The VI
Fail-Safe Device
Note: This section is not applicable for the
Only mode
connect any keypads to the
RS-485 network).
Power to the fail-safe device is routed from
system console. If you need to power the device
directly, you can use pins 7
VAC) and 9 (-12 VAC) on the
terminal block located on the
fail-safe device (pin 3 is ground).
To daisy-chain system consoles, you will need one
Fail-Safe Device for every two consoles.
These devices provide a continuous chain of communication in case one system console loses power or
communications. The
is sold separately and includes two 8 ft (2.4 m) RJ-45 terminated
cables in its accessory kit.
Note: The
Intelligent Remote Control Panels include an internal fail-safe circuit. If you
use a
as the first device in a two-keypad daisy-chain, you will not need the
Fail-Safe Device. However, if the system console is the first device, then you will need
the
regardless of whether a system console or a
is next in line.
Only standalone systems may include
Figure 10 shows a block diagram for a daisy-chained system with two system consoles and Figure 11
illustrates the connections for this configuration.
Figure 10
Block Diagram of Two System Consoles in a Daisy-Chain Configuration
Cable provided in
Accessory Kit,
Figure 11
Connections with Two System Consoles
X923 Rev 1099 System Console
The
Fail-Safe Device
l
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