# I have connected a Serial to USB converter to a Xbee Series 2. Its not able to write configuration to it from XCTU

**URL:** <https://forums.digi.com/t/i-have-connected-a-serial-to-usb-converter-to-a-xbee-series-2-its-not-able-to-write-configuration-to-it-from-xctu/16380>\
**Category:** XBee & XBee Gateway\
**Tags:** usb-to-serial, series-2, dtr, xbee\
**Created:** [March 4, 2016, 11:23am UTC](https://forums.digi.com/t/i-have-connected-a-serial-to-usb-converter-to-a-xbee-series-2-its-not-able-to-write-configuration-to-it-from-xctu/16380 "2016-03-04T11:23:32Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Ajith](https://avatars.discourse-cdn.com/v4/letter/a/bcef8e/32.png) [@Ajith](https://forums.digi.com/u/Ajith)\
**Post date:** [March 4, 2016, 11:23am UTC](https://forums.digi.com/t/i-have-connected-a-serial-to-usb-converter-to-a-xbee-series-2-its-not-able-to-write-configuration-to-it-from-xctu/16380/1 "2016-03-04T11:23:32Z")

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I have connected the VCC, RX, TX, DTR and GND pins to the pins on USB to serial converter Silicon Labs CP210x.

I am able to read the Xbee , update its firmware to Xbee End Device API. But when i try to write settings to it most of the time its not working.

At the Same time when i connect Xbee Series 1 I face no such problem.

When I checked the data sheet of Series 2 and Series 1 i found PIN 9 is DTR active high for Series 1 and DTR active low for Series 2. Could it be the problem.

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**Author:** ![Ajith](https://avatars.discourse-cdn.com/v4/letter/a/bcef8e/32.png) [@Ajith](https://forums.digi.com/u/Ajith)\
**Post date:** [March 5, 2016, 11:41pm UTC](https://forums.digi.com/t/i-have-connected-a-serial-to-usb-converter-to-a-xbee-series-2-its-not-able-to-write-configuration-to-it-from-xctu/16380/2 "2016-03-05T23:41:20Z")

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Note that i am working the xbee from the 3.3 supply that it get from the usb to serial circuit using the Silicon Labs CP210x converter.

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**Author:** ![mvut](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.digi.com/mvut/32/31_2.png) [@mvut](https://forums.digi.com/u/mvut)\
**Post date:** [March 7, 2016, 9:21am UTC](https://forums.digi.com/t/i-have-connected-a-serial-to-usb-converter-to-a-xbee-series-2-its-not-able-to-write-configuration-to-it-from-xctu/16380/3 "2016-03-07T09:21:12Z")

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Yes that is part of it. You also need to use hardware flow control (/CTS) as an End device sleeps by nature and will before you can start writing the settings to it.