Although Binary numeration is the base of computer numbering, it is cumbersome to deal with 1s and 0s. It turns out, however, that the system can be subsumed into a more convenient numbering system which allows a more accessible numbering convention. To do this, a system based on the number 16 is used. Sixteen is 2 x 4. A four digit binary number ( e.g. 0110, 0010, 1000 ) can be represented by a single hexadecimal number. the Hexadecimal digits are 0 to F. This is actually 0 to 9 and A to F. So A represents 10 ( in normal decimal notation), B represents 11 and so on. So the binary number 1001 0011 1110 can be represented in HEX (short for Hexadecimal) as 93E. Much more convenient.
the base sixteen number system. The digits used are 0,1,2,3,4,5,6,7,8,9,A,B,C,D,E, & F. You will see some values expressed in hex on some Digitrax throttles because with this system you can express numbers above decimal 99 as two digits.