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USC-1 Manual > Marking On The Fly > Encoder Signals

Encoder Signals
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The USC-1 is designed to handle two 90° shifted encoder signals delivered by standard commercial encoders. The USC-1 decoder interprets each transition, whether it is on MOTF_CH_0_A or Channel  MOTF_CH_0_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_0_A is high while MOTF_CH_0_B goes from low to high the direction is up. If MOTF_CH_0_A is low while MOTF_CH_0_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_0_A with MOTF_CH_0_B wiring from the encoder to the USC-1 or inserting inverting elements will not effect the count pulses but will effect the up/down information encoding. The MarkingOnTheFly input is a non-differential input. The signal level must be between +4V and +5V in respect to ground (GND).

MOF_encoder

Figure 30: Encoder signals