Motherboard Express µATX Technical Reference ManualV2M-P1
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A.2. UART interface

The motherboard provides four serial transceivers on the rear panel of the enclosure.

Figure A.2 shows the pin numbering for the 9-pin D-type male connector used on the V2M-P1 and Table A.1 shows the signal assignment for the connectors.

Figure A.2 shows the pinout that is configured as a Data Communications Equipment (DCE) device.

Figure A.2. Serial connector

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Table A.1. Serial plug signal assignment

PinUART0 J24A, topUART1 J24B, bottomUART2 J25A, topUART3 J25B, bottom
1SER0_DCDNCNCNC
2SER0_RXSER1_RXSER2_RXSER3_RX
3SER0_TXSER1_TXSER2_TXSER3_TX
4SER0_DTRSER1_DTR[a]SER2_DTR[a]SER3_DTR[a]
5SER0_GNDSER1_GNDSER2_GNDSER3_GND
6SER0_DSRSER1_DSR[a]SER2_DSR[a]SER3_DSR[a]
7SER0_RTSSER1_RTSSER2_RTSSER3_RTS
8SER0_CTSSER1_CTSSER2_CTSSER3_CTS
9SER0_RINCNCNC

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


Note

Depending on system configuration, UART0 and UART1 are used for remote control, the interface to the MCC, log file output, or Boot Monitor interface. See Chapter 3 Configuration.

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