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.
Table A.23. Serial plug signal assignment
| Pin | UART0 J40A (top) | UART1 J40B (bottom) | UART2 J39A (top) | UART3 J39B (bottom) |
|---|---|---|---|---|
| 1 | SER0_DCD | NC | NC | NC |
| 2 | SER0_RX | SER1_RX | SER2_RX | SER3_RX |
| 3 | SER0_TX | SER1_TX | SER2_TX | SER3_TX |
| 4 | SER0_DTR | SER1_DTR[a] | SER2_DTRa | SER3_DTRa |
| 5 | SER0_GND | SER1_GND | SER2_GND | SER3_GND |
| 6 | SER0_DSR | SER1_DSRa | SER2_DSRa | SER3_DSRa |
| 7 | SER0_RTS | SER1_RTS | SER2_RTS | SER3_RTS |
| 8 | SER0_CTS | SER1_CTS | SER2_CTS | SER3_CTS |
| 9 | SER0_RI | NC | NC | NC |
[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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