
The signals are assigned to the interface pins of the
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 |
14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 |
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| Signal | Pin No. | Signal |
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Item | Function | ||||
Name | Direction | ||||
| 25 pin |
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Transmitted data | TD | 2 | DTE→DCE | Used for transmitted data. | |
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Received data | RD | 3 | DTE←DCE | Used for received data. | |
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Request to send | RTS | 4 | DTE→DCE | Signal for data transmission request from | |
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| your PC (DTE) to the modem (DCE). | |
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| Also used for flow control. | |
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Clear to send | CTS | 5 | DTE←DCE | Signal for the modem to permit data | |
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| transmission from your PC (DTE) to the | |
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| modem (DCE). Also used for flow control. | |
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Data set ready | DSR | 6 | DTE←DCE | Signal which shows the status when the | |
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| modem is available for transmission and | |
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| reception. | |
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Signal GND | SG | 7 | DTE↔DCE | Signal ground. | |
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Carrier detect | CD | 8 | DTE←DCE | Carrier detect signal. | |
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Data terminal ready | DTR | 20 | DTE→DCE | Signal which shows the status when your | |
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| PC is available for communication. | |
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Ring indicator | RI | 22 | DTE←DCE | Sends the signal according to the request | |
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| signal. | |
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GND | FG | 1 | DTE↔DCE | Frame ground. | |
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