Navien Modbus/BACnet Gateway User manual

Installation & Operation Manual
Modbus/BACnet Gateway Start-up Guide
For Interfacing Navien Products:
To Building Automation Systems and SMC Cloud:
BACnet MS/TP, BACnet/IP and Modbus TCP/IP
APPLICABILITY & EFFECTIVITY
Explains Modbus/BACnet gateway and how to install it.
The instructions are effective for the above as of October 1, 2019.

22
Quick Start Guide
1. Record the information about the unit. (Section 3.1)
2. Set COM settings for the device that will be connected to gateway. (Section 3.3)
3. Connect the gateway 3 pin RS-485 R1 port to the RS-485 network connected to each of the devices. (Section 4.1)
4. Connect the gateway 3 pin RS-485 R2 port to the field protocol cabling. (Section 4.2)
5. Connect power to gateway’s 3 pin connector. (Section 4.5)
6. Connect a PC to the gateway via Ethernet cable or by the gateway’s Wi-Fi Access Point. (Section 5)
7. Use a web browser to access the gateway Web Configurator page to select the profile of the device attached to the gateway and enter
any necessary device information. Once the device is selected, the gateway automatically builds and loads the appropriate configuration.
(Section 6)

3Contents
Contents
1. CERTIFICATION 5
1.1 BTL Mark – BACnet® Testing Laboratory 5
2. INTRODUCTION 6
2.1 Gateway 6
3. GATEWAY SETUP 7
3.1 Record Identification Data 7
3.2 Point Count Capacity and Registers per Device 7
3.3 Configuring Modbus Device Communications 7
3.3.1 Input COM Settings on Any Device Connected to the
Gateway 7
3.3.2 Set Node-ID for Any Device Attached to the Gateway 7
3.4 Attaching the Antenna 7
4. INTERFACING GATEWAY TO DEVICES 8
4.1 NFB-301C/399C boiler Connections to Gateway 8
4.2 Wiring Field Port to RS-485 Serial Network 8
4.3 Bias Resistors 8
4.4 Termination Resistor 9
4.5 Power-Up Gateway 9
4.5.1 Power Up Using the PCB 9
4.5.2 Power Up Using the Power Supply 9
5. CONNECT THE PC TO THE GATEWAY 10
5.1 Connecting to the Gateway via Ethernet 10
5.1.1 Enable Access Through the Local Browser 10
5.2 Connecting to the Gateway Over Wi-Fi Access Point 11
6. CONFIGURE THE GATEWAY 12
6.1 Accessing the Gateway Web Configurator 12
6.2 Setting Gateway Configuration Parameters 13
6.2.1 Verify Device Communications 13
6.3 BACnet: Setting Node_Offset to Assign Specific Device
Instances 14
6.4 How to Start the Installation Over: Clearing Profiles 14
7. NETWORK SETTINGS 15
7.1 Navigate to the FS-GUI Network Settings 15
7.2 Change the Gateway IP Address 16
7.2.1 Update Wired Network Settings 16
7.2.2 Update Wi-Fi Client Settings 16
7.2.3 Common Settings 17
Appendix A. Troubleshooting 18
Appendix A.1 Lost or Incorrect IP Address 18
Appendix A.2 Viewing Diagnostic Information 18
Appendix A.3 Checking Wiring and Settings 18
Appendix A.4 LED Diagnostics for Communications
Between Gateway and Devices 19
Appendix A.5 Taking a FieldServer Diagnostic Capture 19
Appendix A.5.1 Using the FieldServer Toolbox 19
Appendix A.5.2 Using FS-GUI 20
Appendix A.6 Wi-Fi Signal Strength 21
Appendix B. Additional Information 22
Appendix B.1 Updating Firmware 22
Appendix B.2 BACnet: Setting Network_Number for More
Than One Gateway on the Subnet 22
Appendix B.3 Securing Gateway with Passwords 22
Appendix B.4 Wi-Fi Access Point Network Settings 23
Appendix B.5 Mounting 23
Appendix B.6 Physical Dimension Drawing 24
Appendix C. Vendor Information – Navien 25
Appendix C.1 NFB-C Single Boiler Modbus RTU Mappings
to BACnet/IP and BACnet MS/TP 25
Appendix C.2 NFB-C Main 1 Sub 1 - Sub 31 Modbus RTU
Mappings to BACnet/IP and BACnet MS/TP 26
Appendix D. Reference 35
Appendix D.1 Specifications 35
Appendix D.1.1 Compliance with UL Regulations 35
Appendix E. Limited 2 Year Warranty 36

