
Table 
Serial Interfaces
Connector and Icon
1 2 3 4 5
6 7 8 9
| Pin | 
 | Signal | 
| 1 | 
 | Carrier detect | 
| 2 | 
 | Receive data | 
| 3 | 
 | Transmit data | 
| 4 | 
 | Data terminal ready | 
| 5 | 
 | Signal ground | 
| 6 | 
 | Data set ready | 
| 7 | 
 | Request to send | 
| 8 | 
 | Clear to send | 
| 9 | 
 | Ring indicator | 
| 
 | 
 | 
 | 
Compaq Professional Workstation AP500 Maintenance and Service Guide
