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OTC I/O Expansion Modules


Add Programmable Digital PIO Points to a DH1 Gateway



  • 8 programmable discrete channels
  • Designed for use w/ DH1 Wireless Gateway
  • Supports any mix of inputs and outputs
  • Normally open/close, counts, pulsed modes
  • 10 ms to 2000 ms debounce filter
  • 1 Amp sink current for open-drain outputs
  • RS485 serial / multi-droppable
  • -40 °C to 80 °C
  • Class I, Division 2 (Zone 2)

8 Programmable Digital Channels

The OleumTech® Digital I/O Module is designed for easily adding discrete inputs and outputs to the DH1 Base Unit Wireless Gateway. Each channel can be independently software-configured as input, counter, output, or pulsed output. This Module supports any mix of inputs and outputs.

Low-Power, Small Footprint

The Digital I/O Module is certified for use in Class I, Division 2 (Zone 2) hazardous locations and accepts 9-24 Vdc external power. Its compact, small footprint form factor easily fits inside a NEMA enclosure. This Module is equipped with two RS485 Serial ports (RJ-45) for allowing multiple I/O Modules to be daisy-chained to the DH1.


Over Voltage Rating∙ Transient Voltage Suppressor on Each Port
Safety∙ Class I, Division 2, Groups A, B, C, D T4; Ex nA IIC T4
∙ Class I, Zone 2 AEx nA IIC T4 / 9-30 Vdc, Ta = -40 to 176 °F (-40 °C to +80 °C)
∙ ATEX: Sira 14ATEX4143X; Ex nA IIC T4 Gc
∙ IECEx: SIR 13.0055X; Ex nA IIC T4 Gc / 9-30 Vdc, Ta = -40 to 176 °F (-40 °C to +80 °C)
Device Functionality∙ Digital Input/Output Expansion Module for DH1 Wireless Gateway
I/O Interfaces∙ 8x Programmable Channels for Digital Inputs and Outputs
∙ Dry Contact - Internal 20 K Pull-Up Resistor on Each Port
∙ DC Voltage Range: 3 to 24 Vdc (Max); ViL = 1.0 V, ViH = 2.4 V
∙ Current: 1 mA < (3 or 5 V), 2.7 mA (12V), 7.2 mA (24 V)
∙ Debounce: Software Configurable 10 to 2000 ms
Outputs∙ Open-Drain with 1 A Sink Current
Interface∙ Terminal Block for I/O & External Power Input
∙ RS485 (RJ-45 2-Wire), Modbus / RTU Protocol
Multi-Dropped Units∙ 247 (Max)
Self-Diagnostics∙ Contains Comprehensive Self-Checking Software and Hardware for Continuous Monitoring of Operation
Dimensions∙ 3.8" (W) x 3" (H) x 1.4" (D) / 96.5 mm (W) x 76.2 mm (H) x 35.6 mm (D)
Package Dimensions ∙ 8" (W) x 6" (H) x 2.5" (D) / 203 mm (W) x 152 mm (H) x 63 mm (D)
Weight∙ Net: 0.75 lbs / 0.3 kg; Packaging: 1 lbs / 0.4 kg
Mounting∙ DIN Rail Mountable with Height Adjustability
DC Power Input∙ 9-24 Vdc
Power Consumption∙ 360 mW @ 12 V (Max) (All LEDs On); 60 mW @ 12 V (Max) (All LEDs Off)
LED Indicators∙ 8 LEDs Indicating On / Off State of Open-Drain Outputs or Low / High State of Input Signals
Wiring∙ 18- 24 AWG
Operating Conditions∙ Temperature: Class I, Div 2: -40 °F to 176 °F (-40 °C to 80 °C)
ATEX/IECEx: -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 Number∙ WM3000-003
Connects To∙ DH1 Base Unit Wireless Gateway and Expansion Modules
Configuration Cable∙ SX1000-CC2, 20-ft All-in-One Configuration Cable