| 摘要 |
PURPOSE:To omit useless communication and to improve the communication efficiency by allowing a radio equipment to send an open path signal to a fixed station with a signal output control means when the line open operation of a manual switch is detected so as to keep a self-hold switch 4 in the closing state. CONSTITUTION:The processing operation of a CPU 12 implemented at the halt state of fork lifts 2A-2C is explained. When the CPU 12 detects it that an electric potential at a connecting point (d) is lower through the turning-off of a key switch 19 to stop the operation of the fork lifts 2A-2C in operation, whether or not communication in a radio wave is implemented between a radio MODEM 9 of a host computer 11 and a radio equipment 3 of a terminal equipment 4 is discriminated. When the CPU 12 discriminates the communication regardless of the OFF operation of the key switch 19, a contact 22 is kept in the closing state. As a result, the relay contact 21 is kept self-hold and power supply to the radio equipment 3 and the terminal equipment 4 is implemented continuously and the continuity of communication is attained. The CPU 12 awaits the end of communication between the MODEM 9 and the radio equipment 3. |
