Category Archives: IT tools

How to work with ThingSpeak.com on ESP8266? Code examples.

There are a lot of different cloud services in the Internet working as a storage to accumulate telemetry data from IoT devices. It’s quite comfortable services. You don’t need to spend some time to install a server to collect data … Continue reading

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RS-485 shields for Arduino

There are a lot of different variants of RS-485 shields for Arduino: https://www.waveshare.com/wiki/RS485_CAN_Shield  https://www.tinyosshop.com/arduino-rs232-rs485-shield https://www.dfrobot.com/wiki/index.php/IO_Expansion_Shield_For_Arduino(V5)_(SKU:_DFR0088) https://www.hwhardsoft.de/english/projects/rs485-arduino/ Example of using the shield with Modbus RTU termo sensor. Example, how to work with not expensive Arduino RS485 Shield ordered from Aliexpress.

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4-x relay board managed by Modbus RTU protocol (RS-485)

To test a device management by Modbus RTU commands, we use the circuitry of 4 relays controlled by the STM8S103 controller. (Relay MCU 4-way relay-communication board (RS-485). Manage the relay  To turn a relay on/off we will use Modbus “Write Single Coil … Continue reading

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Inexpensive Modbus RTU to Modbus TCP Elfin EW-11 Wi-Fi converter (RS485)

Modbus RTU (RS485 interface) to Modbus TCP converters from the top producers like Moxa, Advantech, Schneider, ABB and etc. are quite expensive. Of course, the quality and reliability of these industrial devices are really very high. Sometimes the most important parameter … Continue reading

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How to connect .NET application to OTRS web service

Since the official WSDL file had published on GitHub doesn’t work with .NET applications, I try to found how to fix its. Thanks to Andrey Antipov who helps me found some mistakes and colleagues from OTRS forum. Connection from .NET application to OTRS web … Continue reading

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Working with InstallShield Limited Edition

Relative path in InstallShield is not so easy to use. Try to use such hack in Install Shield configuration file (*.isl). Find section <table name=”File”> where located links to all files which are included in installation package. Then use prefix … Continue reading

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WMI Filter examples

1. Terminal server detection. Class Win32_TerminalServiceSetting is missed at the client OS. So, WMI filter return FALSE if there is no such class (for regular desktop or servers) and TRUE if class exists and return proper value. root\CIMV2. SELECT * FROM … Continue reading

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