| 摘要 |
PURPOSE:To obtain tolerance to radio wave trouble by using plural control channels cyclically for control over communication channel. CONSTITUTION:Two channels C2 and C3 which are communication channels are used to control communication channels in addition to a control channel C1. The normal channel C1 and auxiliary control channels C2 and C3 are used cyclically to control the communication channels. A master equipment sends a control channel setting signal through the auxiliary control channel C2 if there is radio wave trouble as to the frequency C1b of the normal control channel C1. This control channel setting signal is generated continuously by the master equipment until the abnormality is removed from the normal control channel C1. |
