| 摘要 |
A plurality of devices are operated by storing at a device a first ID number received at a first port of the device and a second ID number received at a second port of the device. The device receives a data command through at least one of the first and second ports. The data command has a command ID number. The device executes the data command when at least one of the command ID number is equal to the first ID number when the data command is received at the first port and the command ID number is equal to the second ID number when the data command is received at the second port.
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