Solutions by Industry

Serial Communications RS232, RS485, RS422

Summary

Electronic communications is all about interlinking circuits (processors or other integrated circuits) to create a symbiotic system. For those individual circuits to swap information, they must share a common standard communication protocol. Many communication protocols have been designed to achieve data exchange.

The most common serial communication protocols are RS232, RS485, RS422, USB, and Ethernet.  But because USB and Ethernet require powerful interfaces with complex protocols, many efficient devices utilized RS232, RS485, and RS422 which is what this note is all about.

Protocol Comparison Chart

RS-232 RS-422 RS-485
Cable Single ended Single ended multi-drop Multi-drop
Number of Devices 1 transmitter
1 receiver
1 transmitter
10 receivers
32 transmitters
32 receivers
Communication Mode Full duplex Full duplex,
Half duplex
Full duplex,
Half duplex
Maximum Distance 50 feet at 19.2 kbps 4000 feet at 100 kbps 4000 feet at 100 kbps
Max Data Rate (50 feet) 1 mbps 10 mbps 10 mbps

Serial Protocols

The RS232, RS485, RS422 serial protocols only relate to the hardware interface, not the software protocols used to make the devices communicate. There are many protocols that exist in the market place so one cannot assume interoperability between different manufacturers of “RS232” ports.

To define Instruments that supports a mixture of industry standard and proprietary serial protocols:

Modbus RTU

This protocol is used in industrial applications and most SCADA PLC’s have drivers for Modbus RTU. The Modbus protocol is well published and every manufacturer can and does determine its own addressing scheme. The manufacturer must supply the addressing scheme, register type, and Modbus commands that is supports.

ASCII protocol

ASCII is popular because it is easier than Modbus to write your own driver in a PLC or a PC. Most every manufacturer’s protocols are not usually compatible.

The Advantages of RS485 and RS422 vs RS232

RS485 and RS422 use differentiation. Two wires are required for each signal.  The figure below shows a single RS485 / RS422 signal being transmitted. To transmit a logic 1, line B is high and line A is low. To transmit a logic 0, line B is low and line A is high. The advantage of this arrangement is that signals can be transmitted faster and over greater distances than is possible with a single wire.

The main difference between RS422 and RS485 is the types of communications allowed. RS422 allows only one-way (simplex) communications between one driver, and as many as ten receiving devices. To control devices and need no feedback from them, RS-422 multidrop network will work well. RS485 was designed to address the multi-drop limitation of RS422, allowing up to 32 devices to communicate.

RS-232

An RS232 serial bus consists of just two communication wires – one for sending data and another for receiving. As such, serial devices should have two serial pins: the receiver, RX, and the transmitter, TX.  Because the communication data is based upon the voltage on the wires, relative to the ground level, a ground connection must be made between devices that communicate with RS-232.  Here is an RS232 wiring diagram:

A digital 1 voltage is:  -3V to -25V

A digital 0 voltage is:  +3V to +25V

RS232 data is sent serially, each bit is sent one after the next because there is only one data line in each direction. This mode of data transmission also requires that the receiver knows when the actual data bits are arriving so that it can synchronize itself to the incoming data. To achieve this a logic 0 is sent as a synchronization start bit.

RS422

RS422 is designed to be tolerant of noise and forgiving of long cable runs. It achieves this by using a differential current drive output which has high immunity to noise. The noise immunity enables RS485 systems to operate over very long connections, much better than RS232, US, and Ethernet.

Each signal uses two wires to pass the data. The differential voltage on the A and B wires represent the digital value. If B>A the value is 1. If A>B then value is 0.

Input Signal   A    B Output Signal
0   1     0 0
1   0     1 1

RS422A Standard Specifications

  • 1 Driver, up to 10 Receivers

Line Length for Max Data Rate:

  • 40 Feet = 12m 10 Mbits/sec
  • 400 Feet = 122m 1 Mbits/sec
  • 4000 Feet = 1219m 100 kbits/sec

A multi-drop wiring has many desirable advantages, RS422 devices cannot be used to construct a truly multi-point network. A true multi-point network consists of multiple drivers and receivers connected on a single bus, where any node can transmit or receive data.  RS422 networks are often used in a half-duplex mode,

RS485

RS485 is still popular. It is similar to the RS422 upon which it is based. The RS485 port has been used for many years.  RS485 has many advantages over both RS232 and USB when it comes to applications in noisy industrial environments. RS422 devices can be used on an RS485 bus network if they are only used as recipients.

