# CME9210: RS485

**URL:** <https://forums.digi.com/t/cme9210-rs485/6135>\
**Category:** Linux\
**Created:** [January 5, 2010, 10:51am UTC](https://forums.digi.com/t/cme9210-rs485/6135 "2010-01-05T10:51:19Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![mrib](https://avatars.discourse-cdn.com/v4/letter/m/e19adc/32.png) [@mrib](https://forums.digi.com/u/mrib)\
**Post date:** [January 5, 2010, 10:51am UTC](https://forums.digi.com/t/cme9210-rs485/6135/1 "2010-01-05T10:51:19Z")

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Hi everybody,

This topic came up several times but up to now nobody seems to have a solution for the CME9210 with Linux.

In DigiEL 5.1 it’s possible in kernel configuration to use UART A in “RXTX485” Mode.

What else has to be done (tcsetattr() or ioctl()) that RTS drives the output enable of the rs485 transceiver by HW?

Any sample code would be great.

Thanks,  
-mrib