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=== UART3 - J28 ===
J28 is a standard DB9 connector for the RS232 two-wires UART3 port. The following table reports the connector's pinout:
{| class="wikitable"
|-
!Pin#
!Pin name
!Function
!Notes
|-
|1, 4, 6, 9
|N.C.
|N.C.
|
|-
|2
|UART_EXT_RX
|Receive line
|Connected to protection diode array
|-
|3
|UART_EXT_TX
|Transmit line
|Connected to protection diode array
|-
|5
|DGND
|Ground
|
|-
|7
|UART_EXT_RTS
|UART3 RTS
| -
|-
|8
|UART_EXT_CTS
|UART3 CTS
| -
→UART3 - J28
|-
|6, 7, 8, 9 ||USB_OTG_SHIELD || Shield to Ground || -
|-
|}
