A. 終端( DTE <-> DCE )與DCA適配器的連接情況：
九針 二十五針 二十五針
1 1 Ground 1 Freme Ground
3 2 Transmitted Data 2 Transmit Data
2 3 Received Data 3 Receive Data
7 4 Request To Sand 4 Requenst To Sand
8 5 Clear To Sand 5 Clear To Sand
6 6 Data Set Ready 6 Data Set Ready
5 7 Signal Ground 7 Signal Ground
4 20 Data Terminal Ready 20 Data Terminal Ready
B.終端( DTE <-> DTE )與CPU前串口(COM1&COM2)的連接情況：
九針 二十五針 二十五針 九針
1 1 Ground 1 Ground
3 2 Transmitted Data 3 Receive Data 2
2 3 Received Data 2 Transmit Data 3
7 4 Request To Sand 5 Clear To Sand 8
8 5 Clear To Sand 4 Request To Sand 7
6 6 Data Set Ready 20 Data Terminal Ready 4
5 7 Signal Ground 7 Signal Ground 5
4 20 Data Terminal Ready 6 Data Set Ready 6
C. PC 機九針和二十五針轉換情況：
九 針 2 3 4 5 6 7 8
二十五針 3 2 20 7 6 4 5
D. PC 和 DCA （DTE <-> DCE)連接情況：
PC 九針 2 3 4 5 6 7 8
DCA 二十五針 3 2 20 7 6 4 5
E. pc(25) & xcpu uart port(9)連接情況：
二十五針 TXD RTD DSR SG DTR CTS RTS
2 3 6 7 20 5 4
九 針 2 3 4 5 6 7 8
RXD TXD DTR SG DSR RTS CTS
F. pc(9) & xcpu uart port(9)連接情況：
九 針 TXD RTD DSR SG DTR CTS RTS
3 2 6 5 4 8 7
九 針 2 3 4 5 6 7 8
RXD TXD DTR SG DSR RTS CTS
G. MODEM ( DCE <-> DCE )與DCA連接情況：
九針 二十五針 二十五針
1 1 Ground 1 Frame Ground
3 2 Transmitted Data 3 Receive Data
2 3 Received Data 2 Transmit Data
7 4 Request To Sand 5 Clear To Sand
8 5 Clear To Sand 4 Request To Sand
6 6 Data Set Ready 20 Data Terminal Ready
5 7 Signal Ground 7 Signal Ground
4 20 Data Terminal Ready 6 Data Set Ready
H. 終端 ( DTE <-> DCE ) 與MODE連接情況：
九針 二十五針 二十五針 九針
1 1 Ground 1 Freme Ground 1
3 2 Transmitted Data 2 Transmit Data 3
2 3 Received Data 3 Receive Data 2
7 4 Request To Sand 4 Requenst To Sand 7
8 5 Clear To Sand 5 Clear To Sand 8
6 6 Data Set Ready 6 Data Set Ready 6
5 7 Signal Ground 7 Signal Ground 5
4 20 Data Terminal Ready 20 Data Terminal Ready 4
