diff --git a/internal/device/logic.go b/internal/device/logic.go
index b74ed25..0b6948c 100644
--- a/internal/device/logic.go
+++ b/internal/device/logic.go
@@ -56,13 +56,13 @@ func (s *DeviceState) handleWriteCommand(cmd string) string {
 		return "ERRORE: I comandi 'W' sono accettati solo in modalità programmazione."
 	}
 
-	// Parse command format: "W<id> <value>"
-	parts := strings.Fields(cmd)
+	// Parse command format: "W<id>=<value>"
+	parts := strings.SplitN(cmd, "=", 2)
 	if len(parts) != 2 {
 		return "ERRORE: Formato comando non valido"
 	}
 
-	// Extract parameter ID
+	// Extract parameter ID (remove "W" prefix from first part)
 	idStr := strings.TrimPrefix(parts[0], "W")
 	id, err := strconv.Atoi(idStr)
 	if err != nil {