The main difference between RS422 and RS485 is that up to 32 transmitter receiver pairs may be present on the line at one time on RS485. A 120 Ohm resistor must be used to terminate the main line.

RS485A Standard

  • Up to 32 Driver/Receiver Pairs

Line Length Max Data Rate

  • 40 Feet = 12m 10 Mbits/sec
  • 400 Feet = 122m 1 Mbits/sec
  • 4000 Feet = 1219m 100 kbits/sec

When instruments are described as having an RS485 interface this tells you nothing for sure about the signals being transmitted. Usually though only the Transmit Data (TX) and Receive Data (RX) of a normal serial port are converted to RS485 or RS422. The other signals of the serial port are not used. Three arrangements are commonplace: Write only, 4-wire (full duplex) and 2-wire (half duplex).  The  “2-wire” RS-485 connection is shown below.

RS485 half-duplex can use just two wires to communicate with up to 32 device, one at a time.  Each device has the ability to turn off its output drivers, so only the one device that is linking to the host outputs a signal on its TX lines.

Termination Resistors

Termination resistors should be placed on both ends of the twisted pair of wires. The impedance value should be the same value of the characteristic impedance of the twisted pair and should be placed at the far ends of the cable.

For cables that are 2000 feet or less, a termination resistor is not needed at baud rates of 9600bps or less.

If a termination resister is required, a 120? or greater should be used.  No more than 2 termination resistors should be used, one at each end of the RS485 transmission line.

For additional information, contact:

Raveon Technologies Corporation

2320 Cousteau Court

Vista, CA 92081 – USA

Phone: 1-760-444-5995
Fax: 1-760-444-5997
Email: sales@raveon.com

WayWORD Mobile Data Terminal Accessories and Kit

Cable Part Numbers

4C001-30   Power Cable 

    • Cable, 3-pin, female connector, locking, 3 meter length
    • All WayWORDs will come with a power cable, regardless of setup used.

4C806-MF-10  DB9 Data Cable 

    • Data cable black with DB9 female, 10ft.
    • All WayWORDs will come with a DB9 Data Cable.

 4C010-30 External I/O Cable

    • Cable, Assembled, 22 AWG, 12 Conductor, 3m
    • Optional

4C806-Y-10  Y Cable

    • Cable, DB9, Black, M/F, Y-branch, 2 Outputs
    • Systems that require only a small number of external IO pins may utilize the Y-cable to make use of pins normally dedicated for handshaking to be used for their own IO.
    • Optional

Standard MDT Kit

  1. RV-DT-8R
    • MDT, 4×24 LCD, with RFID reader, 10-30V DC
  2. 4C001-30
    • Power Cable, 3-pin, female connector, locking, 3 meter length
  3. 4C806-MF-10
    • DB9 Data cable black with DB9 female, 10ft.
  4. Gift Box
    • 8 15/16 x 8 7/16 x 2 9/16

Other Accessories

  • RV-DT-K2
    • RFID Key FOB
  • RK-PD-1
    • Mount, MDT, 2″x2.5″ Plastic Plate with a 1.0″ Diameter Ball
  • RK-PD-2
    • Mount, Rail Base w/ a 1″ Ball to Attach to Pipe or Handlebar
  • RK-PA-1
    • Mount Arm, 2.28″ Adapter Arm to Connect 2 RAM 1″ Ball Mounts
  • RK-PA-2
    • Adapter Arm, Connects two RAM 1″ Ball Mounts, 6″ length

 

Verifying Radio Communications and Path Signal Strength – PING a Radio

Whenever 2 or more data radios are installed to communicate wirelessly, a vital design point is to establish that the radios are in communication with one another.  Another design point to verify is that the effective radio signal path is sufficiently robust to provide reliable and consistent communications.  Both of these objectives can be realized by becoming familiar with and utilizing the PING feature in any Raveon data radio modem.

