| 摘要 |
PURPOSE:To omit the transfer of information in unnecessary status by a terminal device, by adding information which indicates whether the transfer request of the next data is performed when the data is received in transferring the data from a central device or after waiting the end of output processing. CONSTITUTION:A control bit is added at the head of an output message from a central device, and when this is 1, it shows a mode not requiring the transfer of terminal status information, i.e., in case of special message such as telegraphic message exchange, and when it is 0, it means a normal message, i.e., a mode requiring the transfer of terminal status information. This output data passes through a channel 50 and enters a transmission/reception circuit 31, a program controlling mechanism 32 is started and the usage state of an output buffer 36 is checked. If it is in use, the output message is stored in an output buffer 33 by waiting the end, and the controlling mechanism 32 waites for the data from the buffer 33 after the output of an output device is possible, and when the control bit is checked and it is zero, the end report is waited from the output device, and when it is 1, the output request of the next data is transmitted to the central device for the advancing processing. |
