AWG: Use write_raw instead of write_ascii_values

This is needed because we are working with a raw bytes array

Author: rassouly

exopy_hqc_legacy/instruments/drivers/visa/tektro_awg.py

@@ -514,9 +514,9 @@ def send_load_awg_file(self, awg_file, filename='setup'):
         """
         name_str = 'MMEMory:DATA "{}",'.format(filename+'.awg')
         size_str = ('#' + str(len(str(len(awg_file)))) + str(len(awg_file)))
-        mes = name_str + size_str + awg_file
+        mes = name_str + size_str
         self.write('MMEMory:CDIRectory "/Users/OEM/Documents"')
-        self._driver.write_ascii_values(mes)
+        self._driver.write_raw(mes.encode('ASCII') + awg_file)
         self.write('AWGCONTROL:SRESTORE "{}"'.format(filename+'.awg'))
 
     @secure_communication()