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从理论方面给出了链式拓扑结构RS422总线接口电路总负载阻抗计算方法;从试验方面测试分析了当某接收端短路失效时,驱动芯片和其他接收端的通信质量。试验证明,只要保证总负载阻抗R_L不小于90欧姆,某接收端短路失效并不会影响驱动芯片和其他接收端的正常通信,试验结果与理论分析一致。
The method of calculating the total load impedance of RS422 bus interface circuit is given theoretically. The test and analysis of the communication quality of the driver chip and other receiver when a receiver short-circuit fails is given. The test proves that, as long as the total load impedance R_L is guaranteed to be not less than 90 ohms, the short-circuit failure at a receiver does not affect the normal communication between the driver chip and other receivers. The test results are consistent with the theoretical analysis.