Isc hex

ISC_HEX

Type Function	BOOL
Input IN	BYTE (characters)
Output	BOOL (TRUE IN a sign is 0..9)
	ISC_HEX tests whether a sign IN is a hex character, If IN is a sign 0..9, A..F, a..f the function returns TRUE if the function returns FALSE.
	The signs are 0..9 are the codes (48..57)
	The characters A..F are the codes (65..70)
	The characters a..f are the codes (97..102)