Output To External Devices; Reading In And Simultaneously Executing Programs - HEIDENHAIN TNC 415 Technical Manual

When outputting the file, the error messages, dialogs and text files are all output as ASCII files
with the code A.*. Consequently, if they are sent on an external data carrier, these files must
have different file names so that they are not overwritten by files with similar names.
If the files are read in again, they are first of all stored as ASCII files and have to be converted
back to the original file-type by the user.
The menu functions "Read all files", "Read files with acknowledgement" and "Show ext. directory"
only work with files which contain the name concerned at the start of the file (NC programs and
tables). The remaining files (PLC, error, dialog and ASCII files) have to be read in individually.

2.4.2 Output to external devices

Any external device, e.g. computers, printers, readers and punches, can be addressed via either of
the two interfaces.
For this purpose, the TNC has three freely configurable interface modes (EXT1/EXT2/EXT3) which,
within certain limits, permit any setting of the data format and control characters of the required data
transmission protocol.
The setting selected at the external devices must of course match the TNC. On printers, this is done
by setting the DIP-switches or adjusting the transmission parameters.
If data transfer to a computer is desired, appropriate data-transfer software must be installed. To
help in this, HEIDENHAIN offer their TNC.EXE data transfer software, which permits transfer
between TNC and a PC using a fixed transmission protocol.

2.4.3 Reading in and simultaneously executing programs

(DNC operation)
In RUN PROGRAM mode with "Block transfer", machine programs can be transmitted from an
external memory or the FE floppy disk unit via serial data interfaces and be executed simultaneously
(DNC operation). This allows machine programs which exceed the storage capacity of the control
unit to be executed.
After the program has started, executed blocks are erased and further blocks are continuously called
from the external memory.
The minimum and maximum memory requirement for the drip feed mode is defined with machine
parameters MP7228.0 and MP7228.1 respectively. The maximum memory requirement can also be
set to leave enough spare for parallel programming during execution.
The error message "Program Memory Overflow" is output if the minimum storage is not enough.
If the program blocks are read into the TNC faster than they can be executed, the entire NC memory
is initially fully loaded up to the maximum memory limit (MP7288.1). If it is full, transfer is suspended
until a storage space of 256 bytes is vacated by execution. Only then is transfer resumed, until once
again the memory is filled.
01.98 TNC 407/TNC 415/TNC 425 2 TNC data interfaces 8-19