| 摘要 |
PURPOSE:To prevent messages outputted from plural host computers from mutual interference by installing a front end processor FEP between the plural host computers and a common terminal. CONSTITUTION:A front end processor FEP is installed between plural host computers HC1 and HC2 and a common terminal controller TC. The TC controls a display DISP and a printer PR. When the host computer HC1 generates a transmission request to communicate with the printer PR, the FEP receives the request and, after checking that the other computer is not being in communication with the PR, sends a signal of reception OK to the HC1. When receiving the signal of reception OK, the HC1 sends the 1st block of a message to the PR. The PR prints out the received 1st block and, after finishing the printing, sends output completion information to the HC1. From the point of time, the FEP starts monitoring for a longer time than the time interval in blocking the message. When receiving a transmission request from the host computer HC2 during the monitoring, the FEP sends back reception disable NG to the HC2, preventing the mutual interference of messages outputted from HC1 and HC2. |