The PING of a remote radio is very similar to the PING of a remote IP address.  In each case, the PING command is issued from a local device, the address of the remote device is specified, and if successful, the remote device automatically responds to the PING with the local device displaying the results.  For a PING to be successful, communications in both directions between the local and remote device must take place.  If a PING fails, one or both directions of communications may be assumed to have failed.

To PING a remote Raveon radio modem, several conditions must be met.  First, both devices must be set to operate on the same frequency (ATFR, ATFT, ATFX parameters) the same bandwidth (ATBW parameter) and the same over-the-air baud rate (ATR2 parameter).   Next, both radio modems must be operating in packet mode (ATMT parameter set to 0) and have unique valid addresses (MYID or ATMY, TOID or ATDT, and ATMK parameters).  Additionally, as PING is a Remote Procedure Request (RPR) that includes a message return from the remote radio ensure that TDMA channel access is disabled and the radios are operating in CSMA (Carrier Sense Multiple Access) mode. If you have a GPS enabled radio setting GPS mode 0 will accomplish this.  Finally, both radio modems should have remote access enabled (ATRV parameter set to 0).

To PING a radio modem, enter into command mode on the local modem and issue the following command:

PING XXXX

Where XXXX is the 4 digit address of the remote device (e.g. PING 1002).

Alternatively, you may utilize Raveon’s free-to-download Windows GUI radio configuration utility Radio Manager.  The PING execution is found on the interaction tab.

When the remote radio modem responds to a PING, and the response is received, the local radio modem will display a brief result without indication of error and include the RSSI (Relative Signal Strength Indicator) signal level of the responding (reply) transmission.  To capture the RSSI of the outgoing (request) transmission, you must initiate the PING from the opposing radio, and capture the RSSI from this response.

Here is an example of a successful  PING.  In this case the PING is from modem 1001 querying the remote modem 1002:

Ping 1002

<RPR>

FROM=1002

-90</RPR>

In the successful PING please note that an RSSI value of -90 is returned.  This RSSI information can prove quite valuable. -90 means the receive signal strength was -90dBm.

Whenever installation trouble is encountered, and two radios do not appear to be communicating, it is a good idea to try and execute a PING.  If the PING succeeds, you have verified that the two radios are in fact communicating, and you may consider other aspects of the system as potential failure points.  A PING can also be a valuable tool in aligning directional antennas, which should accurately point towards the opposing target.  While RSSI numbers are relative, generally an RSSI with a value closer to zero than -100dB (i.e. -97, -85db) will be strong enough to support good radio communications.   Note that this is not strictly the case, especially in environments where there is a lot of noise on the frequency in question.  You should always look for a 20dB difference or more between your signal strength and background noise.  For instance, if you background noise level is on average in the vicinity of -115db, you want an RSSI value of at least -95db, with -90, or -85dB being preferred, and providing some buffer against occasional noise spikes.

To acquire an instantaneous reading of the background noise level, ensure no device in the system is transmitting, and then type the command ATRQ.  The background noise level will be displayed.

To strengthen the signal of a transmission you can consider several actions. First, if the output power on the radio modem is not already set at 100% (ATPO parameter), you can increase the output up to 100%.  Second, consider slightly repositioning our antennas, use higher gain antennas, or lower loss or shorter antenna cable.  Third, install a power amplifier.   Raveon can recommend and source several amplifiers.  In any case, ensure none of these remedial actions violate your radio license limits.

 

Author: Larry Topp

The LoRa Protocol

Overview

LoRa is short for “Long Range”.  LoRa modulation scheme is a modulation technique combined with a data encoding technique that gives a broad-band spread-spectrum radio the receive sensitivity of a very narrow-band long range radio. Many people are not looking into what is LoRa, and this document describes LoRa and the advantages the LoRa technology has brought to the communication world.

LoRa techniques give LoRa receivers unprecedented sensitivity levels. LoRa radio modems can receive signals 10 times weaker than most radios.

When a receiver’s sensitivity is increased by 10 times, that is the same communication range improvement as increasing the transmitter power 10 times. But with LoRa you get the great range improvements without any increase in power consumption or transmitter power. And most license-free bands restrict transmit power, so LoRa is the best way to increase the communication range of a wireless data link.

