Power
11
Wiring Requirements
The iSTAR Ultra Ethernet connections are:
Two GCM Onboard Ethernet ports – support 1 Gbps each
Tabl e 4 on page 11 lists the general wiring requirements for an iSTAR Ultra and
its components.
NOTE
Use shielded Ethernet cabling. CAT5 or better.
The Power Input terminals on the iSTAR Ultra accept conductor size up
to 2mm
2
(12 AWG).
Table 4. Equipment Wiring Specifications
Signal From To AWG Shield Max Length
RS-485 Comm, Data
Half-duplex 2 wire
iSTAR Ultra RM & I/O
Modules
22 Yes 4000 ft.(1212 m)
RS-485 Power iSTAR Ultra RM & I/O
Modules
22/18 Yes Range of 600 ft. to 1500 ft.
depends on AWG
b
RJ45-Ethernet iSTAR Ultra Hub, Host Cat 5 or better Yes 328 ft. (100 m)
Supervised Input iSTAR Ultra
or I8
Input 22/18 Yes 2000 ft. (606 m)
Request-to-exit
(REX or RTE)
iSTAR Ultra
or RM-4/4E
module
Switch 22/18 Yes 2000 ft.(606 m)
Door State Monitor
(DSM)
iSTAR Ultra
or RM-4/4E
module
Contact 22/18 Yes 2000 ft.(606 m)
Supervised Input (UL)
Note
a
iSTAR Ultra
or I8
Input 22 Yes 2000 ft.(606 m)
Reader Data (Direct
Wiegand Connection)
iSTAR
Ultra or
RM-4/4E
module
Proximity/
Wiegand
signaling
read head
22
20
18
Yes 200 ft.(60.96 m)
300 ft. (91.4 m)
500 ft. (152.4 m)
a. To comply with UL requirements, use shielded, minimum 22 AWG stranded, twisted pair cable for monitor
points, DSMs, and REXs. Use Belden 9462 or equivalent.
b. Check wire lengths to verify that voltage drops are acceptable.
Calculations are based on a single RM-4 reader with keypad and LCD (250 mA):
Using 22 AWG, distance = 600 ft. (.0165 ohms /ft.)
Using 18 AWG, distance = 1500 ft. (.0065 ohms /ft.)
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