Rs232/Uart - OLIMEX PIC32-MAXI-WEB User Manual

Pin # Signal name
1 RSTN
2 3.3V
3 GND
4 PGED2
5 PGEC2
6 NC
PGED2 conducts I/O operations for the "Program Data" signal. Serial data for programming.
PGEC2 serves only as input for the "Program Clock" signal. Clock used for transferring the serial
data (output from ICSP, input for the MCU).

5.3.3 RS232/UART

Pin # Signal name
1 PC_CD
2 PC_RXD
3 PC_TXD
4 NC
5 GND
6 NC
7 PC_RTS
8 PC_CTS
9 NC
TXD is an output. It is the "Transmit Data" signal which is the asynchronous serial data output
(RS232) for the shift register on the UART controller.
RXD is an input. It is the "Receive Data" signal which is the asynchronous serial data input
(RS232) for the shift register on the UART controller.
The demo software uses RS232 so it would display your IP address on a PC terminal program (at
115200 baud) when the board is connected to a PC and has a valid Ethernet source connected.
5.3.4 USB_OTG
Pin # Signal name
1 +5V_VBUS
2 USB_D-
3 USB_D+
4 USBID
5 GND
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