diff --git a/dmxbox.ino b/dmxbox.ino
index 7aaeb4c..6f71801 100644
--- a/dmxbox.ino
+++ b/dmxbox.ino
@@ -1,36 +1,52 @@
 #include <DMXSerial.h>
 
-String chaine = "";
+//Détail des trames
+//Réception
+//Demande de mise à jour d'un canal         0xC 0xCANAL 0xVALUE
+//Demande de version                        0xD
+//Envoi
+//Envoi d'un status prêt                    0xA
+//Envoi d'un status de mise à jour réussie  0xE
+//Envoi de la version firmware              0xD VERSION
 
-//Traite la commande entrante
-void traiterCommande(){
-  //Récupération version
-  if(chaine == "VERSION") Serial.println("DMXBOX V1.0.0");
-  //Affectation canal
-  else if(chaine.length() == 6) setCanal(chaine.substring(0,3).toInt(), chaine.substring(3,6).toInt());
-}
+
+#define FIRMWARE_VERSION "DMXBOX V0.0.2" 
+
+unsigned int receiveState = 0;
+unsigned int channel = 0;
 
 //Modifie un canal DMX512
-void setCanal(int number, int value){
+void setCanal(unsigned int number, unsigned int value){
   DMXSerial.write(number, value);
-  Serial.println("OK");
+  Serial.write(0xE);
 }
 
 //Initialisation
 void setup() {
   Serial.begin(9600);
   DMXSerial.init(DMXController);
+  Serial.write(0xA);
 }
 
 //Interception des commandes de canaux
 void loop() {
   if(Serial.available())
   {
-    char c = Serial.read();
-    if(c == '\n' || c == '\r'){
-      traiterCommande();
-      chaine = "";
+    unsigned int received = Serial.read();
+    if(received == 0xD && receiveState == 0) {
+      Serial.write(0xD);
+      Serial.println(FIRMWARE_VERSION);
+    }
+    //Demande de paramétrage canal
+    else if(received == 0xC && receiveState == 0) receiveState = 1;
+    else if(receiveState == 1) {
+      channel = received;
+      receiveState = 2;
+    }
+    else if(receiveState == 2){
+      setCanal(channel, received);      
+      receiveState = 0;
+      channel = 0;
     }
-    else chaine += c;
   }
 }