The article describes a fiscal device communication protocol. It concerns two modifications to this protocol, which are characteristic of some of the most-widely used on the market models of fiscal devices manufactured by Datecs Ltd. 

If you are not familiar with the terms related to this protocol, it would be helpful to take a look at the links related to the terminology before proceeding alone with the topic in depth. Here you can find links to other articles describing the technologies and terms used in the articles. Clarifications on the types of synchronisation, the format of packaged messages and the differences between the two modifications are provided. 
If you’re already an expert in the topic or are familiar enough with the terminology, you can confidently skip this part and go on ahead. My goal in this part is to help those who have yet to be introduced to the topic.

 

If you are still interested, you can find the article here.