3 – 100 HEIDENHAIN Technical Manual TNC 426, TNC 430
3.20 BTS 1x0 Monitor/Keyboard Switch
Two monitors (BTS 110: 2 x BC 120, BTS 120: 2 x BF 120) and two TE 420
keyboards can be connected to an LE with the BTS 1x0.
The two monitors are always active. Switchover between the two keyboard
units is realized by a 24 V switching input on the BTS 1x0.
With the BTS 110, the potentiometers of the current keyboard are active. With
the BTS 120, a jumper on the PCB is used to determine which potentiometers
should be active. The jumper is on the upper PCB next to the ID plate.
X1, X2, X4,
X5 to X7: Monitor
and keyboard
connections
Refer to the Sections “TNC Operating Panel” and “Visual Display Unit” for the
pin layouts of the individual connections.
X3: Switching
between keyboards
Depending on the signal at X3, one of the keyboards at X4 or X5 is activated:
X8: Supply voltage
for BTS 120
Pin layout on the BTS 120:
Jumper setting Active potentiometers
Always keyboard 1 (at X4)
Currently active keyboard
Connection designation Monitor/Keyboard
X1 Input BC 120 or BF 120
X2 Input TE 420
X4 1st output TE 420
X5 2nd output TE 420
X6 1st output BC 120 or BF 120
X7 2nd output BC 120 or BF 120
Note
The interfaces comply with the requirements of EN 50 178 for “low voltage
electrical separation.”
Signal at X3 Active keyboard
Terminal 1 Terminal 2
0 V0 VAt X4
+24 V 0 V At X5
Connecting terminal Assignment
1+24 V
20 V
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