Outboud Communication; Figure 8 - Outbound Communication - Prolon NC2000 Hardware Manual

Outboud Communication

The NC2000 only has a single outbound communication port, the RS485 OUT port. This port is intended
to be wired to the actual network of ProLon controllers communicating in Modbus RTU over RS485
(rooftop controllers, zone controllers, thermostats, etc...). On this port, the NC2000 acts as a network
Master, initiating communication to the controllers, polling them and distributing information.
This port will NOT respond to incoming messages from the ProLon Focus software or other devices,
therefore any attempt to connect to this port with your computer or RS485 converter is futile. Instead,
use the RS485 IN port (on page 11) for communication with a PC or other network master device.
The RS485 OUT port is actually a group of four different connectors, all wired in parallel. Any connector
in the group can be used for outbound communication. The purpose of having these four connectors in
parallel is just to simplify daisy-chaining.
Two of the connectors in the group are RJ45 jacks that are internally wired to correspond to the Modbus
RTU specifications.
The remaining two connectors are simple screw-type terminal blocks with three terminals each for the
A (+), B (-) and GND. (See Figure 7)
Typical wiring setup is to daisy-chain this NC2000 outbound port to ProLon master controllers (rooftop
controller, heatpump controller, etc...) on their respective inbound ports (INT ports). Bias and terminating
resistors should be enabled as required. The master controllers are then wired from their respective
outbound port (NET port) to their respective slave controllers (Zone controllers, thermostats, etc...).
See the ProLon Network Guide for more information on network topology and wiring.
RS485 OUT Port

Figure 8 - Outbound Communication

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REV. 6.1.6 / PL-HRDW-NC2000-C/F-EN