Bosch B6512 Installation Manual page 80

80 en | System wiring diagrams
Notice!
There can only be a difference of 2 volts (maximum) between the AUX power terminals of the
control panel or power supply and the device for the modules and keypads to work properly
under all conditions.
Maximum cable lengths
Follow these rules when wiring the SDI2 bus:
–
–
–
Cable capacitance
pF/ft
< 17
18
19
20
21
22
23
24
25
26
Table 18.11: Maximum cable length
Notice!
Use unshielded cable only.
Maximum capacitance of 140nF (140,000 pF) per system. Contact the wire manufacturer for
the capacitance ratings of the wire being used.
2017.04 | 15 | F.01U.287.180
The SDI2 bus requires the use of unshielded cable from 12 AWG to 22 AWG.
Refer to the SDI2 device or keypad documentation for the allowable maximum distance
from the control panel.
Maximum overall cable lengths are listed in the following table:
Overall cable length
ft
7500
7500
7350
7000
6666
6363
6086
5800
5600
5385
Cable capacitance
pF/ft
27
28
29
30
31
32
33
34
35
36
Installation Manual
Control Panels
Overall cable length
ft
5185
5000
4828
4700
4516
4400
4242
4100
4000
3800
Bosch Security Systems, Inc.