6
Figure 1 legend
Item
Description
1.
RS-485 LAN cable. We recommend the use of 2-pair twisted shielded data cable such as
Belden 8723 for optimal performance.
2.
Join data cable shields where cable extends past a device that doesn’t have a LAN earth
connection.
3.
In each segment of LAN cabling, connect one end only of the data cable shield to a
device’s LAN earth terminal.
4.
External 12 VDC power supply (if needed).
5.
Do not connect the + from the external 12 VDC power supply to the + of the LAN.
6.
Terminate the control panel and the most distant device, or the devices at the ends of the
two longest LAN cable runs, as applicable.
7.
The RAS earth point should typically be connected to the data cable shield. Alternatively,
it may be connected to building electrical earth (for example, if mounting to an earthed
metal fixture).
System configurations
A Challenger LAN may be configured in a variety of ways:
• Straight LAN, where the Challenger panel is at one end of a LAN cable run
• Star LAN, where multiple LAN cable runs are used in a branched
configuration
• Multi-building, where the LAN extends to more than one building
LAN 1 is required and LAN 2 is optional. Each LAN must be independently
configured and terminated.
Straight LAN
In a straight configuration (Figure 1 on page 5), the Challenger panel is at one
end of the LAN cable run and all other devices are connected to the LAN cable.
The termination would be ON for the Challenger panel and for the last device on
the LAN.
Star LAN
In a star configuration, the LAN has at least two branches (Figure 2 on page 7)
optionally connected via a TS0844 Power Distribution Board
(see “TS0844
” on page 8). The termination would be ON for the two
devices at the ends of the two longest cable runs.
Note:
A star LAN configuration may consist of a number of cable runs
(branches). LAN termination should be ON only at the devices at the far ends of
the two longest branches. A star LAN that has multiple branches in excess of 100
m may need to use LAN isolation devices such as TS0893 LAN Isolation
Interface modules to isolate the LAN segments that do not have LAN termination
set to ON.
