
Appendix D: RS-232  Connections
| 
 | 
 | 
 | 
 | 
| Signal | DTE | ||
| Pin | 
 | 
 | 
 | 
| 1 | Carrier Detect | DCD | In | 
| 2 | Receive Data | RXD | In | 
| 3 | Transmit Data | TXD | Out | 
| 4 | Data Terminal Ready | DTR | Out | 
| 5 | Signal Ground | GND | |
| 6 | Data Set Ready | DSR | In | 
| 7 | Request To Send | RTS | Out | 
| 8 | Clear To Send | CTS | In | 
| 9 | Not Connected | NA | NA | 
Figure 16. RS-232  Connections in a DB-9  Connector
| Manual Documentation Number ES1A  | 41 | 
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 
B&B Electronics Ltd – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph +353 
