Unable to get encoder output

[EEEngineer]

Hi,

I am using the planetary motor IG32E. I could not get the periodic square wave waveform from the encoder output directly. I saw on the datasheet (http://www.cytron.com.my/usr_attachment ... cation.pdf) that a 1kohm resistor is required in order to get the signal. However, I could not understand how this resistor is supposed to be connected to the circuit.

Can someone help me please?

[robosang]

............

This is what we call open drain output. You will need to pull-up to the logic you prefer. I really don know which part you do not understand. The datasheet have shown quite clear picture. Connect a resistor, you can try with 1K, but I normally use 10K, connect one end to the output (A or B) and the other end of resistor connect to let's say 5V. Of course GND is a must, just common it up.

You should get pulses out when motor start rotating. I think Cytron's staff did an article and video on quadrature encoder. Let me find it. Here you are: Quadrature Encoder.

The video:

[ober]

On top of what robosang explained, normally this type of output is also called open collector.



Most of encoder and sensor will use this output because it offer variety of logic interface. From 3.3V to 24V without problem, so microcontroller can use it, PLC can use it, Relay can use it....

The disadvantage, you will need to pull up with a resistor as shown in the above figure. The transistor can only sink (take) current, it cannot source (give) current, so if there is no resistor pulling it up to the voltage you want, you will never see any signal .

For more information, please refer to wiki: Open Collector

[EEEngineer]

Thank you all very much for the information. It is clear to me now. Cheers!