Busable 900 MHz Radio Provides Simple I/O Data Connection

Phoenix Contact

The RAD-ISM-900-EN-BUS busable 900 MHz radio is an addition to Phoenix Contact’s Trusted Wireless Ethernet (TWE) portfolio of industrial wireless products. The radio allows the user to collect I/O without a remotely located PLC or I/O data concentrator. The bused I/O is made accessible to the network using the readily available MODBUS protocol. It can easily be integrated into new or existing PLC, SCADA, or DCS systems. A multiple master function has also been added to the 900 MHz TWE radio family.  This function can create redundancy and wireless failover connections if a master or host radio is not accessible. 

As in the WLAN-BUS and Trusted Wireless Serial radios, the bused I/O is mapped to MODBUS registers, offering easy integration to any MODBUS network. This offers an ideal solution for SCADA systems, as remote I/O can now be collected and reported wirelessly using a single radio device.


  • MOTR-9 technology offers superior radio performance at various data rates
  • Enhanced security with 128/192/256-bit AES encryption
  • Adjustable over-the-air data rates up to 500 kbps
  • Master/slave/repeater-slave operation modes
  • Store-and-forward repeater capability
  • Ethernet, RS-232, RS-422/485 connectivity ideal for new and legacy systems
  • -40 to 65 degrees Celsius operating temperature
  • Busable I/O mapped to remotely accessible MODBUS RTU/TCP registers


Industrial Applications
  • tank level
  • pressure
  • temperature monitoring
  • pump status and control
  • SCADA system expansion