diff --git a/component/train.go b/component/train.go
index 42c72b1..cb91b0c 100644
--- a/component/train.go
+++ b/component/train.go
@@ -73,6 +73,18 @@ func (t *TrainBtm) baliseMessageCounterAdd1() {
 	}
 }
 
+// SetBaliseTelegramHadSentAndGet 获取未发送的应答器报文并标记已发送
+// 通过Canet发送应答器报文时调用该方法来获取要发送的报文
+func (t *TrainBtm) SetBaliseTelegramHadSentAndGet() *TrainBaliseTelegram {
+	for _, tbt := range t.ScannedBalises {
+		if !tbt.sent {
+			tbt.sent = true
+			return tbt
+		}
+	}
+	return nil
+}
+
 const scannedBalisesMax = 3
 
 // Scanning BTM通过车载应答器天线接收到应答器报文