US Patent 9280690 Writing apparatus, writing system, and writing method

A writing apparatus to which an external writing unit is connected comprises a writing unit that write, to a write object provided to a conveyed item, identification information thereof; a first reading unit in downstream side in a conveying direction than the writing unit, that reads identification information from the write object; a determination unit that determines whether the read identification information is consistent with identification information having to be written to the write object; and a notification unit configured to, when it is determined that identification information written to a first write object and read by the first reading unit is inconsistent with identification information having to be written to the first write object, notify the external writing unit of recovery information including the identification information having to be written to the first write object and/or a write content thereof.