*Refreshing this page at any point will restart the troubleshooting guide.
First, please reference the product manual for the encoder in question. Each encoder has unique power requirements, output types, and the number of pulses per revolution; and will be referenced throughout the troubleshooting process.
Verify that the unit is being powered
Red Lion encoders require DC power, refer to the encoder's product manual for its power requirements.
Is the encoder powered properly? 
Correct the power wiring.
Did correcting the power resolve the issue?
Verify the mag/logic dip switch is in the correct position for your encoder.
- Red Lion encoders output a DC square wave, which is a Logic input.
Did selecting the proper input type resolve the problem?
Verify the sink/source dip switch is in the correct position for your encoder.
-Sink if the encoder is creating a path to common.
-Source if the encoder is providing voltage to the input.
-Most encoders HMS sells are NPN or sinking outputs
Did selecting the proper input type resolve the problem?
Verify the input is wired properly.
-The input common is 0V.
-The input is where the voltage will be applied (source) or removed (sink).
Did wiring the input correctly resolve the problem?
Disconnect all other inputs and outputs.
- Many units do not have isolated inputs
Did disconnecting the other wires resolve the problem?
- First, verify that the input is not being inhibited or held in reset.
- Units without isolated inputs require that all the inputs share the same common. Ensure that all the inputs share the same common, or add external isolation.
Verify the input is at the proper voltage potential. Disconnect the input and monitor the voltage between the input and input common.
-Sinking inputs should measure a voltage
-Sourcing inputs should measure 0VDC
Did the input voltage measure the correct value?
Verify the input is changing the voltage levels.
* this may require an oscilloscope.
-Sinking Input:
-When the input is off, you should be measuring the same voltage as the previous step.
-When the input is on, it should be reading 0VDC.
-Sourcing Input:
-When the input is off, you should measure 0VDC.
-When the input is on, you should be measuring the voltage that the sensor outputs.
Are you reading the correct voltage?
Refer to the unit's manual and reset the unit to factory settings.
This will cause a counter to count pulses and a rate meter to display frequency in hertz.
Did resetting the unit allow the count and/or rate to display a non-zero value?
Scale the unit.
Refer to the How to Calculate a Counter Scale Factor to properly scale the counter or the unit's manual for rate scaling.
It appears there is a problem with the encoder.
Please contact Technical Support.
HMS Technical Support
Please visit the HMS-Networks tech support portal HMS Tech Support