4List of Figures
Figure 31: Diagnostic LEDs 19
Figure 32: Ethernet Port Location 19
Figure 33: Wi-Fi Signal Strength Listing 21
Figure 34: Web Configurator – Network Number Field 22
Figure 35: FS-GUI Passwords Page 22
Figure 36: Password Recovery Page 22
Figure 37: FS-GUI Wi-Fi AP Network Settings 23
Figure 38: DIN Rail 23
Figure 39: Modbus/BACnet Gateway Part Number
GXXX001932 Dimensions 24
Figure 40: Specifications 35
List of Figures
Figure 1: Gateway Part Numbers 7
Figure 2: Supported Point Count Capacity 7
Figure 3: Registers per Device 7
Figure 4: COM Settings 7
Figure 5: RS-485 Connections from Boiler to the Gateway 8
Figure 6: Connection from Gateway to RS-485 Field Network 8
Figure 7: Bias Resistor DIP Switches 8
Figure 8: Termination Resistor DIP Switch 9
Figure 9: Required Current Draw for the Gateway 9
Figure 10: PCB Power Connections 9
Figure 11: External Power Connections 9
Figure 12: Ethernet Port Location 10
Figure 13: Web App Splash Page 12
Figure 14: Login Window 12
Figure 15: Web App Landing Page 12
Figure 16: Configure Tab 12
Figure 17: Web Configurator Showing no Active Profiles 13
Figure 18: Profile Selection Menu 13
Figure 19: Web Configurator Showing Active Profile
Additions 13
Figure 20: Web Configurator Node Offset Field 14
Figure 21: Active Profiles 14
Figure 22: Web App Landing Page 15
Figure 23: Web Configurator Page – Diagnostics Button 15
Figure 24: FS-GUI Landing Page 15
Figure 25: Generic FS-GUI Navigation Panel – Network
Settings 15
Figure 26: FS-GUI Ethernet Port Network Settings 16
Figure 27: FS-GUI Wi-Fi Client Network Settings 17
Figure 28: FS-GUI Common Network Settings 17
Figure 29: Ethernet Port Location 18
Figure 30: Error Messages Screen 18

5CERTIFICATION
1.1 BTL Mark – BACnet® Testing Laboratory
The BTL Mark on gateway is a symbol that indicates that a product has passed a series of
rigorous tests conducted by an independent laboratory which verifies that the product correctly
implements the BACnet features claimed in the listing. The mark is a symbol of a high-quality
BACnet product.
Go to www.BACnetInternational.net for more information about the BACnet Testing Laboratory.
Click here for the BACnet PIC Statement.
* BACnet is a registered trademark of ASHRAE
1. CERTIFICATION

6INTRODUCTION
2.1 Gateway
The wireless unit is an external, high performance building automation multi-protocol gateway that is preconfigured to automatically
communicate between Navien’s devices (hereafter simply called “device”) connected to the gateway and automatically configures them for
BACnet/IP, BACnet MS/TP and Modbus TCP/IP.
It is not necessary to download any configuration files to support the required applications. The gateway is pre-loaded with tested profiles/
configurations for the supported devices.
Gateway Connectivity Diagram:
2. INTRODUCTION

