Murata Wireless

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HNIO-241AR

2.4 GHz I/O Radio

Click here if you need additional technical information,
to inquire about samples or to discuss your custom needs.


• Send/receive 4-20 mA and control relays
• Multipoint, bidirectional operation
• Two analog and two relay channels
• Fully configurable through DIP switches
• FHSS technology at 460.8 kb/s data rate
• Class I Div 2 certified
• 2.4 GHz operation
• Operates over input voltage range of
+9 to +30 Vdc making it suitable for
battery and solar power sources
Click here if you need additional technical information,
to inquire about samples or to discuss your custom needs.


download data sheet Rev Date 05/14/08

  • Features
  • AppNotes
  • Buy Now
HNIO-241A series modems are used to transmit 4-20 mA analog signals, remotely control industrial relays and remotely monitor digital inputs such as switch and contact closures using highly robust 2.4 GHz FHSS radio technology. An HNIO network consists of a base station and one to four remotes. Each HNIO-241A series modem has two 4-20 mA inputs, two 4-20 mA outputs, two digital inputs and two relay outputs. Each 4-20 mA input in the base station can be configured to control a specific 4-20 mA output in a specific remote. Each 4-20 mA output in the base station can be controlled by one 4-20 mA input in one remote. Likewise, each digital input in the base station can be configured to control a specific relay in a specific remote, and each relay output in the base station can be controlled by one digital input in one remote. A fully implemented network provides two bidirectional 4-20 mA channels and two bidirectional relay control channels between the base station and its remotes. HNIO-241A series modems are Class 1 Div 2 certified. HNIO-241A wireless networks provide a means to quickly and economically send 4-20 mA signals, remotely control industrial relays and remotely monitor digital inputs in a wide variety of commercial and industrial applications.

Application Notes                                                                                                 see All Product Application Notes
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White Papers
    Wireless Communications for Industrial Applications
    This paper examines the unique requirements and challenges of wireless communications in an industrial setting and provides an overview of RFM wireless products designed specifically for these applications. The information presented serves as a guide for systems integrators and end users responsible for factory floor automation, industrial/PLC control, SCADA, telemetry and related data communications applications. (~ 136 KB, Adobe PDF format.)
    Wireless Transceivers—Make or Buy?
    In choosing to add wireless data capability to a new or existing product, every designer faces a critical decision: whether to engineer the functionality in-house or buy a ready-made module for the application. This paper provides a cost analysis to explore the relative merits of each approach. (~ 160 KB, Adobe PDF format)
Case Studies
    Digital sign control
    A maker of commercial electronic signs chose RFM HopNet wireless serial modems to replace costly cabling runs.
    Heavy duty automation
    Wireless communications from databases to crane scales automate aluminum manufacturing.
    Parking control
    Upgrading a parking facility to monitor space availability without cutting cable trenches.
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