HEIDENHAIN ND 231 B v.2 - Manual (Page 41)

41
Baud rate
Measured value output with CTRL B
If the display unit receives the control character STX (CTRL B)
over the RS-232-C/V.24 interface, it immediately transmits the
current measured value back over the interface. CTRL B is
received over the RXD line of the interface, and the measured
values are transmitted over the TXD line.
The measured value can be received and saved using a
terminal program (e.g. HyperTerminal, which is a component
of Windows®).
The basic program below shows the fundamental structure of
a program for measured value output.
Characteristic times for measured value output
Process Time
Storage after t
1
£ 1 ms
Measured value output after t
2
£ 50 ms
Regeneration time t
3
³ 0
If functions such as series of measurements with
DIFF value display are active, these times are
prolonged.
Duration of measured-value transfer
t
D
= [s]
Signal transit times for measured value output after "Ctrl B"
BASIC program for measured value output over “Ctrl B”
10 L%=18
20 CLS
30 PRINT "V.24/RS-232-C"
40 OPEN "COM1:9600,E,7" AS#1
50 PRINT #1, CHR$ (2);
60 IF INKEY$<>""THEN 130
70 C%=LOC(1)
80 IF C%
90 X$=INPUT$(L%,#1)
100 LOCATE 9,1
110 PRINT X$;
120 GOTO 50
130 END
t
1
t
2
Ctrl B
t
D
t
3
Ctrl B
187 + (11 • number of blank lines)
RS-232-C/V.24 Data Interface (X31)