| 摘要 |
PURPOSE:To attain the effective use of a data processor by providing a work/ work-stop control circuit and a gate circuit to a printer and using an internal printer and an external device as the serial ports for data communication. CONSTITUTION:A printer controller 2 receives data at a PRT-RD terminal from a microcomputer 1 after setting a PRT-OFF terminal at 'L' (work) and discriminates whether the received data is equal to the request data for stop of working or not. When the received data is not equal to the request data, the received data is processed. While the PRT-OFF terminal is set at 'H' when said received data is equal to the working request data. Then it is discriminates whether the subsequent received data is equal to the working stop request data or not. When no coincidence is obtained between both data, the received data is neglected to perform no processing (working stop state). While the PRT-OFF terminal is reset to 'L' when the coincidence is obtained between said both data. Therefore the signal is delivered to outside from the computer 1 only when the controller 2 is inactive.
|
