Hi Pablo,
I think you are using the default CICS mode of the scale.
There should be another manual available for the IND560 that describes how to set the scale up for demand printing. once that is done, the scale will output a string with whatever is defined in the demand template, based on the demand printing triggers that you have defined, and PCo can receive that string directly. Depending on how you have formatted the template, you may be able to parse the string in a PCo Output expression and extract the values you need for PCo to send to the destination.
Regards, Steve