Posts Tagged “868”

Perhaps we aren’t aware that we are being immersed in day-to-day life but without knowing it, the world is completely changing in leaps and bounds. Every day I see more and more different types of company projects that are trying to find a solution to radio frequency. We want everything to be automated, we want to measure everything, we want everything to be optimized, we want to control everything and we want to do all of this from a distance, without wires and without travel expenses.

Like all changes throughout history, any profound change has pros and cons. The upside of telemetry is obvious as we make considerable savings in personnel and we are able to control everything in real time. The downside is job loss. Any job where the main function is to go to a place to take a measurement or a something simple has its days numbered.

In today’s post I am going to describe some “finished” devices (i.e. boxed and ready to use). Some of them are well known to some of you, they are devices with the French brand Coronis (distributed in Spain by Matrix) e.g. Wavetherm, Waveflow, Wavelog, Wavesense, Waveport, Wavesense, and Wavetalk. As there are lots of devices I will give you a superficial description of them, just to give you an idea so that you don’t get tired of reading and writing. I will write about the devices one-by-one in more detail later.

All Coronis devices that I have just mentioned are radio devices that work in the 868MHz band (ISM band, this means a free band as you don’t have to pay for a license to use it). Apart from Waveport, all of the devices are “finished” in an IP68 box, this means that they are designed to work out in the open. They have an internal battery that allows them to be autonomous for up to ten years, I will discuss this later. These devices stand out for two things: the radio link distance and very low consumption.

coronis

Wavetherm:

Device for measuring temperatures. There are several options; you can purchase a Wavetherm that uses a Dallas DS1821 probe or the well-known PT100 and PT1000. It’s a programmable device, it can use logger and it’s possible to set a maximum and minimum temperature threshold which will then send an alarm message.

Waveflow:

Telemetry device for energy, water and gas meters. It basically comprises of a pulse reader e.g. every time X litres of water circulates in a water meter, it opens/closes a dry contact. These pulses are “counted” by the Waveflow and it stores the measurements inside. Waveflows with 2 or 4 inputs are available.

Wavelog:

Basically it’s a device for measuring digital inputs or controlling digital outputs. There are up to 4 digital inputs/outputs available.

Wavesense:

Like Wavelog is for digital signals, Wavesense is in charge of analog signals. There are two versions. On one hand you have Wavesense for 0-10v signals and on the other hand Wavesense reads device’s outputs of 4-20mA.

Very good, I see that Coronis has lots of telemetry devices but how do I read them?

With Waveport.

Waveport is device that is available with two communication interfaces. With a USB port or with a RS232 port.  They are basically the same because whoever uses the USB version will actually have a Virtual COM (using a typical FDTI chip) therefore it works the same way.

Wave port is designed to connect itself to an intelligent device, to a communications hub (a PC or PLC etc.) i.e. something where there is a running program that’s responsible for saying to Waveport “go, tell me Wavetherm’s indicated temperature with the MAC address XXXXXXX”

What is the range of Coronis communication devices?

Well it depends on the type of device. Waveport and Wavetalk devices are available in 25mW and 500mW. The rest of the devices are only available in 25mW. In general terms 25mW Coronis devices can reach up to 1Km as the crow flies and the 500mW devices can reach up to 4Km.

And what happens if the distance is greater than mentioned above?

Well you can use Coronis relays, Wavetalk devices. When communicating with Coronis devices, you can insert up to 3 relays i.e. up to 3 Wavetalk devices. Therefore, when using 500mW devices you could have a radio link range of up to 16Km.

So is it always better to use 500mW devices than 25mW devices or not? 

Not really. They are more expensive, they consume more and unlike 25mW devices they don’t use FHSS (frecuency hopping) and therefore they are less immune to interference. You should use 500mW devices when you need to use them for greater distances.

Above you said that the battery lasts for up to ten years, is that true?

Yes, but it depends a lot on how you use the device and what you want it to do. It’s complicated so if you ever want to know how long your battery would last in a given scenario, tell me the details. To give you an idea, the battery from a Waveflow device that reads meters will last for around ten years if it takes one reading per day.

One reading a day? That’s not much…

Coronis devices (with batteries) are NOT designed for intensive use, at least not using the battery supply. They are devices that are designed to take a few readings over time so that they can spend most of the time in sleep mode. If for example you are looking for a device that does a meter’s telemetry ever 10 seconds, a Waveflow is not for you. You could use it, but it would flatten the battery within a few weeks.

Are the integrated batteries only in the IP68 version? I would like to integrate them like an OEM module in my own circuit so that I could use them with bigger batteries or even use a 220v adapter so that I wouldn’t have to depend on batteries. 

Coronis also have the OEM version of these devices. The limitation is the MOQ (Minimum Order Quantity). This means that if you have a project for 100 or more devices, you could purchase OEM modules. If it’s a small project for a couple of units you can’t get the OEM modules.

Well that’s enough for today. This is a very brief overview of these devices. We haven’t gone into any detail as these devices offer a lot more than what I have mentioned here. All we have today is a description; I will go into detail about Wavenis communication protocol, network architecture and communication hubs etc. in the next post.

 

 

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