Bridge the gap.
Every protocol.

Wireless BAS protocol gateways that bridge field-bus devices to IP networks. Modbus, BACnet, and beyond — with native SlateBAS integration.

View Products Supported Protocols
Protocol Support

Field to IP. Seamlessly.

MODBUS

Modbus RTU

RS485 serial • Master/Slave

MODBUS

Modbus TCP

WiFi / Ethernet • Server/Client

BACnet®

BACnet MS/TP

RS485 serial • Token passing

BACnet®

BACnet IP

WiFi / Ethernet • UDP broadcast

LonWorks®

LON

FTT-10 / TP-1250

M-Bus®

M-Bus

Metering • Wired/Wireless

SunSpec

SMA · Fronius · SolarEdge · Auto-discover

* Coming soon

<2ms
Bridge Latency
247
Nodes / Bus
9–24V DC / 24VAC
9–24V DC / 24VAC
OTA
Firmware Updates
SlateBAS
Native Integration
WiFi Bridge

Connect your phone to FieldTunnel's AP and get full access to the building network and internet. No credentials needed.

• Live
SunSpec Solar

Auto-discover SMA, Fronius, SolarEdge inverters. Live monitoring without manual register mapping.

○ Coming Soon
What can you connect?

If it has RS485 — FieldTunnel connects it.

HVAC & Controls
Controllers · Thermostats · VAV boxes · AHUs · FCUs · RTUs · Rooftop units
Power & Energy
kWh meters · Power analyzers · Solar inverters · Battery systems · Submetering · Utility monitoring
Lighting
Dimming controllers · Occupancy sensors · DALI gateways · Scene controllers · Emergency lighting
Industrial
Variable frequency drives · Soft starters · Pump controllers · Fans · Compressors · PLCs
Environmental
CO2 sensors · Temperature · Humidity · Pressure · Air quality · Parking garage monitors · Lab sensors
Generators & UPS
Standby generators · Transfer switches · UPS systems · Power conditioning · Fuel monitoring
If it has RS485 — FieldTunnel connects it.
Modbus RTU · BACnet MS/TP · SunSpec · M-Bus
Product Line

Built for the field.

Available

FieldTunnel Air

W1

Single-bus wireless gateway. WiFi to RS485 bridging for Modbus and BACnet.

  • WiFi 802.11 b/g/n
  • 1× RS485 port
  • Modbus RTU/TCP + BACnet MS/TP/IP
  • 9–24V DC / 24VAC • <2W
  • Web UI + SlateBAS native
Coming Soon

FieldTunnel Air Duo

W2

Dual-bus wireless gateway. Bridge two independent RS485 networks over WiFi.

  • WiFi 802.11 b/g/n
  • 2× RS485 ports
  • Independent bus isolation
  • 9–24V DC / 24VAC
Coming Soon

FieldTunnel Pro

E1

Ethernet + WiFi gateway for permanent installations. Wired reliability with wireless flexibility.

  • 10/100 Ethernet + WiFi
  • 1× RS485 port
  • DIN rail mount
  • 9–24V DC / 24VAC
Coming Soon

FieldTunnel LON

L1

LON to IP bridge. Bring legacy LON networks into modern BAS infrastructure.

  • LON FTT-10 interface
  • WiFi 802.11 b/g/n
  • LON ↔ BACnet translation
  • 9–24V DC / 24VAC
Use Cases

Where FieldTunnel works.

BAS Retrofit

Add IP connectivity to existing RS485 field buses without rewiring. Drop a FieldTunnel on the bus and bridge to your BAS head-end over WiFi.

SlateBAS Integration

FieldTunnel is a native SlateBAS edge device. Auto-discovered, zero-config protocol bridging from field devices to the SlateBAS platform.

VFD & Equipment

Connect variable frequency drives, boilers, chillers, and other Modbus equipment to IP networks without running new cable.

Field Testing

Portable protocol analysis. Connect to any RS485 bus from your laptop or phone over WiFi. Read registers, scan devices, debug communications.