14 Challenger10 Installation and Quick Programming Manual
Auxiliary power terminals
Connect the + and – auxiliary power output terminals to devices that require
12 VDC power, such as detectors. Four sets of auxiliary power output terminals
are provided: if you need more than four connections you can use a TS0844
board to increase the number of terminals (see “TS0844 Power Distribution
Board” on page 8).
RS-485 LANs
Use 2-pair twisted shielded data cable such as Belden 8723 to connect the
Challenger panel to system devices such as RASs and DGPs.
• Connect the + terminal to the red wire. The + terminal provides +12 V to LAN
devices such as RASs (within 100 m cabling distance).
• Connect the – terminal to the black wire. The – terminal provides -ve DC to
LAN devices such as RASs, and common 0 V for the RS-485 LAN.
• Connect the D+ terminal to the white wire. The D+ terminal is data positive.
• Connect the D– terminal to the green wire. The D– terminal is data negative.
• Connect the data cable shield to the LAN earth connection (Figure 5 on page
11, item 1).
The RS-485 LAN may be used to power devices up to 100 m cabling distance
from the Challenger panel. See “Power supply to RS-485 LAN devices” on page
4 for details.
One set of terminals is provided for each LAN, if you need more than one
connection you can use a TS0844 board to increase the number of terminals
(see “TS0844 Power Distribution Board” on page 8).
Terminating the RS-485 LANs
All Challenger LAN devices (including the panel) use a 470 Ω LAN termination
resistor where required. LAN termination resistors are used to set the impedance
of the LAN to around 220 Ω in order to minimise noise. The termination resistor
may be external or onboard (devices with an onboard resistor use a link or a DIP
switch to set the LAN termination to ON).
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 TERM links are ON at
the Challenger panel and the most distant device.
• In a star LAN configuration (Figure 2 on page 7) the TERM links are 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” on
page 6.
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
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