A.13. UART interface

The baseboard provides four serial transceivers.

Figure A.20 shows the pin numbering for the 9-pin D-type male connector used on the baseboard and Table A.23 lists the signal assignment for the connectors.

The pinout shown in Figure A.20 is configured as a Data Communications Equipment (DCE) device.

Figure A.20. Serial connector

Serial connector

Table A.23. Serial plug signal assignment

PinUART0 J40A (top)UART1 J40B (bottom)UART2 J39A (top)UART3 J39B (bottom)
1SER0_DCDNCNCNC
2SER0_RXSER1_RXSER2_RXSER3_RX
3SER0_TXSER1_TXSER2_TXSER3_TX
4SER0_DTRSER1_DTR[a]SER2_DTRaSER3_DTRa
5SER0_GNDSER1_GNDSER2_GNDSER3_GND
6SER0_DSRSER1_DSRaSER2_DSRaSER3_DSRa
7SER0_RTSSER1_RTSSER2_RTSSER3_RTS
8SER0_CTSSER1_CTSSER2_CTSSER3_CTS
9SER0_RINCNCNC

[a] The signals SER1_DTR, SER2_DTR, and SER3_DTR are connected to the corresponding SER1_DSR, SER2_DSR, and SER3_DSR signals. These signals cannot be set or read under program control.


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