Semi-custom design and development project to develop embedded gateway for OEM


The ProtoNode is an external, high-performance, low-cost building automation and industrial control IIoT gateway for original equipment manufacturers (OEMs) that provides manufacturers connectivity to the cloud and instant multi-protocol deployment of field protocols, enabling new or legacy devices to easily interface with other protocols.

OEMs can enjoy the benefits of the cloud connectivity through the SMC Device Cloud. The ProtoNode is SMC Cloud-enabled, meaning all ProtoNodes can be registered to the SMC Device Cloud, Sierra Monitor’s device cloud for the IIoT. The SMC Cloud web interface lets users remotely access, in a secure fashion, the FS-GUI and custom web applications that are available locally on the ProtoNode. These applications offer functionality for configuration, monitoring, logging, security, diagnostics, and updates.

This product is protected by FieldSafe.

FieldServer ProtoNode
1. SMC Device Cloud support

Register your ProtoNode to the SMC Cloud interface for remote access to local applications, configuration, and device management

2. Serial or Ethernet Environment Support

Provide multiple protocol support for any protocol translation as a full-featured, field-programmable OEM protocol gateway solution

3. BACnet Protocol Experience

As a long-time supporter of the BACnet protocol, trust Sierra Monitor to deliver a proven BACnet stack.  Use the ProtoNode to translate between BACnet MS/TP and BACnet/IP protocols, reduce traffic over a BACnet network by providing fast data communication, and easily connect to remote BACnet networks

4. Multi-Client Support

Ensure interoperability between any industrial and/or building automation protocols with one or more of the 140+ protocols supported by Sierra Monitor

5. Advanced Auto-Discovery

Automatically discover known devices on the network and be configured to provide the protocol translation necessary

  • Easily support one or multiple of the same or different devices without having to build any specific configuration files
  • Automatically build the configuration file of known devices and download the file
6. Configuration Auto-Selector

Via DIP switches. Enable manufacturers to pre-load multiple predefined configurations

  • Store multiple predefined configuration files
  • Select the active configuration file with DIP switches on the fly
  • Utilizing the FS-GUI (Graphical User Interface), a different configuration file can be downloaded
  • Up to a maximum of 1,000 Modbus registers can be included in a configuration file
FieldServer ProtoNode
Model Numbers

FPC-N54 - ProtoNode with RS-485 (replaces N34)
FPC-N35 - ProtoNode with LonWorks 
FPC-N36 - ProtoNode with RS-232
FPC-N37 - ProtoNode with KNX

Power Requirements

Power: 9-30 VDC or 24 VAC

RS-422: 15-30 VDC or 12-24 VAC

Current draw @ 12V:

  • FPC-N54 @ 12V = 240 mA
  • FPC-N35 @ 12V = 250 mA
  • FPC-N36 @ 15V = 200 mA
  • FPC-N37 @ 15V = 210 mA


  • Slave: 550 mA @ 12V
  • Master (1 Slave): 580 mA @ 12V
  • Master (64 Slave): 980 mA @ 12V

Operating Temperature: -40º to 167ºF (-40º to 75ºC)
Relative Humidity: 5-90% RH, non-condensing


N3x (classic) form factor:

  • Dimensions: 4.5 x 3.2 x 1.6 in. (11.5 x 8.2 x 4.0 cm)
  • Weight: 0.4 lbs (0.2kg)

N54 (new) form factor:

  • Dimensions: 4.0 x 1.1 x 2.7 in. (10.2 x 2.8 x 6.8 cm)
  • Weight: 0.4 lbs (0.2kg)

Serial RS-485:

  • Galvanic isolation
  • Baud: 9600, 19200, 38400, 57600, 76800, 115200


  • 10/100 BaseT
  • MDIX
  • DHCP
BACnet Support

Alarm & Event notification read properties multiples
BACnet COV’s Trend Logging, BBMD and optional BACnet Router support
Support up to 10,000 BACnet Objects
DIP switches are for setting MAC Address, Node-ID, Baud Rate on the RS-485 Field protocol


BTL Certified 
UL 60950-1

CAN/CSA C22-2 
RoHS Compliant
DNP3 Conformance Tested

FCC part 15



Two years return to factory