I guess that Serial.print is giving you a decimal representation of the ascii code received from the reader, but since you haven't separated the bytes it's impossible to tell what the byte values were.
If you think the values are ascii characters, you could convert the byte to a char before printing which would cause the print method to print the byte as-is. However, if it encountered a non-printable character then the output may not be too helpful. It's worth a try though, just in case it turns out that the data is actually printable ascii.
If it's not ascii then you can either print it in decimal with a separator (for example, space) between each byte, or print it in hex so that the number of characters printed per byte is known.