| 摘要 |
PURPOSE:To transmit again a temporarily interrupted command after the trans mission of the most preferential command by interrupting temporarily the trans mission of the command which is processed at present if the command to be processed most preferentially occurs. CONSTITUTION:When an emergency command is issued from a processor to a data transmission device 4, this command is analyzed by an analyzing part 403, and a frame for the transmission of the emergency command is generated by a frame constituting part 404. The transmission of this emergency command frame is indicated to a transmission control part 412. At this time, the transmission of the command which is processed at present is interrupted, and a temporary interruption status is sent to the other party of communication through a data transmission line 7. Thereafter, the emergency command is taken out from an emergency command transmission register 414 and is transmitted. After this emergency command is transmitted, the command in a command transmission register 413 is transmitted. |
