Each hexadecimal digit converts to a 4-digit binary string as follows:0 = 0000, 1 = 0001, 2 = 0010, 3 = 0011,
4 = 0100, 5 = 0101, 6 = 0110, 7 = 0111,
8 = 1000, 9 = 1001, A = 1010, B = 1011,
C = 1100, D = 1101, E = 1110 and F = 1111.
So, for example D3A (hex) = 110100111010 (Binary)