COM端口通常用于連接鼠標(biāo)及通訊�(shè)備(如連接外置�MODEM�(jìn)行數(shù)�(jù)通訊)等�
一塊主板一般帶有兩�(gè)COM串行端口�
COM端口: 一塊主板一般帶有兩�(gè)COM串行端口。通常用于連接鼠標(biāo)及通訊�(shè)備(如連接外置式MODEM�(jìn)行數(shù)�(jù)通訊)等�
一�(tái)PC�(jī)上的COM端口連接器通常�9針公D-shells 接口�
COM針腳定義和RS-232C接口定義(DB9)一�
引腳 定義 符號(hào)
1 載波檢測(cè) DCD(Da[1] ta Carrier Detect�
2 接收�(shù)�(jù) RXD(Received Data�
3 �(fā)送數(shù)�(jù) TXD(Transmit Data�
4 �(shù)�(jù)終端�(zhǔn)備好 DTR(Data Terminal Ready�
5 信號(hào)� SG(Signal Ground�
6 �(shù)�(jù)�(zhǔn)備好 DSR(Data Set Ready�
7 �(qǐng)求發(fā)� RTS(Request To Send�
8 清除�(fā)� CTS(Clear To Send�
9 振鈴提示 RI(Ring Indicator�
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