| 摘要 |
<p>PURPOSE:To attain communication between optional OA equipments with a very simple transmission protocol by providing a same transmitter receiver having 1st and 2nd frequencies F1, F2 to all OA equipments and providing a function inverting a transmission frequency and a reception frequency. CONSTITUTION:Transmitters of personal computers 1a, 1b and a printer 2 are in standby of a frequency F1 and receivers are in standby of a frequency F2. When the personal computer 1a is connected to the printer 2 to allow it to make print, the transmitter sends a call signal S1 in the frequency F2 to the personal computer 1b and the printer 2. The printer 2 receives the signal S1 and sends the call reply S2. The personal computer 1a receives the reply S2, outputs print information S3 to the printer 2, the printer 2 executes the print of the information S3 and an end signal S4 is sent to the personal computer 1b and the printer 2 at the end point.</p> |
