| 摘要 |
PROBLEM TO BE SOLVED: To obtain an order entry system which enables a control application to be started by a unit other than a controller and can print a slip in case of radio trouble or controller trouble. SOLUTION: Output terminals 5, 6, and 11 by SS radio are provided. A wired output terminal and the radio output terminals are provided and even in case of radio trouble, a slip is outputted to the wired output terminal. An SS radio output terminal measures the electric field intensity of radio equipment of radio repeaters 3, 7, and 8 to select the best radio repeater. If a periodic disturbing wave is generated in SS radio communication, transfer with packet length shorter than cycles is performed to evade the communication disturbance. When the same information from input terminals 4 and 10 is received from radio the repeaters 3, 7, and 8, the information is discarded except information received for the 1st time. |
