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. You can find links to other articles describing the technologies and terms used in this article. Clarifications on the types of synchronisation, the format of packaged messages and the differences between the two modifications are provided.

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

An article where you can find details on the terms I use in other articles here on the website. For the purposes of the article I have used a model representation of message packaging method, part of the most popular fiscal device communication protocol.

The aim of this article is not to analyse the subject in depth but to give a general idea of the differences between asynchronous and synchronous communication. These are terms which I use in various articles on the website and here you can find clarification on what I mean.