| 摘要 |
A data communication method, a communication device, and a communication system are disclosed. The method includes: a master device is connected, through the first RS485/RS422 port and the second RS485/RS422 port of the master device, to the at least two slave devices by using an RS485/RS422 bus loop, and when transmitting the data from the first RS485/RS422 port of the master device to the slave device connected to the master device through the first RS485/RS422 port of the master device, the master device activates the data transmission function on the first RS485/RS422 port of the master device while inactivates the data transmission function on the second RS485/RS422 port of the master device; and when a line interruption is detected, inactivating the data transmission function on the first RS485/RS422 port of the master device, and activating the data transmission function on the second RS485/RS422 port of the master device.
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