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Data logging and monitoring software for COM, TCP, USB, ports

Our advantages:

  • Our data logging software can capture data from various serial port types (RS232, RS485, USB, VCP).
  • Data logging and monitoring software for many protocols and data formats like TCP, UDP, NMEA, MODBUS, OPC and DDE.
  • Data loggers collect data in real-time 24x7.

Latest news

October 20, 2025
SQL Database Professional 5.0.1 build 1020 has been released.
Added support for the SQL Server 2025 database. More on.
October 20, 2025
Ann: New build 5.0.1 build 1020 of Cloud Database Professional is available.
Added support for the SQL Server 2025 database. You can find the update in the Download area.
October 20, 2025
All our data loggers gets a couple small bugfixes.
Now, all our loggers close faster (it is mostly related to slow computers). The new version of the software you can download in the Download area.
October 16, 2025
Datatag Link comes with the following changes:
- MODBUS TCP: Improved reliability of the TCP interface to reduce dropped or missed requests under high load and unstable network conditions.
- MODBUS (slave mode): Fixed rare cases where previous versions could miss incoming requests; slave responsiveness and request handling are now more robust.
- MODBUS (slave mode): Fixed an issue where the device occasionally could not detect link activity and unnecessarily restarted the connection.
- MODBUS (slave mode): Now, multiple clients can connect to the same slave device.
- Transaction Log window: Reworked UI and backend so the log remains responsive with large numbers of records; loading and scrolling are now fast and no longer cause the window to freeze.
- Fixed a bug related to incomplete loading of the program settings.
Download.
October 8, 2025
The MODBUS plugin has been slightly modified to version 5.0.1 build 1007.
We've improved reading data from Sunspec-compatible MODBUS devices. Improved the "MODBUS slave" mode. Take a moment and then download it in the Download area.
October 8, 2025
DDE server comes with the following changes:
Now, the plugin can send real-time data about active items to a console application. It makes it simpler for you to keep an eye on the service's data flow status. More on.

news archive

Our software overview: RS232 software