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OTC Gateways


Ethernet & Serial Interface



  • Wirelessly gather/distribute sensor data
  • Map I/O anywhere within the network
  • Modbus master/slave functionality
  • Ethernet connectivity facilitates IoT and IIot implementation
  • 2x Configurable Serial ports (RS232/RS485)
  • Data logging capabilities / web server
  • Class I, Division 2 (Zone 2)
  • -40 °C to 80 °C
  • 900 MHz / 2.4 GHz / 868 MHz
  • Secure AES encryption
  • Optional local display available
  • Advanced peer-to-peer (P2P) communication functionality

Primary Data Collection Point

The OleumTech® “DH3” Wireless Gateway plays an integral role in the OTC Sensor and I/O Network by being able to wirelessly collect critical process data from OTC nodes including Wireless Transmitters, I/O Modules, and other Gateways. The data is stored in its 1920-point Modbus register holding table.

Data Logging Capabilities

The DH3 offers both event-based data logging and time-based trending/logging capabilities. The data can be stored onto its internal RAM (volatile) or onto an optional industrial-grade Micro SD card (non-volatile). Trend graphs are accessible via the DH3’s web server.

Peer-to-Peer Advanced Networking

In the OTC Sensor Network, multiple Wireless Gateways can be placed into the same network to form a much larger sensor network. All Gateways can have their own set of end nodes and they have the ability to communicate with other Gateways in the network. With this powerful advantage, you can setup sophisticated I/O distribution systems and migrate data with extreme flexibility, scalability, and ease.

Ethernet + Serial + Local Display Option

Equipped with an Ethernet and two configurable Serial ports, the DH3 can interface third-party Modbus devices as a Master and/or Slave for delivering data to the cloud. OleumTech offers Serial I/O Expansion Modules for use with the DH3 for added functionality. An optional touchscreen LCD display is available to instantly view process data and access device settings. The local display requires no user configuration.


