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This page is under a construction. Please go here first, or go through the rest of this WiKi, which is in Czech language.

What does a "SDS" stand for ? This is a shortcut made of the Czech product line name, "Síťový Dohledový Systém". The English translation goes as a "Network Monitoring System".

What is so special about our devices ? Firstly, it is the price, quality, plug and play work, and most importantly the ability to run a user script (simple PLC program). The SDS devices are used by many ISPs in whole EU (mostly in the Czech and Slovak republic), and are field proven !


We sell our devices to the whole world. Please check out the prices at out official e-shop, and better yet write an email to our business responsible person, Mr. Tomas Prejda.

The name of the company making and selling the SDS devices, is: LazNET s.r.o. Czech Republic. We use the following brands: CSphone, OnlineTechnology, MereniEnergie.cz

Do not get confused, as the eshop is only in the Czech language. We do speak English, so do not worry to write us an email. Also, you might try the Google web page translator to translate the eshop's content into your native language.


  • SDS MICRO - two versions: LIGHT and DIN

What to do with SDS ?

There are two major targets:

  • energy measurement applications
  • ISP service applications

Of course, both those two applications can be combined !

Typical use of SDS devices by the ISP

The SDS device is used at the distribution point (Access Point). Such a point is equipped with various technologies, for example: various WiFi APs, some microwave links, switches, RouterBoards, etc.

As an ISP, what you need is to keep it running well all the time, and also to be informed about any problems. Plus there is a nice added value in for example the burglary protection, used energy measurement and reporting, backup power control, and so on.

All those functions can be done with any of the SDS devices (MICRO, MACRO), you just need to select the one that fits the particular needs of yours.

1. EXAMPLE : 230Vac failure detection

The most common task for an ISP is to detect the presence of utility power for the technology point.

Typically, you have a 230Vac mains (depends on your country, of course) to power everything. But what if it is switched off? Of course, the UPS will take care of powering the technology, but the ISP needs to know about the failure. An email or a SMS would be nice, or maybe you are using the central monitoring system (for example, The Dude, or many others of course).

What you need to realise a monitoring device:

  • SDS MICRO (either LIGHT or DIN version, this depends only on the minor details, such is a size of space you have to use and so on)
  • simple RELAY with a 230Vac coil and one switching isolated contact

Provide the connection as per the picture (of course, you will modify it as per your specific situation)


Now the last item is to configure the SDS device to provide the correct function, as is:

  • send an email (or multiple emails)
  • send a SMS (using the mobile operator internet gateway or email gateway)
  • control the SDS module outputs (for example, use a relay to switch to another power input)

So, how to configure all of that, and just the way you need it? By using your own SDS-C program ! You have the ultimate possibility to describe the complete behavior of the SDS device, just by writing a simple script (and upload it online to a SDS device, the script stays in the permanent memory, of course you can change it any time).

Example SDS-C program (behavior scripts) are available - like this one

2. EXAMPLE : IP watchdog

Another important function is the constant monitoring of any IP device (router, AP, for example) - does it respond or is it hung up ? All the devices are usually at very remote places, and it is not possible to go there and manually take care of the restart and so on.

By using the IP watchog, the SDS device continously uses ICMP PING ECHO to check if the monitored device is working and responding. If there is no response, then you have to restart the monitored device.

The application is simple - just use the SDS device with IP watchdog activated and connect a relay, that can cut the power to the monitored device.

The IP watchdog is configurable: a) over the web management page b) by defining it by your SDS-C program (script)

-todo- picture here

The SDS device also has a DNS and WWW watchdog - you can monitor your DNS or web server, and if it does not respond with the correct service (for example, no web pages served any more), you can, for example, send an email to admin, or restart the server, or ...

3. EXAMPLE : Energy measurement also known as a Smart metering

Every ISP has to pay for all the used electricity at all the technology points. But how much exactly? And is nobody stealing from you?

The SDS devices allow for a direct electricity meter connection, using the S0 (impulse) interface.

Using this feature, you can:

  • see the actuall immediate power consumption (Watts - fully online !)
  • see the total amount consumed (kiloWatthours)

So by checking the actuall power usage, you can online monitor all your equipment - for example, you know, that you AP point is drawing 150Watts if everything is OK. But then the power draw drops - and you know, something is not right and you are informed about the problem right away! Or the power consumption goes way high - and you know, that either someone is stealing, or that there is any other problem, you can solve before a disaster happen.

You can use SNMP to read the values, or your SDS-C program can analyse it and send it over an email (or by SMS every week, for example), or you can log in to SDS device and see it in a nice, live updated, web page.

Also, the SDS devices allow for not just one, but more energy measurement devices to be connected simultaneously ! For example, the SDS MACRO allow for up to four devices to be independently measured !

Note: of course, you can connect not just the electricity meter, but also the water consumption meter, the gas meter, heat consumption meter, etc.

As an ISP, you can provide an excellent service to your customers, allowing them to see their electricity and energy usage online. Just install the SDS MICRO (or MACRO) at the customer site, connect it to your network and to the energy meters, and let the users to see the numbers ! Here is a great opportunity how to make nice cash - and let the people actually save and conserve the energy !

Pictures: see the gallery of one of our customers, right here. We thank this person for sharing the valuable information with other people. Note. please respect his copyright over the pictures.

Also: See the picture here.

4. EXAMPLE : Virtual COM port

All devices can transfer serial data over Ethernet - this is called a "virtual COM port".

For example, the SDS MICRO DIN has the CANNON DB-9 connector with RS-232 to be used.

You can use it to add a distant COM port to your computer, or just simply telnet to the SDS device a write and read from its COM port.

This is usefull for example as an distant console port (for Cisco, Mikrotik) - so you can connect to the console port of the remote device without the need to be physically present - just use the SDS to bypass the distance.

Or you can write a SDS-C program to control the SDS device COM port, this is usefull for some automation tasks (we provide a relay boards, with multiple I/Os, that can be connected to SDS device over the serial line).

5. EXAMPLE : Web thermometer

All devices can connect up to 16 (or 32) external thermometers ( = DS18B20 devices using the 1-Wire bus).

You can read the values of each thermometer via the device web interface, SNMP, TXT file, or control anything by the SDS-C program.

ISPs can use this for showing the temperature at various points to the public and customers (see for example this local ISP - the temperatures are listed at the bottom of the page - under the label "AKTUÁLNÍ TEPLOTA ").

Also, you can create a SDS-C program, that can control the heating and cooling based on the measured temperature. Usually the ISP places one temperature sensor outside and one inside the equipment box or building, and then control the fans, cooling and heating system based on the difference between the inside and outside temperature.

NOTE : You can mix it all together !

Yes, all what has been described here can be used all together, in one SDS device. For one price.

If you need a specific project, contact us, we will like to consult and help you.

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