Sabertooth 2x12 RC Motor Controller

[WinterDust]

I am currently working on a project to make an autonomous robot using motors and an SB-RIO board.

I purchased a 2x12 Sabertooth R/C Motor Controller for the motors, but when we attach it to our board there is only a constant voltage output.
No matter what we do we cannot get the signal coming from the board to vary.

Does anyone have suggestions of how to troubleshoot this issue?

Thank you.

[jkerns]

You might want to provide a little more information to allow those that know more about these things to be able to help.

You say that you are getting a constant voltage output - the controller has a duty cycle output - the maximum voltage out should remain constant, just the percentage of on time will change. How were you measuring the output? Did you try hooking up a motor?

"No matter what we do" includes doing what? I assume this is connected to a micro controller board? What range of pulsewidths have you commanded? Did you actually measure the output from your board? Do you have access to an oscilliscope?