For each element of the list, enter a value between 0 and 255, i.e. an unsigned byte value. The following screenshot shows an example with five elements. Notice that they are numbered from 0 to 4. Byte Array - Initialize an array. Elements of a Byte Array can be accessed in a Calculate block or as a Data Connection (if you specify Edit values directly) by getting the array and using the syntax Data[index] where index is the number of the element in the array starting from zero.