# Setting serial port mode RS232/RS485 in c program **URL:** \ **Category:** Hardware and Linux\ **Tags:** pfc200, linux\ **Created:** [January 12, 2024, 10:11am UTC](https://www.wago.community/t/setting-serial-port-mode-rs232-rs485-in-c-program/742 "2024-01-12T10:11:33Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![EdeVee](https://avatars.discourse-cdn.com/v4/letter/e/51bf81/32.png) [@EdeVee](https://www.wago.community/u/EdeVee)\ **Post date:** [January 12, 2024, 10:11am UTC](https://www.wago.community/t/setting-serial-port-mode-rs232-rs485-in-c-program/742/1 "2024-01-12T10:11:33Z")
Hello, We have a WAGO 750-8214 and i’m programming a serial port application. I have not yet been able to find a way to set and get the serial port mode (RS232/RS485) from a c++/c program. Does anybody know where i can find information about this subject? ---
**Author:** ![WagoKurt](https://sea2.discourse-cdn.com/flex016/user_avatar/www.wago.community/wagokurt/32/11_2.png) [@WagoKurt](https://www.wago.community/u/WagoKurt)\ **Post date:** [January 13, 2024, 10:12pm UTC](https://www.wago.community/t/setting-serial-port-mode-rs232-rs485-in-c-program/742/2 "2024-01-13T22:12:12Z")
Hello, You might have a look at this thread. One option is calling the script from your C program. > [@How To: Using PFC200 Onboard Serial Port with Node-RED](https://www.wago.community/t/how-to-using-pfc200-onboard-serial-port-with-node-red/68/2): > > To change the serial port mode you can use the command line tool found in /etc/config-tools directory called set\_serial\_mode. cd /etc/config-tools/ To use RS485 (default): ./set\_serial\_mode rs485 To use RS232: ./set\_serial\_mode rs232 [image] ---
**Author:** ![EdeVee](https://avatars.discourse-cdn.com/v4/letter/e/51bf81/32.png) [@EdeVee](https://www.wago.community/u/EdeVee)\ **Post date:** [January 15, 2024, 8:00am UTC](https://www.wago.community/t/setting-serial-port-mode-rs232-rs485-in-c-program/742/3 "2024-01-15T08:00:59Z")
Thank you, that is an option. I will have a look at it… 😃