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The USC-2 is designed to handle two 90° shifted encoder signals delivered by standard commercial encoders. The USC-2 decoder interprets each transition, whether it is on MOTF_CH_A or Channel  MOTF_CH_B, as a count impulse. The up/down information (which reflects the moving direction of the belt) is taken from the order of transitions and the state for both channels. If  for example MOTF_CH_A is high while MOTF_CH_B goes from low to high the direction is up. If MOTF_CH_A is low while MOTF_CH_B goes from low to high the direction is down. Similar rules are valid for other combinations of channel state and transitions.

Therefore exchanging the MOTF_CH_A with MOTF_CH_B wiring from the encoder to the USC-2 or inserting inverting elements will not effect the count pulses but will effect the up/down information encoding.

Figure 25: Encoder signals