Sato Printer and SLC 504

I have a Sato M840Pro-2 Printer that is linked to a SLC 5/04 processer through a Prosoft communication card. The SLC sends information in ASCII to the sato to print on a label. There is a photo eye in the printer that detects if a label has been printed, but not removed. I am looking for a way to communicate this information back to the SLC. Would this be even possible? If so, what would the code look like. I am not familiar with these printers and would appreciate any help. If more details are needed, feed free to ask.

https://www.satoamerica.com/uploads/files/datasheets/E%20Pro%20Programming%20Reference.pdf

The above is the programming reference for the M84Pro printer. We use Loftware to control these printers. Modbus TCP reads the barcode which was scanned into the PLC and then the label is printed.

Regards,
Garry
http://www.accautomation.ca

Thank you for the manual. I think I should post an update on where I am at in this problem.

I have found the manual and found the respective codes in the slc. I have found that the smc sends an enq command using alternative symbols (@) at set intervals. I have also found that between these enqs it sends the following ascii line:

{^A^*^Z}

I believe this is to clear the buffer.

In the manual, under the bi com section, it mentions a SG command, which would return the signal levels of the sensor. I believe this is what I want. However I cannot structure the line correctly to get this return.

Does anyone have an idea on the structure that this should be in?