| 摘要 |
PROBLEM TO BE SOLVED: To use a communication function between a management device and a device under management more. SOLUTION: A communication system in which the management device CU and the device RC under the management of the management device CU are connected together through a signal line 3 for communication and communicate with each other with digital signals is configured to use the same signal line in common for both a digital signal sent from the management device CU to the device RC under its management and a digital signal sent from the device RC under the management to the management device CU, the digital signal sent from the management device CU to the device RC under the management and the digital signal sent from the device RC under the management to the management device CU being set to different signal levels. COPYRIGHT: (C)2008,JPO&INPIT
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