| 摘要 |
PURPOSE:To decrease probability of mis-discrimination of data duplicate incom ing by providing a detour mode flag and a serial number in a transmission data and allowing a transmission/reception transmission controller to apply dissidence discrimination between the data and the preceding reception data of the detour mode flag and the serial number. CONSTITUTION:Four couples of transmission controllers 120, 130, - 123, 133 and host devices 150-153 connected respectively to them are provided, and the four coupled of transmission controllers are connected respectively with the transmission lines 140-143 to constitute a detour. A transmission data consists of an opening flag 200, an address 201, a control 202, an information 203, a frame check sequence 204 and a closing flag 205, and the control section is provided with a detour flag 300, a detour mode flag 301 and a serial number 302. The flag 300 discriminates whether or not the sent data at the preceding reception is detoured at the own sent data transmission, and a flag 301 is set at detour for transmission. The flag 301 and the serial number 302 are discriminates at incoming so as to reduce the data duplicate incoming.
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