Raveon is one of the many early implementers of the LoRa technology in the USA, and one of the first to get a full-power LoRa device FCC certified. LoRa is a radio modulation technique and protocol that enables a device to have an unprecedented long-range. See our LoRa products at www.iot.raveon.com

Forward Error Correction

FEC is commonly used to increase a receiver’s sensitivity by reducing the bit-error rate of the system. LoRa radios have integrated FEC into the protocol. FEC effectively increases the energy per bit and enables the device to correct for bit errors. By adding extra overhead bits to groups of bits being transmitted, the data throughput gets reduces but the bit-error-rate is lower with weak signals, increasing the sensitivity of the receiver.

Interference Immunity

There are a number of different types of interference all wireless systems must deal with:

  1. Co-channel interference. This is where there is some other transmitter on the exact same frequency that the system is currently utilizing. Many RF systems stop working if the interference is even 10dB weaker than the signal being received. With LoRa, the interference can be as much as 19dB larger than the signal being received and the receiver will still get the signal. This means LoRa systems will keep working reliably as the frequency channels get crowded.
  2. Blocking Rejection. Sometimes a system needs to operate in a location where there is a powerful interfering signal nearby. For example, in the USA the 906-924MHz ISM band that LoRa uses is only 50mHz away from the 800MHz radio bands where powerful narrow-band transmitters emit 100watts, or 2watt cellular 869-894MHz transmitters. Even though LoRa is 10 time more sensitive, it is even 20 X less susceptible to overload from these powerful out of band signals.

Link Margin Comparison

When one compares a LoRa radio system to a traditional UHF or VHF radio modem, we see that the communication range for LoRa is very similar to VHF and UHF, but it achieves this with much less RF power.  The spreadsheet calculations below show the theoretical link margin for LoRa 900MHz compared to VHF and UHF radio systems.

LoRa 200mW LoRa 10mW UHF 2W VHF2W
Operating Frequency (MHz) 915 915 460 160
Transmitter Output Power 23 dBm 10 dBm 33 dBm 33 dBm
Link Distance, km 180 km 40 km 150 km 450 km
Link Distance, miles 111 mi 24 mi 93 mi 279 mi
Transmit Antenna Gain (dBi) 5 5 3 3
Antenna feed loss (both ends) 1 dB 1 dB 1 dB 1 dB
Receive Antenna Gain (dBi) 5 5 3 3
Receiver Sensitivity -128dBm -128dBm -115dBm -115dBm
System Gain  (dB) 151 138 148 148
Link Fade Margin  (dB) 22.2 22.3 22.8 22.4
Link Path Loss  (dB) -136.8 -123.7 -129.2 -129.6
Effective Radiated Power 27 14 35 35

 

The theoretical calculations show that a 200mW LoRa radio will work about as long-range as a 2watt UHF radio.  A 2watt VHF will work a bit longer range but it is using 2 watts. Raveon’s field tests support these theoretical calculations.  We’ve seen VHF and UHF reliably go 50-100 miles line of site, and LoRa can easily go 20-50 miles (at 1/10th the power consumption).

Although, building, forest, and foliage penetration is much better with VHF and UHF radio technology, so 900MHz systems will typically require taller antennas at the base stations and more base stations to get good coverage. This is offset by the cost and power of LoRa radios being so much lower than traditional VHF and UHF systems so building out large area networks with LoRa is a very good approach.

LoRa Modulation

The over-the-air modulation method that LoRa uses is a type of Direct Sequence Spread Spectrum (DSSS) they call Chirp Spread Spectrum (CSS). Each bit is spread by a chipping factor. The number of chips per bit is called the spread factor. Lora also sweeps the modulation across the channel, so that the occupied bandwidth of the transmitted signal matches the choose bandwidth.

The larger the spreading factor, the slower the over-the-air data rate. And as mentioned before, the slower the data rate, the better the receiver sensitivity and the longer the potential communication range. For an example, here is how a spreading factor of 7 affects the bits sent over the air.

CHipPatterns

 

Typically, a LoRa radio uses 125kHz, 250kHz, or 500kHz radio channels.Below is a table showing the over-the-air data rates at the various commons spreading factors LoRa uses on these three channel bandwidths.

LoRa Over the Air (OtA) Baud Rates

The OtA data rates listed below are in kilobits per second. This table assumes the LoRa coding chip rate is set to 1.

