The other major difference is the output voltage between the two. The Totem Pole output is going to sink/source less current then a Push Pull output is capable of sinking or sourcing.
The major difference between it and a Push Pull is the amount of current that it can sink or source. A Push Pull output is chosen when an Open Collector output will not work with the controller that is connected to the encoderĪ Totem Pole output is essentially the same as a Push Pull output however, it is the terminology commonly used when referring to a TTL device. This type of an output allows you to sink more current than a Totem Pole output and follow the input voltage. It can also help in increasing the distance in which a signal is transmitted.Ī Push Pull output is an output that allows you to connect either a sinking or sourcing circuit. A differential line driver will work both with a sinking or sourcing circuit. A differential line driver also allows you to sink or source more current then a Totem Pole output.
A differential line driver is used to help increase noise immunity. Controllers can compare each pair (“A” must be equal to inverted “/A”) to ensure that there is no error during the transmission.Īdditionally the transmission sensitivity is improved by transmitting the differential signals through a twisted pair cable.A differential output refers to the fact that each channel has a complement channel, i.e.
These signals are inverted “A”, “B” and “Z” signals. Some incremental encoders also have additional differential signals, called “/A”, “/B” and “/Z”. This can be used as an accurate reference point. Once every rotation, this Z signal is rising for typically 90°, on the exact same position. By turning the encoder clockwise, the “A” pulse is rising 90° ahead of the “B” pulse, by turning the shaft counterclockwise, the “B” pulse is rising ahead of the “A” pulse.Īdditionally some incremental encoders output a “Z” signal. These 2 signals are set up with a 90° offset, which is required for the detection of the encoder’s rotation. One sensor must be connected to one controller.Īn incremental encoder has at least 1 output signal “A” or typically 2 output signals, called “A” and “B”. Incremental rotary encoders provide a serial output signal on a single transmission line.
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