∙ ISM Band, Spread Spectrum
Type: 900 MHz / 915 MHz∙ 900 MHz: FHSS (Frequency Hopping), FSK, AES Encryption 256-bit (900 MHz), 128-bit (915 MHz)
2.4 GHz / 868 MHz∙ 2.4 GHz: DSSS (Direct-Sequence), AES Encryption 128-bit
∙ 868 MHz: LBT (Listen Before Talk), AFA (Adaptive Frequency Agility), AES Encryption 128-bit
Bit Rate∙ 900 MHz: 9600 bps / 115.2 kbps; 2.4 GHz: 250 kbps; 868 MHz: 80 kpbs
Output Power (Max)∙ 900 MHz: 1000 mW; 2.4 GHz: 63 mW; 868 MHz: 25mW
Receiving Sensitivity∙ 900 MHz: -110 dBm @ 9600 bps, -100 dBm @ 115.2 kbps
∙ 2.4 GHz: -100 dBm @ 250 kbps / 868 MHz: -101 dBm @ 80 kbps
RF Range∙ 900 MHz: Up to 40 Miles / 64 km with Clear Line of Sight (Gateway-to-Gateway)
∙ 2.4 GHz: Up to 4.3 Miles / 7 km with Clear Line of Sight
∙ 868 MHz: Up to 5.2 Miles / 8.4 km with Clear Line of Sight
Device Functionality∙ Wireless Gateway with Ethernet/Serial Connectivity and Data Logging Capabilities
Embedded Controller∙ 32-Bit Power ARM Cortex - A9core Microprocessor, Up to 800 MHz CPU Speed
Memory∙ Flash Memory: 4 GB / SD RAM Memory: 512 MB
Ethernet 10/100/1000BASE-T∙ Modbus TCP/IP Master/Slave, DHCP Client/Static IP (Device Designed to Work Behind Firewall)
∙ Supports Local/Remote Device Configuration and F/W Upgrade Using BreeZ® 5.0 or Higher
∙ Supports Auto-MDIX/Auto-Crossover for ad-hoc networking (PC directly to DH3)
Serial Interfaces∙ 2x RTU Ports (RS232/RS485 Software Configurable)
∙ Modbus Master/Slave, LevelMaster ASCII Slave, ROC-Link Master (Supports Opcodes 17 and 10)
ROC: Read up to 10 User Configurable (TLP) Points, INT16 (signed or unsigned) or FL(OAT)
2x USB 2.0 Host Ports∙ Supports Firmware Upgrade (USB Flash Drive Required)
1x Mini-USB (OTG)∙ Supports Local Device Configuration and F/W Upgrad Using BreeZ® 5.0 or Higher
Micro SD Card Slot∙ Only Use Industrial-Grade Micro SD Cards: Part # SX1000-SD2 (-40 °C to 70 °C)
Device Diagnostics∙ Health Tag: Supply Voltage
DH3 Dimensions∙ 4.6" (W) x 3.0" (H) x 2.0" (D) / 117 mm (W) x 76 mm (H) x 50 mm (D)
Package Dimensions∙ 8" (W) x 6" (H) x 2.5" (D) / 203 mm (W) x 152 mm (H) x 63 mm (D)
Package Weight∙ 1.3 lbs / 570 g
Mounting∙ DIN Rail Clip (Spring-Loaded)
DC Power Input∙ 9-30 Vdc
Average Power Input∙ Local Display Off: 3 Watt; Local Display On: 5 Watt
Power Consumption @12 Vdc
∙ LCD Unplugged: Idle 172mA (typ), Transmission 401mA @1 Watt
∙ LCD Plugged In, but O: Idle 181mA (typ), Transmission 415mA @ 1 Watt
∙ LCD Plugged In, and On: Idle 330mA (typ), Transmission 532mA @ 1 Watt
Power Consumption @24 Vdc∙ LCD Unplugged: Idle 113mA (typ), Transmission 228mA @ 1 Watt
∙ LCD Plugged In, but O: Idle 117mA (typ), Transmission 241mA @ 1 Watt
∙ LCD Plugged In, and On: Idle 195mA (typ), Transmission 289mA @ 1 Watt
EMC/EMI∙ FCC Part 15 (USA), IC ICES-003 (Canada), ACMA (Australia)
Safety∙ Class I, Division 2, Groups A, B, C, D T4; Ex nA IIC T4
∙ Class I, Zone 2, AEx nA IIC T4 Gc / 9-30 Vdc
∙ ATEX: ITS15ATEX48231X Ex nA IIC T4 Gc
∙ IECEx: ETL15.0039X; Ex nA nC IIC T4 Gc / 9-30 Vdc
DATA LOGGING Records Data to Internal RAM, MicroSD Card Option for Data Persistence
Trending (RAM/Micro SD)∙ 800,000 Pts Max Regardless of Memory Capacity; Supports Multiple Trends; Exportable to .CSV
Event Logging (RAM/Micro SD)∙ 100,000 Pts Max Regardless of Memory Capacity
∙ Event Types: Rising or Falling Edge Event Control: Deadband or On-Delay; Exportable to .CSV
System Logging (RAM/Micro SD)∙ 100,000 Pts Max Regardless of Memory Capacity, Viewable on Web Server or Local Display
Features∙ View Modbus Data, Trends, Event and System Logs, Device/Network Settings, and More
Security/Privacy∙ Role-based Authentication (Admin/User/Guest), HTTPS
Version/PC Platform∙ BreeZ® Version 5.0 or Higher; PC with Windows® Vista or Higher
Connectivity∙ Configurable via Mini-USB Port or Ethernet Port
Security/Privacy∙ Role-based Authentication (Admin/User), SSL/TLS v1.2 (AES-256 Encryption)
Operating Conditions∙ Temperature: Class I, Div 2 (Zone 2): -40 °F to 176 °F (-40 °C to 80 °C)
∙ Humidity: 0 to 99 %, Non-Condensing
Warranty∙ 2-Year Parts and Labor
Country of Origin∙ USA
Model Numbers∙ 900 MHz: WG-0900-DH3, 2.4 GHz: WG-2400-DH3
Wirelessly Connects To∙ OTC Wireless Devices (Gateways, Transmitters, I/O Modules)
Micro SD Card∙ Only Use Industrial-Grade Micro SD Cards: Part # SX1000-SD2 (-40 °C to 70 °C)
Local Display∙ 5.7" Local HMI Display WX-1000-LCD
Configuration Cable∙ WX-1001-CA2, 15-ft USB to Mini-USB Cable or SX1000-CC2, 20-ft All-in-One Configuration Cable