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TCW220 and TCW241 now support TLS protocol

TCW220 – Ethernet data logger and TCW241 – Ethernet I/O now support TLS protocol.

TCW220-and-TCW241-now-support-TLS-protocolTLS (Transport Layer Security) and SSL (Secure Sockets Layer) protocols are providing encryption of data between client and server when data is transmitted over insecure channel such as the Internet, for example – sending mail.

SSL v3.0 is considered finaly unusable security protocol. It is believed that TLS v1.0 as a direct successor to SSL v3.0 is just a little more sure of it. Later versions TLS v1.1 and TLS v1.2 is considered significantly more secure and are widely used.

For the above reasons, most recently public mail servers like,,, etc., refused to support SSL v3.0 and now work only with TLS.

These changes led us to realize the support of TLS protocol for the SMTP clients, dedicated to controllers series TCW2xx. The controllers mainly work with TLS v1.2 and TLS v1.1, but for compatibility with any servers as maintain less secure TLS v1.0.

Our free service – TCW Gateway for controllers TCW2xx will be stopped until the end of the year.

More information and new FW versions can be found on product pages of TCW220 and TCW241. We strongly recommend to update your controllers.

October 20th, 2016|News|

Google and Yahoo have disabled SSLv3 protocol

Google put away SSLv3 in all of its front-end servers. The same did Yahoo.

disabled_SSLv3This came as no surprise, because of the fact that SSLv3 has been deemed unsecure by the Internet Engineering Task Force.

On the other hand at the moment SSLv3 is the only protocol which TCW2xx controllers support for security socket layer.
As a result our customers can’t use public servers, which don’t suport SSLv3, for mail alerts.

The Teracom team is working hard to implement new crypto protocols TLS1.x. This task is not so easy and will takes some time.

Until we will be ready with TLS support, our customers have a few possibilities for mail sending:

– To use mail servers without security socket layer (SSL/TLS);
– To use mail servers with SSL support – there are still many public ones;
– To use our service tcw gateway. It is free of charge, but not 100% guaranteed.

We have just released new FW versions with tcw gateway functionality for TCW240, TCW241 and TCW220.

August 25th, 2016|News|

Rain detector usage with TCW220

In this article will be shown how to use Ethernet data logger TCW220 with a rain detector.

Two different rain detectors are used – RG-11 and CON-REGME. RG-11 is manufactured by Hydreon Corporation, while CON-REGME is manufactured by B+B Thermo-Technik.

1. Test setting

An example test setting is shown on Fig. 1. Both rain detectors are powered by the controller TCW220.

In the event of rain or snow, they send a signal to the digital inputs of Ethernet data logger TCW220 (the rain detector RG-11 to digital input 1, the rain detector CON-REGME to digital input 2). The controller TCW220 is equipped with a logger which enables the storage and comparison of the information received by the two rain detectors.

rain detector test schematic
Fig. 1

The corresponding connections between the controller and the rain detectors are shown in Table 1.

rain detector test table of wiring

Table 1

To get accurate measurements from the rain detectors, they have to be mounted on a spot where there is free access to rain.

rain detector test mounting

A mandatory requirement when assembling the rain detectors is all components to be dry because any moisture in them creates condensation which may damage the rain detector.

2. Principle of operation of rain detector CON-REGME

This type of rain detector uses a sensor that detects the conductivity changes on the sensor surface. That change leads to the activation of a relay which then sends a signal to the digital input of the controller TCW220.

This rain detector operates at different sensitivity levels which can be changed so that the presence of fog can also be detected. The sensor surface can be heated which will enable operation at low temperatures and will speed up the drying process of the sensor.

CON REGME rain detector


3. Principle of operation of rain detector RG-11

This type of rain detector uses infrared rays that are reflected by a lens. When there is water on the lens, some of the rays get deflected.

The sensor detects the difference in the intensity of the rays, and then activates a relay which sends a signal to the digital input of the controller TCW220.

