Netum NT-1228BL Setup Manual page 16

Transmit Code 39 Check Digit
Scan this symbol to transmit the check digit with the data.
Scan this symbol to transmit data without the check digit.
Enable/Disable Code 39 Full ASCII
Code 39 Full ASCII is a variant of Code 39 which pairs characters to encode the full ASCII character set.
NOTE Trioptic Code 39 and Code 39 Full ASCII cannot be enabled simultaneously. If you get an error beep when
enabling Code 39 Full ASCII, disable Trioptic Code 39 and try again.
*Do Not Verify Code 39 Check Digit
Transmit Code 39 Check Digit (Enable)
*Do Not Transmit Code 39 Check Digit
Enable Code 39 Full ASCII
*Disable Code 39 Full ASCII