fix bug

Author: anla-xu

pymycobot/common.py

@@ -393,8 +393,10 @@ def _process_received(self, data, genre, arm=6):
             data_len = data[header_i + 2] - 3
 
         unique_data = [ProtocolCode.GET_BASIC_INPUT, ProtocolCode.GET_DIGITAL_INPUT]
-
-        if cmd_id in unique_data and arm != 14:
+        if unique_data == ProtocolCode.GET_DIGITAL_INPUT and arm == 14:
+            data_pos = header_i + 4
+            data_len -= 1
+        elif cmd_id in unique_data:
             if arm == 12:
                 data_pos = header_i + 6
             else: