| 摘要 |
A circuit of a serial communication (COM) port pair is disclosed, in which a first and a second serial COM ports and an isolation module are provided, wherein the first and second serial COM ports are arranged at a first and a second devices respectively and the isolation module is arranged between the first and second COM ports and is provided with a power supply by acquiring a signal at a DTR pin and a signal at a TXD pin of the serial COM port of the first device when the first and second devices are ready for data transmission there between in a handshake.
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