Simplest, Point-to-Point Signal Replication Solution

wio radio module



  • Wireless I/O mirroring system
  • Integrated radio and onboard I/O design
  • Two 4-20 mA inputs/outputs (Radio Module A to B)
  • Two configurable discrete I/O (Bi-directional)
  • Fixed radio pairing and I/O count for ease of use
  • No software or programming required
  • Designed for use in non-hazardous locations
  • -40 °C to 80 °C (-40 °F to 176 °F)
  • 900 MHz/915 MHz/2.4 GHz 
  • Secure AES encryption
  • US Patent #8,811,459 B1

Integrated Radio and I/O Design

The OleumTech® WIO® Radio Kit with Onboard I/O provides instant I/O connectivity and is one of the easiest and most cost-effective solutions for solving a vast number of point-to-point I/O and stranded asset monitoring and control challenges.  The RM4 Kit is comprised of Radio Modules A and B.

The RM4 Wireless I/O Kit provides two unidirectional analog 4-20 mA inputs and outputs (Module A to B only).  It also provides two independently configurable discrete I/O channels that can be set up for the signals to travel in either direction (Module A to B or B to A).  For the sake of simplicity and ease of use, the I/O count in this system is fixed (non-expandable).  The RM4 Kit is designed for use in non-hazardous/ordinary locations.

The original modular WIO System is also available if you require a scalable or customizable I/O solution. 

Reliable, Robust, and Secure

The WIO System leverages reliable, robust, and secure RF technology that replaces traditional hardwire systems by eliminating the need to trench and run conduit and wire.  Thus, the WIO System provides a significant reduction in both setup time and cost to its users.

The RM4 Wireless I/O Kit is available in 900 MHz, 915 MHz, or 2.4 GHz option.  The Radio Kit comes paired from the factory, meaning there is no programming involved, and the over-the-air connection is instant once the system is up and running.  The system offers secure RF communication using AES encryption and fail-safe output protection in case RF traffic is interrupted for any reason.  The communication response time can be set to either 400 ms or 1 second, giving you additional control over update speed and power consumption.


Ambient Temperature-40 °C to 80 °C / -40 °F to 176 °F
Humidity0 to 99 %, Non-condensing
Degree of ProtectionIP20 / Plastic
RF EmissionsFCC Part 15 (USA), IC ICES-003 (Canada), ACMA (Australia)
AS/NZS CISPR 32 (Australia), EN55032 & EN55024 (EU)
ClassificationOrdinary Locations (Non-hazardous)
Analog 4-20 mA CommunicationUni-Directional (Radio A to B Only)
Digital/Discrete CommunicationBi-Directional (Configurable Using DIP Switches)
DIO Mismatch Indication - Right LEDGreen = OK / Red = Mismatch
DIN Rail Mounting Compatibility35 mm Standard DIN Rail (Direct Mount)
Built-In Mounting HardwareSpring-Loaded Clip-On System
Wire GaugeSolid / Stranded (AWG) 28-12 Gauge
Wire Rating (Recommended)300 V RMS, 80 °C and 300 V, 105 °C
Supply Voltage Range9 - 30 Vdc (±5 %)
Reverse Polarity ProtectionYes
Power Consumption (Maximum)Radio A: 230 mA @12 V, 120 mA @24 V
Radio B: 260 mA @12 V, 120 mA @24 V
Packaging Dimensions (WxHxD) 4.8 x 5.1 x 2.8-in / 123 x 129 x 72 mm
Net Dimensions0.7 x 3.9 x 4.5-in / 17.5 x 99 x 114 mm
Packaging WeightSingle: 0.5 lbs / 227 g; Double: 0.8 lbs / 363 g
Net Weight (Single Radio)0.3 lbs / 136 g
Warranty2-Year Limited
Communication TypePoint-to-Point Wireless I/O Communication System
Radio Frequency (RF)902-928 MHz | 915-928 MHz | 2.4 GHz
RF Security128-bit AES Encryption
Antenna Connector TypeSMA (Female Connector)
Default Transmission Speed / Response Time1 Second
Turbo Transmission Speed / Response Time400 ms
Line of Sight Maximum RF Range900 MHz: 40 Miles (64.4 Km) /
2.4 GHz: 4.3 Miles (7 Km)
RF Transmit Power900 MHz: 140 mW/1 W (22 or 30 dBm - DIP Switch Selectable)
915 MHz: 140 mW/1 W (22 or 30 dBm - DIP Switch Selectable)
2.4 GHz: 63 mW (18 dBm )
2.4 GHz Low Power: 10 mW (10 dBm )
Receiver Sensitivity900 MHz: -101 dBm / 2.4 GHz: -100 dBm
Spread Spectrum900 MHz: FHSS / 2.4 GHz DSSS
RF Link Indication - Left LEDGreen = OK / Solid Yellow = Failed
RF Timeout Trigger10 Seconds
RF Response TimeFlashing Normal (1 sec) / Flashing Fast (250ms)
RF Signal QualityFlashing Green = Strong / Flashing Yellow = Weak
2x Analog Inputs4 mA to 20 mA (16-bit Resolution)
Accuracy< 0.2 % of Full Scale
Internal Loop Power+13.5 Vdc
AI Input Impedance (loop)250 Ohm
2x Analog Outputs4 mA to 20 mA (16-bit Resolution)
AO Terminal Voltage Range10 Vdc Min. / 31.5 Vdc Max.
RF Fail-Safe Output ModesLast Known Value (Def.), <4 mA, >20 mA (DIP)
IO Channel Count2x Available on Each Radio Module
Signal DirectionAny Direction, Any Combination (If A = In; B = Out)
Signal Direction Controlled via DIP Switches
Input Voltage Range3-30 VDC
Input Voltage ThresholdSignal ("H"): > 2.3 Vdc (TBD)
0 Signal ("L"): < 1.1 Vdc
Output Rating1 A Sink Current for
Open-Drain Outputs / NPN
RF Fail-Safe Output ModesOn or Off (DIP Switch Controlled)
900 MHz SystemBR-0900-RM4
915 MHz SystemBR-0915-RM4
2.4 GHz SystemBR-2400-RM4