HEIDENHAIN ITNC 530 User Manual page 633

13.12 Select the Programming
Language for $MDI
Function
The Program input MOD function lets you decide whether to program
the $MDI file in HEIDENHAIN conversational dialog or in ISO format.
To program the $MDI.H file in conversational dialog,
set the Program input function to HEIDENHAIN
To program the $MDI.I file according to ISO,
set the Program input function to ISO
HEIDENHAIN iTNC 530 633