HEIDENHAIN TNC 151 Q Mounting Instructions page 33

The following points should be observed when programming externally
a) A program must begin with the characters CR (Carriage Return) and LF (Line Feed). Both characters must
precede the first block otherwise they will be overread when entering via tape.
b) Every program block must finish with LF or FF !
c) The end of the last block must finish with LF, FF and ETX (End of text) or instead of ETX, the character
entered with machine parameter 71
d) Every block must contain all information that is requested by the dialogue display when programming.
e) The number of empty spaces between characters is optional.
f) On peripheral units, Even Parity-bit-check must be set.
g) A block contains maximum 64 characters.
h) With the aid of the characters "*" and ";" comments can be overread when reading-in to the TNC.
The character prefixes the comment after an NC block or at the beginning of each line - e.g. also
before the program. A comment is therefore ended with every LF + CR.
A compilation of block formats for TNC 151/TNC 155 is available from HEIDENHAI N.
The following wiring diagram is recommended for connection of a peripheral unit (e.g. printer with paper
tape reader/puncher).
Peripheral unit V.24 Adaptor connector
CHASSIS GND I 0 3
TXD
RXD ::i
RTS z= 0 4
CTS
0 5
DSR 6 -
0 6
SIGNAL GND
7 o 0 7
80 0 8
90
0 9
10 0 0 10
11 0 0 11
12 0 0 12
13 0 0 13
14 0
0 14
15 0
0 15
16 0 0 16
17 0 0 17
18 o
o
18
19 0 0 19
DTR 20 v
0 20
21 0
0 21
22 0 0 22
23 0 o 23
24 0 0 24
25 0 0 25
Key to signals:
--
TXD Transmit data
--
RXD Receive data
RTS Request to send
CTS Clear to send
DSR Data set ready
DTR Terminal ready
This is set after cancellation
of the error message "power
interrupted" (as of
software version 08)
The peripheral unit must be
set to Even Parity