# \[Hilo\] Why we fail to use FTP/TCP when setting 7 bit UART?

**URL:** <https://forum.sierrawireless.com/t/hilo-why-we-fail-to-use-ftp-tcp-when-setting-7-bit-uart/6564>\
**Category:** HL Series FAQ\
**Created:** [July 23, 2013, 6:16am UTC](https://forum.sierrawireless.com/t/hilo-why-we-fail-to-use-ftp-tcp-when-setting-7-bit-uart/6564 "2013-07-23T06:16:45Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![FAQ\_Poster](https://avatars.discourse-cdn.com/v4/letter/f/f9ae1b/32.png) [@FAQ\_Poster](https://forum.sierrawireless.com/u/FAQ_Poster)\
**Post date:** [July 23, 2013, 6:16am UTC](https://forum.sierrawireless.com/t/hilo-why-we-fail-to-use-ftp-tcp-when-setting-7-bit-uart/6564/1 "2013-07-23T06:16:45Z")

</div>

Answer: With UART 7-bit mode (AT+KUART=7), the range of a single byte is from 0 to 127. That’s the limitation for data transferred in TCP/FTP.