Spreading Factor 125kHz B.W. 250 kHz B.W. 500 kHz B.W.
5 15.625 31.25 62.5
6 9.375 18.75 37.5
7 5.46875 10.9375 21.875
8 3.125 6.25 12.5
9 1.757813 3.515625 7.03125
10 0.976563 1.953125 3.90625
11 0.537109 1.074219 2.148438
12 0.292969 0.585938 1.171875

LoRa RF Power Output

In the USA, LoRa systems typically use a combination frequency hopping and direct sequence modes, to keep in compliance with FCC requirements. A hybrid system can use some 125kHz channels and one direct sequence as long as the power limits and dwell limits of the regulations are met.

Hybrid

To keep the transmit power level in compliance with the PSD limits, a 125kHz channel has 41 3kHz windows, so the max power is 41 X 6.3mW = 258mW (24dBm).  If 500kHz channels are used, then the transmit power can be 4X that (1watt) on the 500kHz channel.  To account for modulation peaks and some bandwidth margins, typical LoRa power levels are about ½ the theoretical limit which will ensure regulatory compliance.

Multi-Channel

Raveon’s LoRa base stations utilize LoRa chips that have the ability to receive 8 channels all at the same time. No other long-range wireless technology has this multi-channel receiver capability.

By having the ability to receive 8 channels, 8 wireless nodes can report in at the same time, and as long as they are on different RF channels, the base station can receive them.

LoRaWAN Frequencies

The LoRaWAN protocol specifies that certain frequencies in certain countries shall be supported by every device.  These are listed as:

  • EU 868.1, 868.3, and 868.5 MHz
  • EU 433.175, 433.375 and 433.575 MHz
  • China 779.5, 779.7 and 779.9 MHz.
  • North America  US 902-928MHz.

Be sure to visit the Raveon Blog for more information.

Remote Weather Monitoring

Remote weather monitoring Raveon’s data radio products are well-suited for remote weather monitoring. Raveon VHF and UHF radios are long-range (5-50 miles) and very rugged. Operating from -30C to +60C, they have 5 watts of RF output and consume very little power.

Raveon’s Wireless Telemetry Product Features

  • RS232, RS422, and RS485 serial interfaces
  • Easy to use with built-in smart radio modem. Data In = Data Out.
  • Works with MODBUS, DNP, and most serial SCADA protocols.
  • 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
  • Exceeding all FCC part 22 and 90 requirements

Products for the Oil and Gas Industry

M7 Wireless Modem

M7s Series UHF Wireless Modems

Ideal 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…

M5 Wireless Modem Raveon’s RV-M5 FireLine series of VHF data radio modems are a high-speed FCC refarming compliant data radio designed for telemetry, wireless data, GPS, and remote control applications.  They operate in the 136-174MHz frequency band, with up to 5 watts of RF output.

More Info…

Wireless Utilities Management Solutions

wireless utilities management Raveon’s data radio products are well-suited for wireless process control, wireless SCADA and wireless telemetry applications. With the fastest transmit/receive turn around time in the VHF/UHF radio modem business, your polled telemetry system will operate fast and efficient.

Raveon’s Wireless Telemetry Product Features

  • RS232, RS422, and RS485 serial interfaces
  • Easy to use with built-in smart radio modem. Data In = Data Out.
  • Works with MODBUS, DNP, and most serial SCADA protocols.
  • 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
  • Exceeding all FCC part 22 and 90 requirements
  • Remote “Ping” capability

Products for the Utilities Management Industry

M7 Wireless Modem

M7s Series UHF Wireless Modems

Ideal 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…

M5 Wireless Modem Raveon’s RV-M5 FireLine series of VHF data radio modems are a high-speed FCC refarming compliant data radio designed for telemetry, wireless data, GPS, and remote control applications.  The operate in the 136-174MHz frequency band, with up to 5 watts of RF output.

More Info…

Custom OEM Wireless Data Solutions

Raveon Technologies excels at designing and manufacturing communication products which solve very unique communication needs. From semi-custom products based upon our existing technology, to fully custom designs, Raveon can deliver a wireless solution at an off-the-shelf price. If you need an embedded wireless modem, or a complete custom wireless data product, talk to Raveon about designing and manufacturing your wireless solution.

