Johnson Controls tyco iSTAR Ultra, Installation And Configuration Manual

Page: 87 / 118

Inputs
iSTAR Ultra Installation and Configuration Guide 5–21
NO/NC Dual EOL 1K
Figure 5-16 on page 5-21 shows the traditional Software House method of supervision where
1K

is considered Secure and 500

or

are considered Alert. Notice that the wiring is
different for NO and NC.
Figure 5-16: NO / NC Dual EOL 1K
This method will report:

Short

Alert (500 ohms)

Normal (1K)

Alert (2K)

Open (>30K)

Line Fault (Any unexpected value) Usually due to wrong value resistors or faulty
resistors.
NO/NC Dual EOL 5K, 10K
Figure 5-17 on page 5-22 shows a method similar to the traditional Software House method of
supervision.

For 5K resistors - 5K = Normal. NO Alert = 2500 ohms, NC Alert = 10K

For 10K resistors - 10K = Normal. NO Alert = 5K, NC Alert = 20K
Notice that the wiring is different for NO and NC.
For UL Listed products,
burglar alarms must be supervised.