资料介绍
例：
Serial (PC 9)
(At the Computer)
9 PIN D-SUB MALE at the Computer.
PinNameDirDescription
1CDCarrier Detect
2RXDReceive Data
3TXDTransmit Data
4DTRData Terminal Ready
5GNDSystem Ground
6DSRData Set Ready
7RTSRequest to Send
8CTSClear to Send
9RIRing Indicator
Information from The Hardware Book
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