Power
iSTAR Ultra Installation and Configuration Guide 2–15
Heat Dissipation
Table 2-7 on page 2-15 lists the heat dissipation for the rack and wall mount configurations.
Reader Data 
(Direct 
Wiegand 
Connection)
iSTAR 
Ultra or 
RM-4/4E 
module
Proximity/ 
Wiegand 
signaling 
read head
9942
9260
Alpha wire 
5386C
22
20
18
3 Yes 200 ft.
(60.96 m)
300 ft.
(91.4 m)
500 ft.
(152.4 m)
3.2 
3.2 
3.2 
a. To comply with UL requirements, use shielded, minimum 22 AWG stranded, twisted pair cable for monitor points,
supervised inputs, 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 ft.) 
- Using 18 AWG, distance = 1500 ft. (.0065 ft.)
Table 2-6:  Equipment Wiring Specifications, continued
Signal From To
Belden # 
or equiv.
AWG
# 
Prs
Shield
Max 
Length
Max. Wire 
Resistance
NOTE
 The Tamper, Low Battery, and AC power fail inputs must be enabled 
and connected to the iSTAR Ultra to report for compliance with UL 
requirements.
 For UL listed products, burglar alarm inputs must be supervised.
 UL Listed panic hardware shall be used to allow emergency exit from 
a protected area.
 The USTAR-GCM AC Fail/Lo Batt and COMM, USTAR-GCM and 
USTAR-ACM Tamper, USTAR-GCM power, USTAR-ACM power 
(Reader), USTAR-ACM lock 1 and lock 2 connections are not to leave 
the room of installation or 25’ beyond control unit. Therefore, these 
connections were not tested for output transients.
Table 2-7:  Heat Dissipation 
Configuration
Power Dissipated in 
Enclosure
BTU/hour
Rack GCM 17.88 Watts 61.0
Rack ACM 6 Watts 20.5
Wall GCM and (1) ACM 23.88 Watts 81.5
Wall GCM and (2) ACMs 29.88 Watts 102.0