27 – 498 HEIDENHAIN Service Manual iTNC 530
27.6 BTS 1x0 Monitor/Keyboard Switch
Two monitors (BTS 110: 2 x BF 120, BTS 150: 2 x BF 150) and two TE keyboards can be
connected to an MC 42x(B) 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.
A jumper on the PCB is used to determine which potentiometer 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
Assignment of the individual connections:
--> See “Keyboard Units” on page 27 – 495
--> See “Monitors” on page 27 – 493
X3:
Switchover
between the
keyboards
Depending on the signal at X3, one of the keyboards at X4 or X5 is activated:
X8:
Supply voltage for
BTS 1x0
Power supply with double insulation in accordance with EN 61800-5-1.
Current consumption: Max. 100 mA.
Jumper setting Active potentiometers
Always keyboard 1 (at X4)
Currently active keyboard
You cannot switch between the two touchpads on the TE 53x with the BTS 1x0.
You must connect both touchpads to the MC 42x (B/C) (possibly via the USB hub).
Connection designation Monitor/Keyboard
X1 Input BF 120 or BF 150
X2 TE input
X4 First TE output
X5 Second TE output
X6 First BF 120 or BF 150 output
X7 Second BF 120 or BF 150 output
The interface complies with the requirements of EN 61800-5-1 for "protective extra-low
voltage" (PELV).
Signal at X3 Active keyboard
Terminal 1 Terminal 2
0 V0 VAt X4
+24 V 0 V At X5
Connecting terminal Pin layout
1+24 V
20 V
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