| 摘要 |
PURPOSE:To attain data communication between data communication equipments even if the number of stations exceeds 254 by transmitting a random number between its own station and an opposite station to each other in a frame of global address, and adding a procedure deciding each station address depending on the largeness of the number. CONSTITUTION:When both stations A, B are in phase P1, that is, in the data link interrupting state, each station transmits a random number generated in advance by using global address frames 3, 4 and in receiving the frame of the global address of the opposite station, the random number of its own station and the opposite station is compared. In such a case, the larger random number is selected to be an address a1 and the smaller random number is selected to be an address a2, then the address of both the stations is decided. Thus, it is not required to feed a station address in advance to each data communication equipment, and every if the number of stations exceeds 254, the data link is established between optional data communication equipments to transmit/ receive the data.
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