Usually, Data Matrix barcodes use character values of up to 128. However, it is possible to create Data Matrix barcodes with values in the full range of 0 to 255. This article describes how.
First, you must change the barcode compaction mode to Binary.
When the barcode control is in binary mode, you can then write encoded hex character values in your source expression.
The hex values are encoded as \x followed by two digits. For example, a capital A has the decimal character value of 65. The hex value is 41. This means that \x41 in the source expression will represent a capital A in the barcode.