5-3
Chapter 5 4007ES Power Supplies
IDNet Section, Continued
Device
Addressing
(Class A and
Class B)
• If no remote isolators or isolator bases are on the loops, device addressing can be assigned
without concern for sequence.
• If remote isolators or isolator bases are on the loops, the required addressing approach
is to start from the “B” side and assign each successive isolator a higher address than the
isolator it precedes.
• For Class B wiring only, the “A” output and “B” output per loop are connected together
in parallel via a jumper.
Wiring Wiring Parameters
Table 5-2 identifies the IDNet wiring parameters that must be considered when installing this
card. For additional wiring information, refer to document 900-408, Simplex Addressable Fire
Alarm Panels Field Wiring Specifications.
Table 5-2. IDNet Wiring Parameters
IDNet Wiring Capacitance Parameters
Parameter Value
Maximum Supported Channel Capacitance The sum of line-to-line capacitance, plus the capacitance of
either line-to-shield (if shield is present) = 0.6 µF
IDNet Wiring Class A and Class B Limits
Channel Loading Up to 125 devices 126 to 250 devices
Max. resistance to compatible devices.
(Include the 2081-9044 Overvoltage
Protector resistance when applicable)
50 ohms maximum 35 ohms maximum
Maximum wiring distance*:
(18 AWG, 16 AWG, 14 AWG, 12 AWG)
4000 ft (1219 m) 2500 ft (762 m)
*Notes:
• The "maximum wiring distance" is the maximum
distance from both the IDNet control terminals (primary
and return) to the farthest device on the circuit. See
Figure 5-2.
• Maximum wiring distance is determined by either
reaching the maximum resistance, the maximum
capacitance, or the stated maximum distance,
whichever occurs first.
• The total circuit cable load (amount of cable used) must
not exceed 12,500ft (3,8km).
Figure 5-2. Maximum Wiring Distance
IDNet Wiring Considerations
using 2081-9044 Overvoltage
Protectors
(2081-9044 is UL listed to
Standard 1459, Standard for
Telephone Equipment)
External wiring must be shielded (for lightning suppression) and 2081-9044
Overvoltage Protectors must be installed at building exit and entrance locations.
For more information, refer to the Model 2081-9044 Overvoltage Protector Installation
Instructions, 579-832.
Capacitance; each protector adds 0.006 µF across the connected line.
Resistance; each protector adds 3 ohms per line of series resistance; both IDNet wires
are protected; 6 ohms per protector will be added to total loop resistance.
Maximum distance of a single protected wiring run is 3270 ft (1 km).
Refer to document number 574-832, 2081-9044 Overvoltage Protector Installation
Instructions, for additional information.
XXXX ft maximum to
farthest device from
either end of loop
Device
Device
Device
Control Terminals
(Class A wiring example)
Device
Control Terminals
(Class B wiring example)
Device
Device
Total cable load
must not exceed
12,500ft (3,8km)
Device
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