Wiren Board 4: RS-232 Extension Module

Pinout

The RS-232 signals are output to the terminals of the O1-O3 extension module.

Pinout:

• O1 - GND
• O2 - TX
• O3 - RX

Multiplexing

The RS-232 module is multiplexed with an uninsulated RS-485 port. Their simultaneous operation is not allowed

Configuration

To work with RS-232, the Wiren Board kernel must be configured in a specific way.

In the

 /boot/uEnv.txt   

file

you need to replace the line

fdt_file=/boot/dtbs/imx23-wirenboard41.dtb

with

fdt_file=/boot/dtbs/imx23-wirenboard41-rs232.dtb

and reboot controller by command

reboot

See 1 and SSH/en .

Operation

The port is available in the system as

/dev/ttyNSC1