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 FieldPoP™. The ProtoNode is FieldPoP-enabled, meaning all ProtoNodes can be registered to FieldPoP, Sierra Monitor’s device cloud for the IIoT. The FieldPoP 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.

Learn more about FieldServer and FieldPoP capabilities »

The ProtoNode protocol gateway includes one RS-485 port and one Ethernet port, plus a third port that can be used for RS-485, RS-232, RS-422, KNX, or M-BUS and can be programmed in the field or pre-programmed in the factory. For LonWorks functionality, see the ProtoNode LonWorks version.

With the ability to automatically support multiple known controller profiles, the ProtoNode is the instant answer to a manufacturer's needs to meet customer demands. In addition to having access to Sierra Monitor's library to over 140 protocol drivers, the ProtoNode easily supports OEM's custom proprietary host serial or Ethernet protocols. It also has the ability to simultaneously be a protocol gateway and a BACnet MS/TP to BACnet/IP router.

The ProtoNode is BTL (BACnet Testing Laboratory) Certified. This approval assures our customers that we carry only the highest quality of products and performance.


  • FieldPoP Device Cloud support: Register your ProtoNode to the FieldPoP interface for remote access to local applications, configuration, and device management
  • Serial or Ethernet Environment Support – Provide multiple protocol support for any protocol translation as a full-featured, field-programmable OEM protocol gateway solution
  • BACnet Router – Translate between BACnet MS/TP and BACnet/IP protocols
  • BACnet COV – Reduce traffic over a BACnet network by providing fast data communication
  • BACnet BBMD Server – Easily connect  to remote BACnet networks
  • Multi-Client Support – Ensure interoperability between any industrial and/or building automation protocols
  • 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
  • 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 1000 Modbus registers can be included in a configuration file

Specifications for the ProtoNode

Power Requirements

  • Power: 9-30 VDC or 12-24 VAC (RS-422 = 15-30 VDC or 12-24 VAC)
  • Current draw @ 12V
    • FPC-N34 @ 12V = 240 mA
    • FPC-N35 @ 12V = 250 mA
    • FPC-N36 @ 15V = 200 mA
    • FPC-N37 @ 15V = 210 mA
  • M-BUS
    • 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

Enclosure (L x W x H)

  • Dimensions 4.5 x 3.2 x 1.6 in. (11.5 x 8.2 x 4.0 cm)


  • Two years return to factory

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


  • BACnet Testing Labs (BTL) B-ASC Ver. 12
  • TUV approved to UL-916 EN 60950-1, EN 50491-3 and CSA C22-2 standards
  • RoHS Compliant
  • DNP3 Conformance Tested
  • CE  & FCC Approved

Protocol Drivers

Supporting over 140 protocols, the ProtoNode protocol gateway from Sierra Monitor can connect the OEM's device to various control networks using the following protocols:

    No Profiles Found

How to Purchase the ProtoNode

The ProtoNode is currently reserved for OEM customers only. If you would like more information, contact us by: