diff --git a/protos/stationLayoutGraphics.proto b/protos/stationLayoutGraphics.proto
index 0eb8245..9c780d6 100644
--- a/protos/stationLayoutGraphics.proto
+++ b/protos/stationLayoutGraphics.proto
@@ -349,7 +349,7 @@ message Transponder { // 应答器
   KilometerSystem kilometerSystem = 5; //公里标
   RelatedRef TransponderRef = 6;       //关联关系
   repeated string centralizedStations = 7; // 集中站列表
-  string fixedTelegram = 8;//无源应答器固定报文
+  bytes fixedTelegram = 8;//无源应答器固定报文
   TransponderTypeEnum type = 9;//应答器类型
 }