# Character Mapping

Character mapping is used to change characters being sent from a source field to a target field.

## Remove NULL characters

Should nearly always be TRUE. NULL characters will be removed.

## Remove code value > 255

This can be used to remove all characters with a Unicode code value greater than 255 (decimal). This can be useful of your target system cannot handle non-ASCII characters.

## Map Characters

Character mapping can be used to change one character or range of characters to another characters.

For example, it might be necessary to map some control characters such as VT (vertical tab) or Bell to another safe value.

there are three columns in the grid:

### Look Start

First character in the look for range.

### Look End

Last character in the look for range - can be left blank, in which case the Look Start character will be used.

### Replace

The character that will be used to replace any character in the look for range.