Mention Modbus TCP in the documentation too

Jalle19 · Sep 7, 2023 · 9cfb72b · 9cfb72b
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diff --git a/README.md b/README.md
@@ -9,7 +9,7 @@ settings), as well as an MQTT client which can publish readings/settings regular
 ventilation unit.
 
 Communication happens over RS-485 (Modbus RTU) by connecting a serial device to the "Freeway" port on the ventilation 
-unit's computer board.
+unit's computer board, or alternatively using Modbus TCP for newer units that can be connected to the local network.
 
 The REST endpoints for enabling/disabling the various modes are designed to be consumed by 
 https://www.home-assistant.io/integrations/switch.rest/ with minimal effort. See examples in the `docs/` directory.

diff --git a/docs/CONNECTION.md b/docs/CONNECTION.md
@@ -1,5 +1,16 @@
 # Connecting to an Enervent unit
 
+There are two ways to communicate with your ventilation unit:
+
+* Modbus RTU
+* Modbus TCP
+
+If your ventilation unit has an RJ45 port you can use Modbus TCP. Connect the unit to your local network and take note 
+of what IP address it has.
+
+If your ventilation unit does not have an RJ45 port (very common), read on. The rest of this document focuses on how
+to communicate using Modbus RTU.
+
 These instructions are based on:
 
 * https://doc.enervent.com/op/op.ViewOnline.php?documentid=999&version=1 (Freeway WEB-väyläsovitin - Asennus- ja käyttöohjeet)