A month ago I posted about Coronis telemetry devices. We saw that they have IP68 devices that can read remotely via radio frequency (on the 868MHz band), digital inputs, 4-20mA or 0-10V analog inputs and temperatures/meters for water/gas/electricity. A lot longer ago, I also posted a video about the MTX-Industrial modem which you can optionally order with a Zigbee, Bluetooth or Coronis communications card.

So taking advantage of all of this, I have included an additional, interesting feature to the new MTXTunnelv5.6 (which is an application that as many of you know can be requested in any programmable MTX terminal). I have added a GPRS-Coronis communications gateway.

What do you use a GPRS-Coronis gateway for?

Let’s take an example. Imagine that you have a large area (several kilometres squared) with several hundred water meters that you want to read every day. A water meter quite simply generates a pulse (dry contact) for every X litres of water that flows through it. Therefore we will physically connect a Waveflow to each water meter. The purpose of each Waveflow is to count pulses that are generated by the water meter that it’s associated with i.e. said simply each Waveflow will know about the water that has flown through the meter at all times.

Obviously to read meters we could go to wherever they are every day with a PC + Waveport, but it would probably be better to take a reading from your own office as it’s warm in winter and cool in summer and you also avoid travel costs.  This is where you will find the new GPRS-Coronis gateway useful. Let’s look at this explanatory graph:

concentrador-gprs-coronis-w

As you can see the communications hub is an MTX-Industrial (with optional internal Wavecard) + MTXTunnelv5.6.

Very good and how do I read the data from meters from my office?

Among all of its features, you can use Telnet with MTXTunnel. When connecting to MTXTunnel from your office via Telnet you can send AT commands (e.g. switch a relay remotely), read a digital or analog input, read GSM coverage etc. So I’ve added two simple AT commands called AT^MTXTUNNEL=SETWAVENIS,tramawavenis and AT^MTXTUNNEL=GETWAVENIS. With these two AT commands you can directly send Wavenis frames to the MTX-Industrial’s internal Wavecard via Telnet. This will allow you to read and connect to Waveflow meters.

Yes the MTXTunnelv5.6′s new feature doesn’t get rid of the fact that you have to take a look at the Wavenis protocol manual, but it can save a lot of work. For example if I want to communicate with a remote Waveflow I only have to do something like this:

telnet-wavenis

This means that with “AT^MTXTUNNEL=SETWAVENIS”, we send the “frame in question” to a Waveflow and with “AT^MTXTUNNEL=GETWAVENIS” we get the response received from Waveflow. It’s as simple as that. The same goes for being used with any Coronis device, i.e. to monitor temperatures (wavetherm), distributed digital inputs/outputs etc. You have more information in the manual and of course if you have any doubts you can tell me on the blog or via email jose@blogelectronica / jgallego@matrix.es


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