| 摘要 |
PURPOSE:To select a channel in response to communication object and to improve the operating efficiency by providing a means storing an identification number of a channel usable for each transmission destination of transmission information to a communication controller connected in a loop and using the means to decide the selecting range of the operating communication line. CONSTITUTION:A communication controller 2 is provided with a slot number storage circuit 16 storing an identification number of a usable communication line at each transmission destination of transmission information and a usable slot number (n) is stored corresponding to an incoming address DA of a transmission packet P. The number (n) is transmitted to a comparator circuit 14, which transmits a switching signal to a gate 9 when the incoming slot number and the number (n) are coincident. Since a usable slot S is designated by the storage circuit 16 depending on the added incoming address DA, the idle slot S is selected among lots of slots S in the packet P addressed to a terminal device calling for real time performance and the idle slot S is selected among a few slots S in the packet P addressed to the other device.
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