diff --git a/ls-bus-guide/headers/fmi3LsBusUtil.h b/ls-bus-guide/headers/fmi3LsBusUtil.h
index 329fa02..2e64d0f 100644
--- a/ls-bus-guide/headers/fmi3LsBusUtil.h
+++ b/ls-bus-guide/headers/fmi3LsBusUtil.h
@@ -138,6 +138,30 @@ typedef struct
     }                                                                    \
     while (0)
 
+/**
+ * \brief Checks whether a buffer variable is empty.
+ *
+ * \param[in] BufferInfo  Pointer to variable of type \ref fmi3LsBusUtilBufferInfo.
+ */
+#define FMI3_LS_BUS_BUFFER_IS_EMPTY(BufferInfo)                          \
+    (BufferInfo)->writePos == (BufferInfo)->start ? fmi3True : fmi3False
+
+/**
+ * \brief Returns the start address of the  buffer variable.
+ *
+ * \param[in] BufferInfo  Pointer to variable of type \ref fmi3LsBusUtilBufferInfo.
+ */
+#define FMI3_LS_BUS_BUFFER_START(BufferInfo)                          \
+    (BufferInfo)->start
+
+/**
+ * \brief Returns the length of the  buffer variable.
+ *
+ * \param[in] BufferInfo  Pointer to variable of type \ref fmi3LsBusUtilBufferInfo.
+ */
+#define FMI3_LS_BUS_BUFFER_LENGTH(BufferInfo)                          \
+    (BufferInfo)->writePos - (BufferInfo)->start
+
 /**
  * \brief Reads the next bus operation from a buffer.
  *