diff --git a/protos/device_state.proto b/protos/device_state.proto
index 575f38f..7634f58 100644
--- a/protos/device_state.proto
+++ b/protos/device_state.proto
@@ -55,6 +55,28 @@ message SignalState{
   //信号机索引
   string  id = 1;
 }
+//信号机显示枚举定义
+message Signal {
+	enum Aspect {
+		//物理灭灯
+		OFF = 0;
+		//物理亮灯
+		ON = 1;
+		//绿灯亮
+		L = 2;
+		//红灯亮
+		H = 3;
+		//黄灯亮
+		U = 4;
+		//红灯且黄灯亮
+		HU= 5;
+		//白灯亮
+		B=6;
+		//蓝灯亮
+		A=7;
+	}
+}
+
 //站台状态
 message PlatformState{
   //站台索引