Why ATV68F type's encoder output must be 5V ? Customer tols us most others'(competitors') encoder output are 12V, because it would not disturb by exte...

Goals and Symptoms

Why ATV68F type's encoder output must be 5V ? Customer tols us most others'(competitors') encoder output are 12V, because it would not disturb by external interference. The 5V output is very easily disturbed by environmental problem such as EMC etc. How is the advantage to use an encoder with 5V output?

Causes and Fixes

The encoder input is RS422 and it work in 5v, this technology was choose for the cable lenght ( 120 m )