5.4 How to connect a RS485 serial port
In this chapter is shown how an RS485 serial port can be connected to the module. In the figure below is shown 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 4
The pins involved in this RS485 communication example are listed in the following table.
Number
Name
Primary Function
Description
GPIO
Capable
Voltage
105
UART8_CTS
UART8 CTS signal
Y
+3,3V
106
UART8_RTS
UART8 RTS signal
Y
+3,3V
108
UART8_TXD
UART8 TXD signal
Y
+3,3V
109
UART8_RXD
UART8 RXD signal
Y
+3,3V
Table 11
D N :
2 4
