Re: Further OMS PC78 questions

[Mark Rivers via Tech-talk <tech-talk@aps.anl.gov>]

Please send the complete output from asynTrace on the underlying asyn port when the IOC starts up.

Mark

Sent from my iPhone

On Dec 4, 2025, at 3:21 PM, James P. Withrow via Tech-talk <tech-talk@aps.anl.gov> wrote:



Yes, I do not receive a response from the controller when it is sending the three "WY" commands from the driver. I have seen the response before in this transaction, but I haven't been able to get it to reoccur so far. If I send "WY" to the .AOUT field of the asyn record for the port with caput, I do get back the expected response, and I can see the logging messages scroll past in the IOC. 

Is there something different that the driver is doing to send the commands vs. caput/caget?

I've put the line 'var "drvOmsPC68debug", 10' in my st.cmd file, but it doesn't appear to be generating any additional output

Thanks!

-Jim

Jim Withrow, Research Support Specialist - jwithrow@cornell.edu

NE-CAT, Cornell University - https://necat.chem.cornell.edu

Advanced Photon Source, Sector 24

9700 S. Cass Avenue, Building 436 E001

Lemont, IL 60439

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From: Peterson, Kevin M. <kmpeters@anl.gov>
Sent: Thursday, December 4, 2025 10:35 AM
To: James P. Withrow <jwithrow@cornell.edu>; Tech Talk EPICS <tech-talk@aps.anl.gov>
Subject: Re: Further OMS PC78 questions

 

Jim,

The "card does not exist" error means the driver didn't receive a response from the firmware very query of the controller in the motor_init function:

https://nam12.safelinks.protection.outlook.com/?url="">

There is a debug variable, drvOmsPC68debug, that can be set to a non-zero value before iocInit to enable debug messages to be printed:

var "drvOmsPC68debug", 10

That should give us more information about what is failing.

Kevin