Compuprint MDP 30FB Programmer's Manual page 113

DC4 DC4 ESC ! n 20 p EM
Code 39
The CODE 39 bar code. Data format length is variable and must always
start and end with an asterisk. It can contain the alphanumeric character
listed below:
0 1 2 3 4 5 6 7 8 9
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
+ % *
The parameter indicates the bar code height in units of 1/6 inch and must be
in the range 1 to 12. The p parameter must be NUL (hex. 00) if no Human
Readable Characters are to be printed, and 1 (hex. 01) if they are to be
printed.
DC4 DC4 ESC! n 22 p EM
CODABAR
The Codabar bar code data fields do not have a defined format length and
contain data belonging to the character set listed hereafter:
0 1 2 3 4 5 6 7 8 9 - $: /. +
A B C D E N T * a b c d e n t (only as START/STOP characters)
The printer allows any combination of START/STOP characters. If the first
and last characters of the received string do not belong to the START/STOP
characters subset, question marks will be printed in place of HRC string, if
possible.
( as start / stop character)
111
-. SPACE $ /