Maxium Loop Resistance per loop is 25 Ohms.
More Information about the Polling Loop:
- Sensor Circuit: The D10024 and D10024A supports up to five D9067 Polling Circuit Modules. The D9024 up to three D9067 Polling Circuit Modules, and the D8024 supports up to two D9067 Polling Circuit Modules. Up to 7,200 ft. (2,195 m); #16 AWG (1.5 mm) wire per polling loop card; supports Class A wiring
- Sensor Circuit Wiring Requirements: 28 pF/ft. nominal capacitance; 3 W/1,000 ft. typical cable resistance; 25 W maximum loop resistance; recommended maximum loop capacitance should not exceed 0.25 μF
- Maximum Number of Devices: 126 per polling loop card
- Sensor Circuit Protection: short circuit protection on-board (without isolators in circuit D333A)
- Sensor Current: 150 μA typical
Note: The nominal capacitance for shielded single pair twisted cable wiring must not exceed 29 pF per foot.
Detection devices in the analog system receive power and communicate with the control panel over a two-wire circuit. This digital communications format resists interference from most types of EMI and RF generated noise. Use shielded cable for all detection circuits. Terminate the shield to the earth ground terminal on the D10024 Control Module. Mineral insulated copper cable (MICC) provides superior screening. Ground the drain wire to the earth ground terminal on the D10024 Control Module.
Bosch Security Systems, Inc. recommends shielded single pair twisted cable wiring with a drain wire such as Atlas #218 or West Penn Wire/CDT #D293. West Penn Wire/CDT #D293 has a nominal capacitance of 28 pF/ft between conductors.
Polling circuits may be wired as Class A or Class B circuits. Bosch Security Systems, Inc. recommends Class A configuration with the wiring returning to the D9067 Polling Circuit Module. This allows the module to poll the circuit in both directions, ensuring circuit operation in the event of a single break in the wiring and allowing the panel to identify the location of the break.
Polling Circuit Length Wire Gauge Up to 4,000 ft (1,219 m) 18 AWG (1.2 mm), 4,000 ft to 7,000 ft (1,219 m to 2,134 m) 16 AWG (1.5 mm)
