Table 8. Db9 Connector Pin Assignment; Figure 8. Db9 Connector - iRZ RU21w User Manual

3.2.4.
DB9 Connector (COM port)
DB9 connector is designed to connect COM port via RS232 interface. For description of connector pins,
see Table 3.5.

Table 8. DB9 Connector Pin Assignment

Pin
1 RS232 - DCD
2 RS232 - RXD
3 RS232 - TXD
4 RS232 - DTR
5
6 RS232 - DSR
7 RS232 - RTS
8 RS232 - CTS
9 RS232 - RI
CAUTION!
Connect devices to the router serial port only when both devices are off.
3.2.5.
Reset Button
The reset button is designed to restore the router's factory settings in case it can not be accessed.
9
5

Figure 8. DB9 connector

Signal
GND
Direction
Device  Router
Device  Router
Router  Device
Router  Device
Ground
Device  Router
Router  Device
Device  Router
Device  Router
6
1
Purpose
Data carrier detect
Receive data
Transmit data
Data terminal ready
Router case
Data set ready
Request to send
Clear to send
Ring indicator
16