4. External data input/output vie the M-232-C (V.24) data interface
During development of the TNC 151/TNC 155, great emphasis was given to shop floor-programming; the
operator is prompted by a plain language dialogue.
TNC 151/TNC 155 can also be programmed in standard G-Codes in ISO-format which is an advantage for
external programming.
For data transmission, the TNC 151 B/TNC 155 B can be switched to the following 3 operating modes via
the MOD-key:
ME - For connection of the HEIDENHAIN magnetic tape units ME lOl/ME 102.
Data format and the Baud rate 2400 have been adapted to the ME regardless of the programmed
values
FE - For connection of the HEIDENHAIN floppy disc unit FE 401.
Data transmission, such as’read-in, read-out or transfer blockwise is performed via a special protocol
for data protection.
Regardless of the entered values in the machine parameters for the RS-232-C (V.24) interface, data transmission
to the HEIDENHAIN peripheral units has been automatically adapted.
EXT - For adaptation of other peripheral units. The interface for data transmission is adapted via machine
parameters and the Baud rate is freely selectable.
Peripherals for the EXT-mode can be:
Tape puncher or reader
Printer or matrix printer for graphics print-out
Bulk memory or programming stations for transfer blockwise or external programming and program storage.
If a peripheral unit with another Baud rate is to be connected to the TNC 151/TNC 155 (without an inter-
mediate ME 101 or ME 102), the Baud rate of the TNC 151/TNC 155 will have to be re-programmed in the
sequence as follows:
Select operating mode by pressing
q
.
Press
q
or
q
several times unit1 the programmed Baud rate is displayed.
Enter new value for Baud rate (if different) (possible values: 110, 150, 300, 600, 1200,2400, 4800,960O
Baud).
Press
q
for entry into memory.
Graphics output onto a printer
When printing-out graphics, the control automatically switches to the operating mode “EXT” i
or “FE’‘-operation has been set via the MOD-function.
f “ME”
Control via XON/XOF F-protocol
When transmitting data with the characters ACK/NAK, DC1 is no longer transmitted in “handshake
operation” (MP 222).
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