2.4.16Serial Port 2 Connector in
| Signal |
| PIN | PIN |
| Signal |
| DCD2 |
| 11 | 12 |
| DSR2 |
| RxD2 | 13 | 14 |
| RTS2 | |
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| TxD2 |
| 15 | 16 |
| CTS2 |
| DTR2 | 17 | 18 | RI2/+5V/+12V | ||
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| GND |
| 19 | 20 |
| NC |
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2.4.16.1Signal Description – Serial Port 2 Connector in
| Signal |
| Signal Description |
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| Serial output. This signal sends serial data to the communication link. The signal is |
| TxD |
| 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 |
| 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 |
| 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 |
| 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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