Tyco iSTAR Ultra Installation And Configuration Manual page 104

Door controller
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FAI Connections
Signal
RS-485 Comm, Data
Half-duplex 2 wire
RS-485 Comm, Power
RJ45-Ethernet
6–28
iSTAR Ultra Installation and Configuration Guide
Tolerance if sourced by an external power supply.
To determine the maximum distance of a reader from an iSTAR Ultra, calculate the voltage
that reaches each reader. If the voltage is insufficient, you can shorten the wire length, use a
heavier wire, or add UL294 power-limited power supply.
Wire resistance is as follows:
• 24 AWG = 26.0

• 22 AWG = 16.5

• 20 AWG = 10.2

• 18 AWG = 6.5
per 1000 ft.

You must consider the wire length both to and from the reader, in the
NOTE
calculation.
Example:
•The RM-4 is 500 feet away. (1000' round trip)
•The RM-4 draws 250 mA. and is connected with 20 AWG wire.
The equation to calculate voltage drop is:
E= I*R
I = .25 A (250 mA)
R= 10.2 ohms (from the table)
E= .25 * 10.2
E= 2.55 (voltage drop)
12 Vdc - 2.55 Vdc = 9.45 Vdc
The connection meets the requirement.
x
Table 6-9
on page 6-28 lists the general wiring requirements for an iSTAR Ultra and its
components.
Table 6-9: Equipment Wiring Specifications
From
To
iSTAR Ultra
RM & I/O
Modules
iSTAR Ultra
RM & I/O
Modules
iSTAR Ultra
Hub, Host
per 1000 ft.
per 1000 ft.
per 1000 ft.
Belden #
or equiv.
AWG
9841
24
8442/8461
22/18
N/A
Shielded
Cat-5E
or better
#
Max
Prs
Shield
Length
1
Yes
4000 ft.
(1212 m)
1
Yes
Range of
600 ft. to
1500 ft.
depends
on AWG
2
Yes
328 ft.
(100 m)
Max. Wire
Resistance
103
2
See Note
8.4 

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