| Signal |
| Signal Description | |
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| Serial output. This signal sends serial data to the communication link. The signal is |
| TxD |
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| set to a marking state on hardware reset when the transmitter is empty or when |
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| loop mode operation is initiated. |
| RxD | Serial input. This signal receives serial data from the communication link. | ||
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| DTR |
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| Data Terminal Ready. This signal indicates to the modem or data set that the |
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| DSR |
| Data Set Ready. This signal indicates that the modem or data set is ready to | |
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| establish a communication link. | ||
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| RTS |
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| Request To Send. This signal indicates to the modem or data set that the |
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| UART is ready to exchange data. | |
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| CTS |
| Clear To Send. This signal indicates that the modem or data set is ready to | |
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| exchange data. | ||
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| DCD |
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| Data Carrier Detect. This signal indicates that the modem or data set has detected |
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| the data carrier. | |
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| RI |
| Ring Indicator. This signal indicates that the modem has received a telephone | |
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| ringing signal. | ||
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| Signal | PIN | PIN |
| Signal |
| GND | 10 | 9 |
| RI |
| CTS | 8 | 7 |
| RTS |
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| DSR | 6 | 5 |
| GND |
| DRT | 4 | 3 |
| TxD |
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| RxD | 2 | 1 |
| DCD |
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