Honeywell NetAXS NX4S1 - RS-485 Connections with Multidrop Panels at Both Ends of the Cable

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NetAXS™ NX4S1 Installation
Installation
RS-485 Communications
The NetAXS™ panel can reside on an existing RS-485 drop line hosted by either a
NetAXS™ panel configured as a Gateway, or N-485-PCI-2, PCI-3, or N-485-HUB-2
(see Figure 10 on page 18, Figure 11 on page 19, and Figure 23 on page 33). The
interface allows the wiring of a Multidrop communication network of up to 4,000 feet
(1200 m) in length. Only one host converter device per dropline is supported.
Note: On a Multidrop line, the Gateway panel and the PCI unit can have either
end-point or interior positions. See Figure 18 on page 28 and Figure 19 on page 29 for
illustrations.
DIP switch position 6 on the NetAXS™ panel selects whether the panel is a Gateway
or Multidrop panel. The switch in the OFF position configures the panel as a
Multidrop panel; ON configures a Gateway. The panel must be power cycled for a
new switch setting to be recognized. DIP switch positions 1-5 are used to select the
panel’s address on the network. Refer to Table 3 for DIP switch setting information.
Connectors J36 and J37 are provided for supplying biasing and end-of-line
termination for the RS-485 network. The board ships with all jumpers open. For a
Multidrop RS-485 line, you must close both J36 and J37 (terminated and biased) at the
two end-point panels. At all other panels, leave J36 and J37 open. Both jumpers on a
given panel must set the same. Note that biasing and termination on both ends are
present. Use the jumpers on both ends of the RS-485 network.
Note: If an RS-485 network has a NetAXS™ Gateway panel, no N1000-II, N1000-III,
or N1000-IV are allowed on the same network. If they are added to a network with a
NetAXS™ Gateway panel, they will not be able to communicate with the host
computer.
Figure 10: RS-485 Configuration via N-485-PCI-2 or PCI-3
NetAXS
Panel
NS2+
Panel
Reader 1
Reader 4
Reader 2
Reader 2
Reader 1
Reader 1
COM1
N1000 III
N1000 IV
RS-485 Multidrop Line
N-485-PCI-2/3
A combination of N1000 III, N1000 IV, NS2+ and NewAXS panels,
supporting a total of 31 panels per multi-drop line
Terminal