From 5132b75fd957376a3a0efa0399e38979ffd9d9c5 Mon Sep 17 00:00:00 2001
From: Petr Vanek <petr.vanek@robe.cz>
Date: Wed, 14 Oct 2026 09:44:56 +0200
Subject: [PATCH] Clarify that ChannelFunctions of a logical channel must
 describe complete value range of a DMX channel

---
 gdtf-spec.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/gdtf-spec.md b/gdtf-spec.md
index 07ae9da4..ac557ba3 100644
--- a/gdtf-spec.md
+++ b/gdtf-spec.md
@@ -2089,6 +2089,8 @@ currently defined XML attributes of channel function are specified in
 
 </div>
 
+The channel functions of a logical channel shall describe the entire value range of the DMX channel. No gaps are allowed.
+
 Note:  
 For command based control systems, you can control the fixture by sending it a string in the following style:  
 `"/FIXTURE_ID/CUSTOM_NAME_CHANNELFUCTION ,f FLOAT_VALUE_PHYSICAL"`