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Data Radio Modems are Great Tools for SCADA and Telemetry Systems.

Supervisory Control and Data Acquisition (SCADA) system is a type of Industrial Control System (ICS). Use Raveon’s RV wireless data modems for SCADA and Telemetry systems. Use all your own devices, your Controller, your Slave Devices,  on your system.  Wireless Modems extend the range, increase the reliability, and reduce the cost of your SCADA system. Wireless SCADA is great for IIot, smart cities, Machine to Machine. It controls devices and measuring things in Cities, States, Agriculture, Campuses, Golf Courses, factories, and all other places.

The Master Controller is often called the SCADA Master Station. In small SCADA systems, the Master Station is a computer that communicates with controls systems and other equipment.

In large SCADA systems, there can be multiple servers running multiple software applications. Wireless Telemetry systems can cover larger areas and large countries using reliable data radio modems.

Each slave device in a network is assigned a unique unit address from 1 to 247. When the master controller requests data, it sends is the Slave address. The slave device returns the requested information. If the request is invalid, the slave will return a message indicating the request was wrong. Most slaves have an 8-bit unit address, so 1-247 can be queried.

Large systems have and many slave devices which are called remote terminal units (RTUs), and programmable logic circuits (PLCs).

Raveon data radio modems each have a 16 bit ID in them. The system can be setup to broadcast messages to all radios, or it can be setup so only radios output messages with the correct ID or the correct group ID. Because the radios have 16 bit IDs, a SCADA system can utilize the radio’s ID to send and query 1 to 65,000 different slaves.

Wide area wireless SCADA and Telemetry systems communicate and power to your sensors, making your application truly wireless. Many types can be utilized, including 4-20 mA, 1.5V, Modbus, Hart, Digital IO and other analog and digital interfaces.

Raveon’s data radio modems can wirelessly connect your slaves to your controller, and the Tech Series versions of Raveon’s modems also have slave features built into them.

SCADA systems stand out among ICSs as systems that monitor and control assets distributed over large geographical areas, and use specific control equipment such as a Master Terminal Unit (MTU) and Remote Terminal Unit (RTU).


Use Wireless Slave Devices

To save costs and make the system easier to install and move, Raveon provides “Wireless Slave Devices”.  A wireless slave device has general purpose IO connections on it, with a built in radio modem, and secure and reliable communication protocols. Use SCADA commands or MODBUS commands to communicate with Raveon’s wireless slave devices. Raveon’s Tech Series radio modems have a myriad of IO options and frequency band options, to work as wireless slave devices for Remote Terminal Units (RTUs)

Click here to see the RV Tech Series radio modem with GPIO interface or Flexible IO interface.

The Tech Series Remote terminal Unit (RTU) modem:

GPIO Interface Options:   (Configurable)

  • Switched DC Power output
  • Analog Inputs to measure voltage
  • Open Drain Switched output driver
  • Digital Input for data bits or switch status.


There are many industrial SCADA communications protocols: Modbus, DNP3, BACnet, T101, ControlNet, and many more. One of the oldest industrial communications protocols is MODBUS. MODBUS is still widely used in many devices and Programmable Logic Controllers (PLCs) because of its simplicity and its widespread acceptance. Raveon has incorporated MODBUS messaging into its Tech Series Radios with GPIO and FIO interfaces, and into the Remote Zone Node (RZN). MODBUS is a good protocol to learn when you’re getting started with industrial communications.

Remote Zone Nodes

Raveon’s Remote Zone Node (RZN) is a smart Slave Device for use in remote areas and connecting to your network. The RZN is a Remote Terminal Unit (RTU) used to monitor and control a variety of devices and systems. An RTU is similar to a programmable logic circuit (PLC) but has more in-depth functionality. A key component of a the RZN is the ability to send and receive real-time data.

The Remote Zone Node is an ultra-smart RTU

A. Wireless communication links.

B. Use Ethernet, RS485, or Wireless modems to talk to it. All built into it.

C. A RZN can relay MODBUS messages on to other RZNs using RS485 or wireless links.

D. Use a RZN to switch DC or AC power, measure voltage, read switches, or count events.

E. Use the RZN one your private network with secure communications.

F. You can setup the RZN to connection to the Internet for IoT services i remote areas.

Remote Zone Node (RZN)

Raveon’s   RZN has many smart IOs.

