Sensor Loops Overview And Wiring (B921C/B942/B942W Only) - Bosch B6512 Installation Manual

46 en | Keypads, keyswitches, keyfobs and transmitters
Wire to the control panel
Connect B Series keypads to the SDI2 bus by parallel wire run from the control panel to each
keypad, wire from keypad to keypad, or a combination of the two. For maximum wire lengths,
refer to the SDI2 Bus section of the table in Specifications, page 125 and the installation
instructions for each keypad.
Use a maximum of 7500 ft (2286 m) of 22 AWG (0.8 mm) wire for all devices connected to the
SDI2 bus combined.
3
Figure 9.1: Keypad to control panel wiring (B5512 shown)
9.1.10

Sensor loops overview and wiring (B921C/B942/B942W only)

The keypad detects three states (Open, Supervised, Short) on its sensor loops and sends the
conditions to the control panel. Each sensor loop has an assigned point number.
Use twisted-pair wire for the module sensor loops to avoid electromagnetic interference
problems. Run wires away from the premises telephone and AC wiring.
To wire detection devices to keypad inputs, connect them to the keypad terminals labeled for
COM, and 1, 2, 3, or 4. Wire resistance on each sensor loop must be less than 100 Ω with the
detection devices connected. The terminal strip supports 12 to 22 AWG (0.65 to 2 mm) wires.
Figure 9.2: Keypad inputs wiring (B921C shown)
2017.04 | 15 | F.01U.287.180
1
SDI2 ON-BOARD POINTS
Device Bus
Voltage Ranges
R Y G B
Open 3.7 - 5.0 VDC
Normal 2.0 - 3.0 VDC
Short 0.0 - 1.3 VDC
1 k End of Line Resistors
AUX
1 COM 2 3 COM 4 5 COM 6
- 12 V +
COM AUX R Y G B 1 COM 2 3 COM 4 5 COM
PWR A B COM
R
Y
G
B
1 Control panel
2 Keypad
3 Terminal strip wiring
1COM2 3COM4
C
OUTPUT
B
7 COM 8
6 7 COM 8
Installation Manual
Control Panels
2
Bosch Security Systems, Inc.