page 54 579-1150 Rev M
4010ES IDNAC Fire Alarm System Installation Guide
7.1.3 Class B wiring
Class B wiring requires the configuration jumpers to be set to positions 1-3 and 2-4. Two jumpers must be set for each circuit (refer to
Figure 42 for locations). Each of the two IDNet outputs provides short circuit isolation between itself and the others. A short on one output
is isolated from the others.
For Class B wiring only, both the B+, B- and A+, A- terminals are available for parallel connections. A+ is connected to B+, and A- is
connected to B- as shown in Figure 42. Additionally, two wires can be connected to each screw terminal. The result is that for Class B wiring
only, four parallel output branch circuits can be connected at the IDNet terminals.
Figure 42: Class B wiring
Note: Set jumpers to Positions 1 - 3 and 2 - 4 to select Class B operation. (See P1 and P2 in Figure 42 for correct orientation)
Note:
1. If no remote isolators or isolator bases are on the loops, device addressing can be assigned without concern for sequence.
2. If remote isolators or isolator bases are on the loops, the required addressing approach is to start at the A Loop output and
assign each successive isolator a higher address than the previous one. Follow this sequencing through to the B Loop.
3. For Class B wiring only, the “A” output and “B” output per loop are connected together in parallel for wiring convenience.
There are two considerations for addressing Class B wired IDNet devices connected to the IDNet terminal.
7.1.4 Class X wiring
For Class X wiring, see Class A wiring and add isolator devices along the loop.
7.2 ESS IDNAC wiring
The ESS has 2 IDNAC SLCs for power and communication wiring. Each IDNAC SLC on the ESS supports Class B wiring to 127 appliances
from the TrueAlert ES and TrueAlert Addressable lines.
Class B wiring allows “T” tapping. IDNAC SLC wiring is inherently supervised due to individual device level communications. End-of-line
resistors are not required.
For Class A operation, Dual Class-A Isolators (DCAI, 4100-6103) are required. P11 on the ESS has been provided for mounting one DCAI. Up
to three others can be installed (maximum two per IDNAC SLC) in available 4 inch x 5 inch blocks.
Class X operation requires the use of Dual Class-A Isolators (DCAI, 4100-6103) and IDNAC isolator devices.
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