  • 8 Switched Power outputs for AC or DC switched power.
  • 4 Digital inputs. TTL for binary inputs.
  • 4 Digital outputs. TTL binary output bits.
  • 2 Analog input. 0-6V, 4-20mA option.
  • 2 Analog inputs, 0-6V.
  • 2 robust Switch sensors. Switch Grounds.
  • 1 DC power out, same as in, switchable.
  • Digital DC voltage output, 5V, or 3.3V.

The RV-N55 RZN has many communication methods

  • Ethernet.
  • RS-485
  • Narrow-band wireless  (long range)
  • ISM band license free wireless (long range)
  • LTE Cellular coming soon.

Timer Operations Actions and Alerts TOAA

TOAA Events are setup with three parameters (Timer, Operation, and Action).You can remotely configure this, or manually set it up, and leave it in the field to take actions and alerts at whatever time and period you would like.

The timer is accurate and can specify precisely at a day, hour, minute, and second to activate. To create a New Network Event with TOAA technology using MODBUS commands see Creating Modbus Master Events.

Remote SCADA Networks

The Remote Zone Nodes can mesh together, to form Remote Zone Networks. The remote network is your own PRIVATE network, and and can cover many square miles using Raveon’s long-range wireless technology. Modern RTUs like the RZN are capable of executing simple programs autonomously without involving the host computers.

RZNs will pass messages onto other RZNs as needed. MODBUS messages will be processed, or passed on to other RZNs connected together with wires, Ethernet, or wireless modems.

Meshing multiple RZN with wires or wireless can control thousands of things.

Raveon’s M8 and M6 radios may be installed inside the RZN device for wireless meshing

One Ethernet interface on the main RZN can communicate with all other RZNs in the Remote Network created with the RZNs.

The RZN can operate AUTONOMOUSLY.  Autonomously operation works without involving the host computers. The smarr CPU in the RZN will monitor what you want, and control outputs the way you want. It and run and control in a remote area even without a Master controller.

Warranty and Great Support

We can help you with every aspect of your project:

    Getting you up and running.
    Customizing our product to suit your application.

Raveon’s Unique Features for SCADA Applications

  • Long Range. Coverage typically covers 10-100 square miles ( 16 to 160 square kilometers).
  • Remote status monitoring including DC voltage, packet error statistics, modem “up time”, and receiver signal strength.
  • RS-232, RS422, RS485, USB, GPIO, and ANALOG. RS232 is standard, and a myriad of other interfaces are available.
  • Very fast Transmit-to-Receive turn around. 3mS attack time enables very fast polling in your wireless telemetry system.
  • Easy to use. Plug-in, Turn-on, and GO. Transmit data in = Receive data out.
  • Usable for Telemetry Communications. All radio modems support serial comm protocols such as MODBUS, DNP3, and many others.
  • Built in protocols. Some Raveon data radios have telemetry protocols built into them, such as MODBUS.
  • Secure Data. All Raveon data radio modems have built in AES encryption.
  • Low Cost. Raveon’s wireless data modems are the most economical data radio modems on the market. And there are no cellular fees on private radio networks.
  • Remote “PING” From any modem, a user may send a “PING” to any other radio modem to find out the link signal strength. This allows quick diagnostics, easy antenna alignment, and reduced site visits.
  • Lowest current draw in industry. Most Raveon wireless modems draw less than 90mA when fully operational, and some are less than 80mA.
  • Wide input voltage with high-efficiency switching voltage regulator.
  • Packetized AND Streaming Data. Integrated Packetized data protocol with error correction and built-in Streaming Real-Time operation. User selectable.
  • Capable of store-and-forward repeating operation.
  • Small size. Extruded aluminum enclosure is small, and very rugged.
  • 16 bit addressing for up to 65,525 different unique device addresses per channel. Radio channels may be shared with no interference between users.
  • Supports group and broadcast transmissions. Network mask allows groups of any size.
  • Easily to configure. Modems are configured using “AT” commands through the modem’s serial port or by using Raveon’s Windows-based Radio Manager configuration program. There is no need for a separate serial link to the modem to configure or manage it.
  • RS-232 serial input and output. Programmable serial baud rates up to 115400 make the FireLine compatible with most every PLC, PC, and HMI device made.
  • Programmable over-the-air data rates. YOU can choose how your system will work. Set the OTA data slower for extended communication range, or set it fast for lowest latency. Your choice.

