From a33ff0a3081b5b127305050c479428321980d211 Mon Sep 17 00:00:00 2001
From: Peter M. Groen <pgroen@osdev.nl>
Date: Sat, 24 Sep 2022 12:56:49 +0200
Subject: [PATCH] Update protocol.md

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 documentation/protocol.md | 13 +++++++++++++
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+# MODBUS Application Protocol SPecification V1.1b3
+
+## Introduction
+
+MODBUS is an application layer messaging protocol for client/server communication between
+devices connected on different types of buses or networks.
+
+It is currently implemented using:
+
+* TCP/IP over Ethernet. See MODBUS Messaging Implementation Guide V1.0a.
+* Asynchronous serial transmission over a variety of media (wire : EIA/TIA -232-E, EIA-422,
+EIA/TIA-485-A; fiber, radio, etc.)
+* MODBUS PLUS, a high speed token passing network.
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