7GATEWAY SETUP
3.1 Record Identification Data
Each gateway has a unique part number located on the side or
the back of the unit. This number should be recorded, as it may be
required for technical support. The numbers are as follows:
Model Part Number
Modbus/BACnet Gateway GXXX001932
Figure 1: Gateway Part Numbers
●GXXX001932 units have the following 3 ports: RS-485 + Ethernet
+ RS-485
3.2 Point Count Capacity and Registers per
Device
The total number of registers presented the device(s) attached to
the gateway cannot exceed:
Part number Total Registers
GXXX001932 5,000
Figure 2: Supported Point Count Capacity
Devices Registers Per Device
NFB-C Single Boiler 118
NFB-C Main 1 Sub 1 - Sub 31 113 - 1013
Figure 3: Registers per Device
3. GATEWAY SETUP
3.3 Configuring Modbus Device
Communications
3.3.1 Input COM Settings on Any Device Connected
to the Gateway
●Any connected serial device MUST have the same baud rate,
data bits, stop bits, and parity settings as the gateway.
●Figure 4 specifies the device serial port settings required to
communicate with the gateway.
Port Setting Device
Protocol Modbus RTU
Baud Rate 9600
Parity None
Data Bits 8
Stop Bits 1
Figure 4: COM Settings
3.3.2 Set Node-ID for Any Device Attached to the
Gateway
●Set Node-ID for the device attached to gateway. The Node-ID
needs to be uniquely assigned between 1 and 255.
●Document the Node-ID that is assigned. The Node-ID assigned is
used for deriving the Device Instance for BACnet/IP and BACnet
MS/TP (Section 6.3)
Note The Modbus TCP/IP field protocol Node-IDs are
automatically set to be the same value as the Node-ID
of the device.
3.4 Attaching the Antenna
Wi-Fi Antenna:
Screw in the Wi-Fi antenna to the front of the unit as shown in
Figure 39.
Note Using an external antenna is also an option. An external
antenna can be plugged into the SMA connector.
The best antenna for the job depends on the range,
topography and obstacles between the two radios.

8INTERFACING GATEWAY TO DEVICES
4.3 Bias Resistors
R1 Bias Resistor DIP
Switches (2 and 3)
R2 Bias Resistor DIP
Switches (2 and 3)
Figure 7: Bias Resistor DIP Switches
To enable Bias Resistors, move both the BIAS- and BIAS+ dip
switches to the right as shown in Figure 7.
The gateway bias resistors are used to keep the RS-485 bus to a
known state, when there is no transmission on the line (bus is
idling), to help prevent false bits of data from being detected. The
bias resistors typically pull one line high and the other low - far
away from the decision point of the logic.
The bias resistor is 510 ohms which is in line with the BACnet spec.
It should only be enabled at one point on the bus (for example, on
the field port were there are very weak bias resistors of 100k). Since
there are no jumpers, many gateways can be put on the network
without running into the bias resistor limit which is < 500 ohms.
Note ●See www.ni.com/support/serial/resinfo.htm for
additional pictures and notes.
●The R1 and R2 DIP Switches apply settings to the
respective serial port.
●If the gateway is already powered on, DIP switch
settings will not take effect unless the unit is power
cycled.
4.1 NFB-301C/399C boiler Connections to
Gateway
Connect the 3-pin Phoenix connector of the R1 port (gateway) to
the 3-pin terminal block located on the right side of the front panel
(Boilers).
Note ●Make sure that the R1 Switch 4 is set to the OFF
position.
●Use standard grounding principles for RS-485 GND.
1 2
O N
ON
12
+
A
B
G
TX +
RX -
GND
R2
R1
3-Pin
Terminal
Block
3-Pin
Phoenix
Connector
+
-
GND
Boiler
(Front Panel) Gateway R1 Terminal Pin
Assignment
ATX + RS-485 +
BRX - RS-485 -
GGND RS-485 GND
Figure 5: RS-485 Connections from Boiler to the Gateway
4.2 Wiring Field Port to RS-485 Serial
Network
●Connect the RS-485 network wires to the 3-pin RS-485
connector on the R2 port. (Figure 6)
-Use standard grounding principles for RS-485 GND.
●See Section 5 for information on connecting to an Ethernet
network.
BMS
Wiring
Gateway
R2 Terminal
Pin
Assignment
RS-485 + +RS-485 +
RS-485 - -RS-485 -
- G RS-485 GND
Figure 6: Connection from Gateway to RS-485 Field Network
4. INTERFACING GATEWAY TO DEVICES