To help us better understand your needs, include information about the size, power requirements, frequency band, and desired data rate of the product you need. REQUEST A FREE QUOTE

Below are some of the custom wireless products we have designed for OEMs around the world.

Specialized I/O and network interfaces such as Ethernet, USB, RS-485, GPS, IRDA may be added to our standard products. Other non-standard frequency bands are available. Contact us with your requirements, and we will give you a detailed proposal describing just what we can do for you, how much it will cost, and when it can be delivered.

Custom Wireless SolutionsMurs Modem

Wireless Remote Controls

Raveon has designed and produced a number of wireless remote control systems that enable hand-held devices to control other devices from  miles away.  Battery lives of months and ranges measured in miles are all possible when combining advanced Radio and Digital techniques.  Raveon’s wireless technologies span DSP, RF, antennas, and software – making quality radios that simply communicate farther.  Our unique combinations of hardware and software allow us to produce wireless remote controls, that operate in unlicensed frequency bands, which will work over many miles using simple omni-directional antennas.

Raveon can turn-key develop your wireless device; designing, tooling, and producing a complete solution that meets your specifications.

When you need long-distance wireless remote control, think Raveon.

license free datat radio - MURS

OEM Radio And Radio GPS Boards

Raveon offers OEM radio boards that include GPS and titl-sensor options for your custom product design (see datasheet).

For years, Raveon has also designed and manufactured numerous MURS band radio products. MURS is a radio service unique to the USA, that allows 2-watt voice or data communications on unlicensed VHF radio channels.

Our RV-M3 radio module (Pictured below), is an OEM-only transceiver for embedded wireless data. It has exceptional communication range, lower power, and low cost. It is ideal for embedded remote control applications where the communication range is measured in miles instead of feet. We also offer a MURS version of our standard M7 data radio modem, called the RV-M7-VM.

POCSAG transmitter

POCSAG Paging Products

Raveon Technologies has a variety of POCSAG transmitting and receiving technologies. We have developed many OEM and custom products that utilize POCSAG.

VHF amplifier

Custom Product Design

When nothing standard will work, or the cost of your current solution is to high, let Raveon design and produce a wireless product for you.  You will get a product that does exactly what you want it to do, looking like you want it to, and in the perfect size and shape.  And our custom products are often lower-cost than other company’s off-the-shelf products!  Raveon manufactures lower-volume products in the USA and higher-volume in Asia, giving enormous flexibility on scheduling and pricing.

Supervisory Control and Data Acquisition (SCADA) Solutions

Raveon’s Unique Features for SCADA Applications

  • High-speed over the air data rates. 19200bps in 25kHz channel, 9600bps in 12.5kHz.
  • Remote status monitoring including DC voltage, packet error statistics, modem “up time”, and receiver signal strength.
  • RS-232, RS422, RS485 on all M7 radios. RS232 is standard, and RS422 and 485 options are available.
  • Very fast Transmit-to-Receive turn around.  3mS attack time enables very fast polling in your wireless telemetrysystem.
  • Easy to use. Plug-in, Turn-on, and GO.  Transmit data in = Receive data out.
  • Low Cost. Raveon’s M7 series of wireless data modems are the most economical data radio modems on the market.
  • 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.
  • ARQ error correction and retransmission capability.  Totally transparent to the application.
  • 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.  FireLine 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.   With the FireLine, 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.
  • SkyLine compatibility mode for use in older Sonik radio systems.
M7 Wireless Modems

M7s Series Wireless Modems

Ideal 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…

M5 Raveon’s RV-M5 FireLine series of data radio modems are a high-speed FCC refarming compliant data radio designed for telemetry, wireless data, GPS, and remote control applications.

More Info…

Remote Irrigation Control Solutions

Remote irrigation control Raveon is a leader in wireless control for irrigation.  Many of our standard products, such as the FireLine wireless modem (RV-M5) and the low-cost MURS band OEM module (RV-M3) are perfect for remote irrigation control, monitoring, and last-mile links to your irrigation system.

Raveon’s M7 Series of high-speed UHF data radio transceiver increase data throughput in narrow-band wireless systems.  High-speed over the air data (up to 19.2K) and long-range (up to 50 miles with omni antennas)  make it an excellent choice for irrigation control.  Included in each unit, are advanced networking, error correction, and diagnostics.  It may be ordered with an IP65 weatherproof enclosure.  And because it is the only radio modem built using rugged “single-board” construction, it is extremely tough – and cost effective.

