> For the complete documentation index, see [llms.txt](https://docs.wiclax.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.wiclax.com/en/use-wiclax/acquisition-of-timing-data/the-different-systems.md).
# The different systems
Wiclax software is interfaced with different timing hardware systems.
This section reviews the different systems interfaced with Wiclax and explains how to implement them very quickly.
Among these hardware we will distinguish:
## **The RFID decoders, active and passive**
These devices are developed specifically for sport timing and operate according to common principles. They are built around a microcontroller that drives an RFID (Radio Frequency Identification) system. Most of them have an internal clock (RTC). They are capable of recording detections and sending them back in real time or in a delayed manner, to a local computer or in the cloud.
The local connection can be established by means of a wired or wifi TCP-IP connection or through a USB port. The serial port tends to disappear.
## **The external stopwatches**
These devices are developed to generate passing times to which it is sometimes possible to add bib numbers. They can be associated with photoelectric cells or detection gates.
Local connection can also be established using a wired or Wi-Fi TCP-IP connection or through a USB or even serial port.
## **The photo finish**
These are specific devices that film the finish line. They come with software that allows them to communicate with Wiclax, most of the time via a TCP-IP connection.
{% hint style="info" %}
The trial version you can freely download on wiclax.com allows you to take your first steps without delay with your own timing equipment. You just have to limit the number of competitors entered below 20.
{% endhint %}
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