9INTERFACING GATEWAY TO DEVICES
4.4 Termination Resistor
R1 Termination
Resistor DIP Switch (1)
R2 Termination
Resistor DIP Switch (1)
Figure 8: Termination Resistor DIP Switch
If the gateway is the last device on the serial trunk, then the End-
Of-Line Termination Switch needs to be enabled. To enable the
Termination Resistor, move the TERM dip switch to the right as
shown in Figure 8.
Termination resistor is also used to reduce noise. It pulls the two
lines of an idle bus together. However, the resistor would override
the effect of any bias resistors if connected.
Note ●The R1 and R2 DIP Switches apply settings to the
respective serial port.
●If the gateway is already powered on, DIP switch
settings will not take effect unless the unit is power
cycled.
4.5 Power-Up Gateway
There are two ways to power the gateway. One method is to
use the boiler PCB (printer circuit board). The other is to use the
included power supply in the box.
Check power requirements in the table below:
Power Requirement for Gateway
Power Requirement
for Gateway Current Draw Type
Navien Gateway Family 12 VDC 24 V DC/AC
GXXX001932 (Typical) 250 mA 125 mA
Note These values are‘nominal’and a safety margin
should be added to the power supply of the host
system. A safety margin of 25% is recommended.
Figure 9: Required Current Draw for the Gateway
4.5.1 Power Up Using the PCB
Apply power to the Gateway as shown below in Figure 10.
●The gateway accepts 12-24 VDC or 24 VAC on pins 4 and 5.
●Frame GND should be connected.
NULTISW FLOW SW LP SW OUTDOOR DHWTANK
(+)
(-)
(+)
(-)
SYSTEM
SUPPLY
SYSTEM
RETURN
R W
T/SZONE 1 T/S ZONE 2 T/S ZONE 3
CR W CR W C
R W C
T/SDHW
3.LWCO
2.AC24VL
1.AC24VN
NULTI SW
R W
T/S ZONE 1 T/S ZONE 2 T/S ZONE 3
CR W CR W C
R W C
T/S DHW
3.LWCO
2.AC24VL
1.AC24VN
CNC3
3 -Pin
Connector
+
+L
-N
FRAME
GND
Boiler
Front Panel
PCB
Boiler
(controller)
Gateway Power
Terminal
Pin
Assignment
2. AC24VL +L V+
1. AC24VN -N V-
-FG FRAME GND
Figure 10: PCB Power Connections
4.5.2 Power Up Using the Power Supply
Apply power to the gateway power terminal pins +L and -N as
shown below in Figure 11.
Power to
Gateway
Gateway
Pin Label
Pin
Assignment
SMC Power
Supply
Wires
Power In
(+) +L V+ White/
Black
Power In
(-) -N V- Black
Frame
Ground FG FRAME
GND NA
Figure 11: External Power Connections

10 CONNECT THE PC TO THE GATEWAY
There are two ways to connect the PC to the gateway, either by
Ethernet cable (Section 5.1) or Wi-Fi Access Point (Section 5.2).
5.1 Connecting to the Gateway via
Ethernet
First, connect a Cat-5 Ethernet cable (straight through or cross-
over) between the local PC and Gateway.
Ethernet Port
Figure 12: Ethernet Port Location
5.1.1 Enable Access Through the Local Browser
There are two methods to enable access to the Gateway in the
local browser, either by changing the subnet of the connected
PC (Section 5.1.1.1) or using the FieldServer Toolbox to change
the IP Address of the gateway (Section 5.1.1.2).
Note Only perform one method or the other.
5.1.1.1 Changing the Subnet of the Connected PC
The default IP Address for the gateway is 192.168.1.24, Subnet
Mask is 255.255.255.0. If the PC and gateway are on different IP
networks, assign a static IP Address to the PC on the 192.168.1.xxx
network.
For Windows 10:
1. Find the search field in the local computer’s taskbar (usually to
the right of the windows icon ( ) and type in “Control Panel”.
2. Click “Control Panel”, click “Network and Internet” and then
click “Network and Sharing Center”.
3. Click “Change adapter settings”on the left side of the window.
4. Right-click on “Local Area Connection”and select “Properties”
from the dropdown menu.
5. Highlight and then click the
Properties button.
6. Select and enter a static IP Address on the same subnet. For
example:
7. Click the Okay button to close the Internet Protocol window
and the Close button to close the Ethernet Properties window.
5. CONNECT THE PC TO THE GATEWAY