8-8
Table 8-2 Cable Run Lengths
1. The circuit allowance per device on the loop is 0.5mA with the LED off, 2mA with
the LED on. A maximum of 20 LEDs get turned on at one time by IDNet Card (i.e.
in alarm).
2. The minimum voltage allowed at the furthest device to guarantee operation is
24.9Vdc. The
IDNet boosts its output voltage from nominal 30V to nominal 35V during alarm.
To connect the IDNet card to devices using Class A wiring, read the following
instructions and refer to the figure below.
1. Route wire between 0.75 mm
2
and 4 mm
2
from the IDNetB+, IDNetB- outputs
on TB1 of the IDNet card to the appropriate inputs on a peripheral IDNet device.
2. Route wire from the first IDNet device to the next one. Repeat for each
appliance.
3. Route wire from the last IDNet device to the IDNetA+ and IDNetA- inputs on
TB1 of the IDNet card.
4. Separate every 40 devices (maximum) with a coms isolator (e.g. 4090-9116).
5. Separate sounder bases or 6 point I/O modules in zones using the 4090-9117 Power
Isolate module.
+
1
2
1 212
Figure 8-5. Class A Wiring
Continued on next page
Wiring to IDNet Devices, Continued
Wire Size 0.75 mm
2
1 mm
2
1.5 mm
2
2.5 mm
2
4 mm
2
Resistance
Distance 385 m 513 m 769 m 1,282 m 2,052 m
20Ω
Distance 769 m 1,026 m 1,538 m 2,565 m 4,104 m
40Ω
Notes
Class A Wiring
IDNET CARD
IDNET DEVICES
0.75 mm
2
to 4 mm
2
SHIELD
SHIELD
FERRITE BEAD
FERRITE BEAD
(see fig 7.1)
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