Otis Instruments OI-9850-X-X-A4-X Wireless Interface

Availability: In stock
Product TypeWireFree Interface
Power TypeWired Powered
Operating Voltage12V to 35V DC or 120V AC
Current Draw800 mA Maximum at 24 VDC
Power Supply3.13A (75W), 85/264V AC to 24V DC (Optional)
RF ConnectionExternal N-Female Radio Frequency (RF) Connector

-Power Electromagnetic Interference (EMI) Filter

-4-20 mA Surge Suppression

-RS-485 and RS-232 Surge Suppression

Display Screen

128x64 Resolution Graphical LCD Screen

Transflective (Sunlight Readable) with LED Backlight

Interface4 Push-Buttons (MENU, ADD, SUB, and RESET/ESC)
Tamb Temperature Range-40°C to +70°C
WireFree (Digital) InputUp to 255 WireFree (Digital) Sensor Inputs
Wired (Analog) Output

Up to 32 Wired 4-20 mA (3-Wire) Analog Sensor Outputs (Optional or Sold Separately)

Fault Terminal

WireFree (Digital) OutputRS-232 Modbus and RS-485 Modbus, Ethernet-to-Website, and Virtual COM Port Over USB
Product CompatibilityAny Otis WireFree Sensor or Transmitter
WireFree Radio Options

-GEN II 900 MHz Radio

-GEN II 2.4 GHz Radio

-GEN I 900 MHz Radio


-52 Networks (GEN II 900 MHz Radio)

-78 Networks (GEN II 2.4 GHz Radio)

-255 Addresses per Network

Enclosure MaterialNEMA 4X Fiberglass Enclosure with Clear Window
Product Dimensions10 in. L x 8 in. W x 6 in. H (Max. Dimensions with Attachments)
Total Weight8.90 lbs.
Product Mounting

4 Mounting Feet, 6 in. W x 12-1/4 in T (Included)

Maximum Mounting Bolt/Screw Size: 5/16 in. (8mm) Diameter

Product Add-On Hardware

01-4200-PCA, 8-Channel 4-20 mA Output Add-On Board

Capacity: 4 Maximum per 01-9850

Hardware Warranty1-Year, Limited
Part Number Formula




The Otis Instruments OI-9850 Interface WireFree Receiver is capable of monitoring all 255 WireFree addresses and converting the signals to a RS-232 or RS-485 Modbus output. Designed to be used in conjunction with an existing PLC, computer or SCADA system currently in place. Other digital outputs include Ethernet-to-Website and USB Virtual COM PORT. If analog output is required, an optional Analog Card is available and provides a 4-20mA output for up to 32 Wireless sensors.


  • 255 Channel WireFree Interface - All Addresses on Configured Network
  • 12 to 35 VDC Operating Voltage with an Optional AC Power Supply
  • Operating Temperature Range of -40°C to +70°C
  • Graphical LCD with LED Backlight
  • 4 Push-Button Interface (ADD, MENU, SUB and RESET/ESC)
  • GEN II 900 MHz or GEN II 2.4 GHz Radio Standard; GEN I 900 MHZ Radio Can Also Be Installed
  • Individually Configurable Low and High Alarm Set-Points per Channel
  • Output Options: Wet Contact DC Fault Terminal; USB Virtual COM Port; RS-232 or RS-485 Modbus; Website for Displaying Readings, Alarms, Faults and Sensor Information; Optional 4-20 mA Output of 8, 16, 24 or 32 Channels
  • NEMA 4X Standard Fiberglass Enclosure with Clear Window
  • Status LEDs for Power and Fault - Multi-Color Status Light; Amber Fault LED for Indicating System Faults
  • 1-Year Limited Hardware Warranty

​Please refer to datasheet for more information