# SL80802t and a 8 wire UART

**URL:** <https://forum.sierrawireless.com/t/sl80802t-and-a-8-wire-uart/7638>\
**Category:** Legacy AirPrime modules\
**Created:** [December 23, 2014, 7:13am UTC](https://forum.sierrawireless.com/t/sl80802t-and-a-8-wire-uart/7638 "2014-12-23T07:13:04Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![profort](https://avatars.discourse-cdn.com/v4/letter/p/ba8739/32.png) [@profort](https://forum.sierrawireless.com/u/profort)\
**Post date:** [December 23, 2014, 7:13am UTC](https://forum.sierrawireless.com/t/sl80802t-and-a-8-wire-uart/7638/1 "2014-12-23T07:13:04Z")

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What is the status for 8 wire UART.

At the AirPrime\_SL808xT\_SL808xBT\_and\_SL808xBTA\_Product\_Technical\_Specification\_and\_Customer\_Design\_Guidelines\_Rev3\_2.pdf could I read follow.

For the list of AT commands needed to configure the UART, refer to sections 6 Global Configuration  
Commands and 8 Serial Port Commands of document [2] AT Commands Interface Guide for  
Firmware 7.52/7.53.

In the “AT Commands Interface Guide for Firmware 7.52 - Rev6.0.pdf” I could not find any infomation about the 8-wire UART.

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**Author:** ![Rex\_alex](https://avatars.discourse-cdn.com/v4/letter/r/73ab20/32.png) [@Rex\_alex](https://forum.sierrawireless.com/u/Rex_alex)\
**Post date:** [December 24, 2014, 9:32am UTC](https://forum.sierrawireless.com/t/sl80802t-and-a-8-wire-uart/7638/2 "2014-12-24T09:32:36Z")

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Hi,  
I have also gone through the PTS and yes, it looks like SL8082T supports 8-wire UART. May be in the latest FW versions…  
Will check internally and will update to you. Meanwhile you can have a look at the latest FW release notes…….

Thanks,  
Rex

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**Author:** ![profort](https://avatars.discourse-cdn.com/v4/letter/p/ba8739/32.png) [@profort](https://forum.sierrawireless.com/u/profort)\
**Post date:** [December 29, 2014, 7:21am UTC](https://forum.sierrawireless.com/t/sl80802t-and-a-8-wire-uart/7638/3 "2014-12-29T07:21:10Z")

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I look forward to hear from you. I should use 8-wire Uart in a sleep Routine (w32k=1). Therefore it will be important to use the DTR.

Bjarne

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**Author:** ![sushil](https://avatars.discourse-cdn.com/v4/letter/s/e19adc/32.png) [@sushil](https://forum.sierrawireless.com/u/sushil)\
**Post date:** [December 30, 2014, 7:17am UTC](https://forum.sierrawireless.com/t/sl80802t-and-a-8-wire-uart/7638/4 "2014-12-30T07:17:35Z")

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8-wire UART is supported on Firmware 7.53 (still under development in SWIR). It is not available on 7.52.  
AT Cmd manual for 7.53 has AT+WHCNF=8 AT command to activate/deactivate 8-wire UART.

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**Author:** ![profort](https://avatars.discourse-cdn.com/v4/letter/p/ba8739/32.png) [@profort](https://forum.sierrawireless.com/u/profort)\
**Post date:** [December 30, 2014, 9:29am UTC](https://forum.sierrawireless.com/t/sl80802t-and-a-8-wire-uart/7638/5 "2014-12-30T09:29:03Z")

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Thanks for the answer.

When will the firmware 7.53 coming?

Bjarne.

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**Author:** ![sushil](https://avatars.discourse-cdn.com/v4/letter/s/e19adc/32.png) [@sushil](https://forum.sierrawireless.com/u/sushil)\
**Post date:** [January 5, 2015, 9:07am UTC](https://forum.sierrawireless.com/t/sl80802t-and-a-8-wire-uart/7638/6 "2015-01-05T09:07:55Z")

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As far as I know, it should be available by end Q1 2015.

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**Author:** ![profort](https://avatars.discourse-cdn.com/v4/letter/p/ba8739/32.png) [@profort](https://forum.sierrawireless.com/u/profort)\
**Post date:** [April 20, 2015, 7:52am UTC](https://forum.sierrawireless.com/t/sl80802t-and-a-8-wire-uart/7638/7 "2015-04-20T07:52:50Z")

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When will the Firmware 7.53 comes. Now we are in start of Q2 2015.