These characteristics include: definition of a unit load, voltage ranges, open-circuit voltages, thresholds, and transient tolerance.

However this contradicts the facts that an idle mark state is a logical one and the termination polarization puts B at a higher voltage in Profibus guidelines. Without termination resistors, signal reflections off the unterminated end of the rs485 cable ([written by ttlink.com](http://ttlink.com/capdiensaigon "written by ttlink.com")) can cause data corruption.