Not possible to set barcode length1 when decoding Datamatrix

I am using a TC77 to scan datamatrix barcodes.

Is there any way to only decode a datamatrix with a specific length? There are no length decode parameter in the api or datawedge.

The reason is that we have a label with two different datamatrix barcodes close to each other, and would like only to scan the one with a text content length of 123 chars. Changing the label is unfortunately not an option.