Sdi2 Bus Wiring Recommendations - Bosch D9412GV4 Installation Manual

3.5.1

SDI2 Bus Wiring Recommendations

Use the following SDI2 bus wiring recommendations for SDI2 installation. The SDI2 bus is
used by the GV4 Control Panel and corresponding modules to communicate with one another.
Modules can be connected via home run, daisy chain, or single level T-tapped anywhere on the
SDI2 bus.
Figure 3.11: SDI2 Bus Wiring
Callout ￚ Description
1 ￚ Control panel
2 ￚ SDI2 module
3 ￚ Daisy chained wiring
4 ￚ Single-level T-tapped wiring
5 ￚ Home run wiring
If the voltage at any device is below the minimum, you must add an auxiliary power supply to
the system to power these devices.
Notice!
The absolute lowest voltage for the SDI2 devices is 10 VDC at the device terminals when in
normal operation, with a fully charged battery on the system.
Maximum cable lengths
The following rules must be followed when wiring the SDI2 bus.
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Bosch Security Systens, Inc.
The SDI2 bus requires the use of non-shielded cable from 12 AWG to 22 AWG.
Maximum overall cable length based on the table listed below:
UL Installation Guide
Diagrams | en 19
2016.07 | 04 | F.01U.291.483