Created Date: March 13,2020

Created by: dsabol

I have a use case where the user needs to manually rotate the motor to a position, and then I need to be able to know what that position is. The only way I have found to do this is to disable the motor with the "MD " command, then have the user rotate the motor, but the "SP " command stops tracking the position during this time.

Is there another mode I can use where the user can turn the motor and the position is tracked? I will be adding an encoder, so will I be able to track the position still with the "EP " command?

Created Date: March 13,2020

Created by: Tinker

What drive are you using? since you mention SP and MD commands I'm guessing it is a SCL capable drive, but you also mention adding an encoder, so I'd guess you are using one of the integrated motor/drives?

The only practical way to do what you want is to have an encoder, but you wrote "will be adding an encoder " (future tense) that implies you are not using an encoder now. One would hope that once an encoder is added the drive (supposing the dive is equipped to receive an encoder input) will keep track of position even when the drive is disabled.

However, not knowing what drive you are using, I can't say for sure.

Created Date: March 16,2020

Created by: dsabol

I'll take a look at adding jog functionality, although right now I only have SCL to communicate, since I need to keep the encoder lines free for the encoder. If I can't control the jogging through SCL, I guess I can always mimic the behavior.

I am using the STP-DRV-4850 driver with an STP-MTRL-14034E motor and an AMT112Q-0400 encoder from CUI Devices. I'm currently using SCL to communicate with the drive. The drive has encoder inputs.. I say "will be adding " because currently I can't get the encoder to work. I verified the output with an oscilloscope, but when I try ti use the "EP " command over SCL I get an unknown command response.