# Open UART interface, controlling RTS/CTS?

**URL:** <https://forum.sierrawireless.com/t/open-uart-interface-controlling-rts-cts/3552>\
**Category:** Open AT\
**Created:** [August 12, 2009, 10:10am UTC](https://forum.sierrawireless.com/t/open-uart-interface-controlling-rts-cts/3552 "2009-08-12T10:10:45Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![palsson](https://avatars.discourse-cdn.com/v4/letter/p/4af34b/32.png) [@palsson](https://forum.sierrawireless.com/u/palsson)\
**Post date:** [August 12, 2009, 10:10am UTC](https://forum.sierrawireless.com/t/open-uart-interface-controlling-rts-cts/3552/1 "2009-08-12T10:10:45Z")

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Hi

Hardware: Q2687  
Firmware: R74

Need help, using the open UART interface.  
I would like to control the state of the output control signal CT106/CTS2.  
When reading the ADL user guide, I believe it is possible, by setting correct parameters in sUartSettings\_t and others.  
But setting correct parameters is the problem.

I’m connecting a RS485 driver to UART2 and I need to control the receive/transmit with the CTS signal.  
Cannot use GPIO as it is already designed the other way!

Regards  
palsson