User’s Manual
3.11.15Serial Port 1 / Serial Port 2 with External DB9 Connector (J9, J12)
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| Signal | PIN | Signal |
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| GND | 5 |
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| 9 | RI |
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| DTR | 4 |
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| 8 | CTS |
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| TxD | 3 |
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| 7 | RTS |
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| RxD | 2 |
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| 6 | DSR |
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| DCD | 1 |
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3.11.16Signal Description – Serial Port 1 / Serial Port 2 in
TxD | Serial output. This signal sends serial data to the communication link. The signal is set to a |
| marking state on hardware reset when the transmitter is empty or when loop mode operation |
| is initiated. |
RxD | Serial input. This signal receives serial data from the communication link. |
DTR | Data Terminal Ready. This signal indicates to the modem or data set that the |
| is ready to establish a communication link. |
DSR | Data Set Ready. This signal indicates that the modem or data set is ready to establish a |
| communication link. |
RTS | Request To Send. This signal indicates to the modem or data set that the |
| ready to exchange data. |
CTS | Clear To Send. This signal indicates that the modem or data set is ready to exchange data. |
DCD | Data Carrier Detect. This signal indicates that the modem or data set has detected the data |
| carrier. |
RI | Ring Indicator. This signal indicates that the modem has received a telephone ringing signal. |
