more than 32 units together.
The receiver input threshold is +200mV to ensure noise immunity.