5.4 How to connect a RS485 serial port
This chapter is shows how an RS485 serial port can be connected to the module. The figure below shows how UART3 is used to
connect to a RS485 transceiver on the starter kit. The figure shows UART3 connection but you can consider that also UART 4 & 5 can
be used to connect a RS485 transceiver.
Figure 5
The pins involved in this RS485 communication example are listed in the following table.
A Connector
Name
Primary Function Description
CPU Pin Name
GPIO Capable Voltage
71
UART2 CTS
UART2 CTS signal Output
UART2 CTS
Y
+3,3V
69
UART2 RTS
UART2 RTS signal Input
UART2 RTS
Y
+3,3V
67
UART2 TXD
UART2 TXD signal Output
UART2 TX_DATA
Y
+3,3V
65
UART2 RXD
UART2 RXD signal Input
UART2 RX_DATA
Y
+3,3V
Table 9
D N :
2 4