I am using SN65HVS883 to detect the digital input signal for industrial . I had seen the datasheet and found that it has ESD protection and require a MELF resistor and capacitor. Normally, My input signal is 10 to 30 V and field supply voltage is 12V. My question are following:
1. Do I need more external protection for input such as overvoltage, surge protection?
2. Can I apply the input voltage more than field supply voltage?
3. If I don't want to place the LED at REx pin. How can I do to this pin?