diff --git a/gimbal_ctrl/sv_gimbal_io.hpp b/gimbal_ctrl/sv_gimbal_io.hpp
index 0b0e1c7..9781e48 100644
--- a/gimbal_ctrl/sv_gimbal_io.hpp
+++ b/gimbal_ctrl/sv_gimbal_io.hpp
@@ -39,9 +39,8 @@ public:
 
     virtual bool inPutByte(IN uint8_t *byte)
     {
-        if (ser->available() > 0)
+        if (ser->read(byte, 1))
         {
-            ser->read(byte, 1);
             return true;
         }
         return false;