diff --git a/proto/src/model.proto b/proto/src/model.proto
index d5b12e5..97ed325 100644
--- a/proto/src/model.proto
+++ b/proto/src/model.proto
@@ -113,6 +113,7 @@ message Transponder {
   Kilometer km = 2;
   string sectionId = 3; //关联的区段
   DevicePort turnoutPort = 4; //关联的区段端口
+  string fixedTelegram = 5;//无源应答器固定报文
 }
 
 //坡度