| 摘要 |
PROBLEM TO BE SOLVED: To ensure the transmission and reception of control data even in the case where CAN communication is impossible in a CAN controller unit system. SOLUTION: CAN controller units C1, C2, C3, C4 and C5 are linked to each other through a CAN communication bus 82a. In a normal communication state (S7: yes), CAN communication is performed via a CAN controller 12. On the other hand, a communication line 82b is parallelly placed, and a communication state is checked (S10) by idling communication through a communication means of a serial interface, RS232C. By any chance, the CAN communication becomes impossible (S9: error off state), the error information and the minimum control data for controlling the agricultural equipment are transmitted with the RS232C communication means via the communication line 82b (S11).
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