| 摘要 |
<p>PURPOSE:To surely execute the switching by detecting an abnormality at both sides, executing the switching and surely executing the switching when only one side direction between the interfaces of both devices duplicated for the present use and the preliminary use is different. CONSTITUTION:A receiving switching control part 20 controls a present use interface 3-1 and a preliminary use interface 3-2, transmitting data with a control signal C as a code '0' are sent to an opponent device 1, a transmitting switching control part 10 of the device 1 detects that the control signal C in the receiving data is a code '0', and the transmitting data inputted to the device 1 are switched and transmitted from the present use side interface 3-1 to the preliminary use side interface 3-2. The device 2 receives the data with the preliminary use interface 3-2, the receiving switching control part 20 detects that the control signal C of the receiving data is a code '0', the receiving output edge switched to a preliminary side earlier is held as it is, and the receiving data received by the preliminary interface 3-2 are outputted to the external part. Thus, a correct switching is executed.</p> |