Other Raveon SCADA and Telemetry Technology

SCADAcomm:  The SCADAcomm software app is a free open source tool for experimenting and using MODBUS messages to communicate with slave devices that utilize MODBUS messages such as Raveon’s GPIO and FIO slaves. See AN230(ModbusMx) for information about MODBUS.

Serial IO.  Raveon modems have many serial IO options. For more information about the pros and conns of various serial communicatoin methods such as RS232, RS484, RS422, USB, and Ethernet see Application Note AN236.

M7s Series Wireless Modems

M7 Wireless Modems for SCADAIdeal for SCADA and Telemetry applications, the M7 series of products features: 1/2-5 watts of RF output in the 450-480MHz (other bands available), range of 5-50 miles, ultra-fast T-R switching time of 3mS, store-and-forward repeater capability, remote “Ping” capability, voltage, temperature, and current monitoring, and RS232/422/485 interfaces available. Perfect for SCADA, remote control, telemetry, mobile-data, and AVL applications.

More Info…

Tech Series Wireless Radios

M7 Wireless Modems for SCADARaveon’s Tech Series M21 radios have Range capabilities of up to 50 miles for GPS tracking, data communications and SCADA. The M21 also has an even faster turn around time then the M7, and an interchangeable front I/O panel. The M21 has a new power connector that is rugged and water sealed.

Built into this product are SCADA and Telemetry commends to control and read the IO pins. A MODBUS option is available so MOSBUS protocol can be used to manage the GPIO interface and IO pins on other interfaces.

More Info…

Tech Series IO connectors:

  1. RS-232 (DB9 Computer UART port)
  2. RS-422 ( Differential IO with Screw Terminals)
  3. RS-485 ( Differential IO with Screw Terminals)
  4. USB ( USB interface with Serial Converter)
  5. GPIO (General Purpose IO, Screw Terminals)
  6. Analog (DB15, Analog and RS232 serial)

Click here: To Learn more about the Advantages of RS-232, RS-485, RS422

Daisy Radio

M7 Wireless Modems for SCADADaisy Chain your network with miniature wireless data links. Raveon’s “Daisy” modem comes as either a cellular modem, or a FCC licensed radio modem on either UHF or VHF bands.Daisy chain your remote devices with this low-cost, low-power, efficient and secure long-range wireless link.

The Daisy modem is Raveon’s most compact design, small enough you could even use this on drones with little to no affect on the drone itself. The Daisy modem is perfect for linking together multiple devices that would otherwise need to be wired together.

Daisy Radio More Info…

Store – And – Forward  Repeaters

Repeaters receive and re-transmit data. They are able to transmit signals over large distances, even with the presence of a physical obstruction. All Raveon data radio modems have Store-And-Forward repeater features.  One repeater can typically cover 20-200 square miles.

Repeaters enable you to send wireless data to very remote areas that cannot be directly communicated to from the Master Controller’s location. Repeaters can help cover any area.

Store-And-Forward Repeater functions in radio modems can be configured as smart repeaters.

Each repeater can be setup to repeat messages to groups of certain RTUs and not repeat messages to others.

A “to-repeat” table is in each modem to specify the IDs of the messages to repeat. The repeater monitors the IDs of the modems connected to the  RTU to determine if message to it should be repeated.

Repeaters can be configured to not repeat duplicate messages, and only repeat a message once. When this feature is used, a system can have multiple repeaters, that don’t fight with each other.

Connect your Device to a Data Radio Modem

This application note:  AN236(SerialComm)  describes how to connect SCADA and telemetry devices to serial interface ports.

RS-232, is common to used with a computer.

RS-422 and RS-485 interfaces are popular for in-field use on SCADA and Telemetry systems.

USB interfaces are common to sue for PCs, server, laptops, and smart phones.

Ethernet interfaces are used to connect master controllers and slaved devices to networks or Cloud servers on the IoT.

All of These Options Are Available

Raveon has all of these options for most products and radio modems.  The Cigorn Gateway router can be used to route messages to and from all  devices and interfaces.


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