There really isn't anything to configure. All of the below options will give you the same results. 0x7E is just the hex value 7E or Decimal 126. You can use the ASCII chart in the back of the manual. Also I find the following link to MELabs helpfull. http://www.melabs.com/resources/convert.htm

Variables
Byte1 var $7E, Byte1 var 126, Byte1 var "~", Byte1 var %01111110

Constants:
Byte1 con $7E, Byte1 con 126, Byte1 con "~", Byte1 con %01111110