5.8.6 Serial Port RS232
The DB9 Female connector is used for this interface.
Pin
Signal mark
1
DCD
2
RXD
3
TXD
4
DTR
5
GND
6
DSR
7
RTS
8
CTS
9
RI
Description
Data Carrier Detect
Receive Data
Transmit Data
Data Terminal Ready
System Ground
Data Set Ready
Request to Send
Clear to Send
Ring Indicator
Table 9: Connection of RS232 connector
Figure 19: RS232 connector
21
5. ROUTER DESIGN
Data flow direction
Output
Output
Input
Input
—
Output
Input
Output
NC