diff --git a/lib/kiss/kiss_serial.rb b/lib/kiss/kiss_serial.rb
index 729cf0df888eb8aee2eef74ca283f86dfce87a67..6eaeed6558c10554d0a0f68a114a4ecf563d41d0 100644
--- a/lib/kiss/kiss_serial.rb
+++ b/lib/kiss/kiss_serial.rb
@@ -30,6 +30,7 @@ module Kiss
         protected
         def read_interface
             read_data = @serial.read(@read_bytes)
+            p read_data
             if read_data
                 return read_data.chars.map { |c| c.ord }
             else