| 摘要 |
The system has a rectangular two-way electromagnetic coupling unit (4), outputting pulses that are output to a serial input port (Rx) of a microcontroller (20), to exchange serial data signals between a master electronic device (3) and a slave power meter (2). The microcontroller is programmed so that each pulse received at the port generates a break and bits are generated at serial data transmission speed. Value of each bit is equal to that of the preceding bit or equal to the reciprocal of that of the preceding bit if the breaks are not received and are received in meantime, respectively. The two-way electromagnetic coupling unit is chosen from an inductive type electromagnetic coupling unit or a capacitive type electromagnetic coupling unit. |