These rain detectors can operate at different sensitivity levels and in various modes that are changed by using DIP switches.

RG11 rain detector test


4. Test results

Figure 2 shows the feature of the controller TCW220 to display the saved data from the rain detectors and to compare them.

In the case below, the rain detector CON-REGME, using a sensor for changes in the conductivity, is the first to detect the presence of rain in both measurements. The detector using infrared rays has registered it later because depending on its operating mode, it will send a signal for the presence of rain at specific intensity of the rain.

A signal that it is not raining is first sent by the rain detector RG-11, and later by CON-REGME whose surface dries up a little more slowly.

rain detector test graph

Graph 1

5. Conclusion

Each of the tested sensors in combination with Ethernet data logger TCW220 can be used for condensation sensing, irrigation control, automation of greenhouses, balcony sun shades, and so on.

August 22nd, 2016|Blog|

TCW Control with new versions

TCW Control with new updates for iOS and Android.

The new versions support Ethernet I/O module – TCW241 and Ethernet data logger – TCW220.
With these changes the number of supported devices is five – TCW122B-CM, TCW181B-CM, TCW240B, TCW241 and TCW220.

As before all devices should have public static IP address or should be placed behind a router with public static IP address and port forwarding.
Some minor changes in GUI, are also included.
New versions are ready for download and upddate.

June 11th, 2016|News|

Internet of things (IoT)

If you have never heard about Internet of things (IoT), probably now is the perfect time to learn about this application. This relatively new concept can be seen nowadays integrated in various manufacturing installations, as well as in the service sector and our daily lives. The main goals of this application is to bring a maximum level of automation to some processes, to optimize your costs and to save you a lot of time.

What exactly is the Internet of things (IoT)

In Internet of things (IoT), various physical objects are connected to the internet and can be identified by different devices. The technologies used for this purpose can be manifold – from sensors measuring temperature and humidity to QR codes and solutions based on RFID technology.

How the Internet of things (IoT) can be used in practice

It is the first topic to discuss after such a general explanation of the concept. In the following lines we’ll try to illustrate the practical use of this application.

When you are having fun

The different technologies used for the realization of the Internet of things (IoT) concept, provide an infinite number of opportunities to improve the service in the field of entertainment and education. Various museum and art exhibitions may be presented in a more attractive and interesting way. Also, you may create a special atmosphere in your backyard during your garden party with color and lighting, which you control through your smartphone.

In business and healthcare

The Internet of things (IoT) and more precisely the RFID technology can be used to facilitate the inventory of an enterprise, a library or a bank. All that is needed are RFID tags and a mobile reader and the time for inventory can be shortened up to 20 times. It also significantly reduces the chance of making a mistake during the inventory.

Technologies based on RFID can be used to detect the location of objects, people and animals within couple of seconds. You can also gather some information about the behavior and the expectations of the participants in various events, in order to offer them a better entertaining program next time.

The internet of things (IoT) might be of primary importance for the medicine and healthcare. The options for identification (also possible in real time) and the fast processing of large amounts of data and information, allow for better patient’s care and more rapid intervention in emergency situations. The integration of applications based on the RFID technology in emergency centers and nursing homes has already given some excellent results.

At home

All appliances in your home can be connected to the internet and can be run through a computer, tablet or phone, no matter how far from home you are at a given moment. You can control the heating or put automatic settings on it, you may solve once and for all the problem with the lights, which someone always forgets to turn them off. You may control the cook or the boiler. You may protect your home through a security system that includes video surveillance or use sensors for mechanical control of doors and windows or even install a fire alarm connected straight to the fire station.

Your “Smart” home will allow you to optimize your energy costs without losing your comfort and it also brings security and protection of your place to a higher level.

Are you intrigued by what you have just read? Internet of the things (IoT) can help you to save time, money, troubles, it will develop faster and better your business or will make you feel more comfortable at home. You’ll be fully surprised by the opportunities this new concept may offer.

May 25th, 2016|Blog|