| 摘要 |
A system for controlling the transmission of data messages from a data handling device having a memory and data input apparatus such as a keyboard to a receiving station such as a central processor, the system (1) controlling the transmission to the receiving station of identifying data and a stored data message in response to transmit signals, (2) preventing input of data to the memory during the period of time between an initial transmit signal and a subsequent message acknowledgement from the receiving station, and (3) changing the message identifying data in response to the message acknowledgement such that successive data messages will be prefaced with different message identifying data.
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