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A Challenger LAN should have only two devices with the LAN termination set to
ON (or the LAN termination resistor fitted):
• In a straight LAN configuration (Figure 1 on page 5) the termination is ON at
the Challenger panel and the most distant device.
• In a star LAN configuration (Figure 2 on page 7) the termination is ON at the
two devices that are the furthest apart (and OFF at the Challenger panel
, if it’s
not at the end of one of the longest cable runs).
See also “Star LAN”
In a completely-connected (but powered down) system, you can check for correct
LAN termination by measuring the resistance across the Challenger panel’s D+
and D- terminals:
• 0 Ω indicates a short circuit in the cabling
• 160 Ω or less indicates that three or more devices are terminated
• 220 Ω is good (two devices are terminated)
• 470 Ω or more indicates that less than two devices are terminated
Checking LAN performance
Use Install menu option 23 Poll Errors to check for poll errors on the LANs. If the
rate of poll errors seems excessive, check the LAN cabling and termination.
Zone inputs
Zone inputs are also known as alarm inputs. A Challenger system can receive
alarm signals from:
• The Challenger panel’s onboard inputs
• Inputs connected to Data Gathering Panels (DGPs)
Note:
Input numbers in the range 1000 to 1008 will not report CID alarms.
Each pair of zone input terminals may be connected to an alarm system device,
such as a detector or reed switch.
By default, the Challenger system monitors zone inputs for four states (sealed,
unsealed, open circuit, and short circuit) when used with two end-of-line (EOL)
resistors in each zone input circuit, as shown in Figure 7 on page 18. The default
EOL resistor value is
10 kΩ but can be changed for the panel’s onboard inputs
via System Options.
Install EOL resistors in zone input circuits at the end of the circuit. If an alarm
device is connected, place the EOL resistors at the device’s connections. If a
zone input is not used
, you don’t need to connect an EOL resistor if you program
the corresponding input number as type 10 (spare).
Tip:
Use sleeves on the resistor leads to prevent accidental shorting.