With prices starting below $400 the M7 is the most powerful, most economicaldata radio modem available, and is ideal for remote control and pivot irrigation.

Raveon’s Wireless Modem Product Features

  • RS232, RS422, and RS485 serial interfaces
  • Range of 5-50 miles
  • Operates on licensed UHF and VHF radio channels
  • Easy to use with built-in smart data radio modem. Data In = Data Out.
  • Works with MODBUS, DNP, and most serial SCADA protocols.
  • Powerful 5 watts of RF output (programmable down to 1/2 watt)
  • Ultra-fast T-R switching time of 3mS
  • Store-and-forward repeater capability
  • Optional Weatherprrof enclosure

Products for the Irrigation Industry

M7 Wireless Modems

M7s Series Wireless Modems

Ideal for remote control 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, andAVL applications.

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VHF Wireless Modem

M5 VHF Wireless Modem

Raveon’s RV-M5 FireLine series of data radio modems are a high-speed FCC refarming compliant data radio designed for telemetry, wireless data, GPS, and remote control applications.

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weatherproof wireless modem

M7 WX Weatherproof Wireless Modem

The M7 WX is the weatherproof version of Raveon’s M7 wireless modem. It isIdeal for remote control 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.

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Moduleremote

Let Raveon design and manufacture your wireless product for you.

When nothing standard will work, or the cost of your current solution is to high, let Raveon design and produce a wireless product for you.  You will get a product that does exactly what you want it to do, looking like you want it to, and in the perfect size and shape.  And our custom products are often lower-cost than other company’s off-the-shelf products!  Raveon manufactures lower-volume products in the USA and higher-volume in Asia, giving enormous flexibility on scheduling and pricing.

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Asset Tracking Transmitters and Hardware

assets imageRaveon’s new RavTrack series of GPS Tracking transceivers have built-in GPS and are the fastest real-time tracking radios in the industry.

See: www.ravtrack.com for more information on Raveon’s complete Real-Time GPS Tracking system.

 

Products for GPS Tracking of Assets, Vehicles, and Personnel

Asset tracking transmitters

ATLAS PL Personal Locator

The Atlas PL is part of Raveon’s RavTrack GPS tracking technology. With built-in UHF and GPS antennas, rechargeable battery, position sensor, and alert button, the ATLAS PL is ideal for tracking personnel in mission-critical circumstances.

It is compatible with the M7 GX transponder and RavTrack PC AVL software.

For privacy and security, over-the air encryption is standard on every Atlas PL. For network versatility, the Atlas PLincorporates a 16-bit identification code, allowing up to 65,000 to be identified in one system.  For wide-area coverage, all Atlas PLs may be set to store-and-forward messages from other RV-M7 or from other Atlas PLtransponders.

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M7 GX GPS Transponder with Trimble GPS

M7 GX GPS Transponder

For truly turn-key asset tracking system, the -GX option for the M7 radio modem incorporates a built-in Trimble GPS into the radio.  The M7 model M7 GX is the easiest-to use UHF GPS tracking radio made.  Featuring NMEA output compatible with most plotters and hand-held GPS units that have serial NMEA inputs, the unit is able to report its position and status (voltage, temperature, speed, direction…) in less than 50mS. Using its built-in TDMA channel access method, a system built with M7 can track up to 20 units with 1-second updates, 300 units with 15 second updates. or up to 9999 units with updates as fast as every 15 minutes.

M7 WX Weatherproof GPS Transponder

M7 GX WX Weatherproof GPS Transponder

The WX version of Raveon’s GPS transponder is housed in a weatherproof enclosure. For more details, visit the M7 GX WX product information page on Raveon’s GPS Tracking website.

When nothing standard will work, or the cost of your current solution is too high, let Raveon design and produce a wireless product for you.  You will get a product that does exactly what you want it to do, looking like you want it, and in the perfect size and shape.  And, our custom products are often lower-cost than other company’s off-the-shelf products!  Raveon manufactures lower-volume products in the USA and higher-volume in Asia, giving enormous flexibility on scheduling and pricing.

Visit Our Custom Wireless Solutions page for more information.