diff --git a/proto/src/model.proto b/proto/src/model.proto
index 97ed325..b7fa03f 100644
--- a/proto/src/model.proto
+++ b/proto/src/model.proto
@@ -113,7 +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
+  bytes fixedTelegram = 5;//无源应答器固定报文
 }
 
 //坡度
diff --git a/repository/model/proto/model.pb.go b/repository/model/proto/model.pb.go
index cde87ee..07faa88 100644
--- a/repository/model/proto/model.pb.go
+++ b/repository/model/proto/model.pb.go
@@ -1333,7 +1333,7 @@ type Transponder struct {
 	Km            *Kilometer  `protobuf:"bytes,2,opt,name=km,proto3" json:"km,omitempty"`
 	SectionId     string      `protobuf:"bytes,3,opt,name=sectionId,proto3" json:"sectionId,omitempty"`         //关联的区段
 	TurnoutPort   *DevicePort `protobuf:"bytes,4,opt,name=turnoutPort,proto3" json:"turnoutPort,omitempty"`     //关联的区段端口
-	FixedTelegram string      `protobuf:"bytes,5,opt,name=fixedTelegram,proto3" json:"fixedTelegram,omitempty"` //无源应答器固定报文
+	FixedTelegram []byte      `protobuf:"bytes,5,opt,name=fixedTelegram,proto3" json:"fixedTelegram,omitempty"` //无源应答器固定报文
 }
 
 func (x *Transponder) Reset() {
@@ -1396,11 +1396,11 @@ func (x *Transponder) GetTurnoutPort() *DevicePort {
 	return nil
 }
 
-func (x *Transponder) GetFixedTelegram() string {
+func (x *Transponder) GetFixedTelegram() []byte {
 	if x != nil {
 		return x.FixedTelegram
 	}
-	return ""
+	return nil
 }
 
 // 坡度
@@ -3172,7 +3172,7 @@ var file_model_proto_rawDesc = []byte{
 	0x20, 0x01, 0x28, 0x0b, 0x32, 0x11, 0x2e, 0x6d, 0x6f, 0x64, 0x65, 0x6c, 0x2e, 0x44, 0x65, 0x76,
 	0x69, 0x63, 0x65, 0x50, 0x6f, 0x72, 0x74, 0x52, 0x0b, 0x74, 0x75, 0x72, 0x6e, 0x6f, 0x75, 0x74,
 	0x50, 0x6f, 0x72, 0x74, 0x12, 0x24, 0x0a, 0x0d, 0x66, 0x69, 0x78, 0x65, 0x64, 0x54, 0x65, 0x6c,
-	0x65, 0x67, 0x72, 0x61, 0x6d, 0x18, 0x05, 0x20, 0x01, 0x28, 0x09, 0x52, 0x0d, 0x66, 0x69, 0x78,
+	0x65, 0x67, 0x72, 0x61, 0x6d, 0x18, 0x05, 0x20, 0x01, 0x28, 0x0c, 0x52, 0x0d, 0x66, 0x69, 0x78,
 	0x65, 0x64, 0x54, 0x65, 0x6c, 0x65, 0x67, 0x72, 0x61, 0x6d, 0x22, 0x53, 0x0a, 0x05, 0x53, 0x6c,
 	0x6f, 0x70, 0x65, 0x12, 0x0e, 0x0a, 0x02, 0x69, 0x64, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52,
 	0x02, 0x69, 0x64, 0x12, 0x22, 0x0a, 0x03, 0x6b, 0x6d, 0x73, 0x18, 0x02, 0x20, 0x03, 0x28, 0x0b,
diff --git a/repository/transponder.go b/repository/transponder.go
index e08f746..762b231 100644
--- a/repository/transponder.go
+++ b/repository/transponder.go
@@ -9,10 +9,10 @@ type Transponder struct {
 	//section     *PhysicalSection
 	//turnoutPort TurnoutPort
 	linkPosition  *LinkPosition
-	fixedTelegram string //无源应答器固定报文
+	fixedTelegram []byte //无源应答器固定报文
 }
 
-func NewTransponder(id string, km *proto.Kilometer, fixedTelegram string) *Transponder {
+func NewTransponder(id string, km *proto.Kilometer, fixedTelegram []byte) *Transponder {
 	return &Transponder{
 		Identity:      identity{id, proto.DeviceType_DeviceType_Transponder},
 		km:            km,