PC 串行口定義

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PC/AT 機上的(de)串行口是 9 針公插座，引腳定義爲：

9 PIN D-SUB MALE

Pin Name Dir Description
1 CD <-- Carrier Detect
2 RXD <-- Receive Data
3 TXD --> Transmit Data
4 DTR --> Data Terminal Ready
5 GND --- System Ground
6 DSR <-- Data Set Ready
7 RTS --> Request to Send
8 CTS <-- Clear to Send
9 RI <-- Ring Indicator

PC/XT 機上的(de)串行口是 25 針公插座，引腳定義爲：

25 PIN D-SUB MALE

Pin Name Dir Description
1 SHIELD - Shield Ground
2 TXD --> Transmit Data
3 RXD <-- Receive Data
4 RTS --> Request to Send
5 CTS <-- Clear to Send
6 DSR <-- Data Set Ready
7 GND - System Ground
8 CD <-- Carrier Detect
9 n/c - 　
10 n/c - 　
11 n/c - 　
12 n/c - 　
13 n/c - 　
14 n/c - 　
15 n/c - 　
16 n/c - 　
17 n/c - 　
18 n/c - 　
19 n/c - 　
20 DTR --> Data Terminal Ready
21 n/c - 　
22 RI <-- Ring Indicator
23 n/c - 　
24 n/c - 　
25 n/c -