
Appendix E. Connector Pinouts
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Pin | Name  | I/O  | Description  | 
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20  | DTR  | I  | Data Terminal Ready | 
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22  | RI  | O  | Ring Indicator | 
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  | I = Input O = Output | |
PIN 1
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  | PIN 13  | 
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  | MALE | 
  | PIN 14  | 
  | PIN 25  | 
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  | Figure  | 
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  | Modem Interface | 
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  | Table  | 
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  | Modem Interface  | 
Pin | Name  | I/O  | Description  | 
1  | Shield  | I/O  | Shield for cable  | 
2  | RD  | O  | Received Data  | 
3  | TD  | I  | Transmitted Data  | 
4  | RTS  | O  | Request to Send  | 
5  | CTS  | I  | Clear to Send  | 
7  | SG  | I/O  | Signal Ground  | 
8  | CD  | I  | Carrier Detect  | 
20  | DTR  | O  | Data Terminal Ready  | 
I = Input O = Output
88  | Express XRT User Guide  |