Installation Manual

Table Of Contents
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:
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:
Cable capacitance Overall cable length Cable capacitance Overall cable length
pF/ft ft pF/ft ft
< 17 7500 27 5185
18 7500 28 5000
19 7350 29 4828
20 7000 30 4700
21 6666 31 4516
22 6363 32 4400
23 6086 33 4242
24 5800 34 4100
25 5600 35 4000
26 5385 36 3800
Table 18.1: 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.
90 en | System wiring diagrams Control Panel
2016.05 | 14 | F.01U.287.180 Installation and System Reference Guide Bosch Security Systems, Inc.