Manual
Distribution Amplifier (DA)—User Manual 
18 
6.6 Ports and Switchers 
The Distribution Amplifier (DA) provides standard RS-232 and RS-485 serial 
communication ports. Use the RS-232 or RS-485 serial communication port to carry out 
remote operation. 
6.6.1 RS-232 
The RS-232 Pin functions are described as below: 
Pin No.  Abbreviation  Description 
1 N/u Null 
2 TXD Send 
3 RXD Receive 
4 N/u Null 
5 GND Ground 
6 N/u Null 
7 N/u Null 
8 N/u Null 
9 N/u Null 
Figure 6-11 (a) RS-232 – From Female DB9 (PC) to Male DB9 (DA) 










