# Simultaneous transmission does work ?

**URL:** <https://forums.digi.com/t/simultaneous-transmission-does-work/1594>\
**Category:** XBee - 802.15.4\
**Created:** [November 9, 2010, 10:08am UTC](https://forums.digi.com/t/simultaneous-transmission-does-work/1594 "2010-11-09T10:08:13Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![shuichiy](https://avatars.discourse-cdn.com/v4/letter/s/ee59a6/32.png) [@shuichiy](https://forums.digi.com/u/shuichiy)\
**Post date:** [November 9, 2010, 10:08am UTC](https://forums.digi.com/t/simultaneous-transmission-does-work/1594/1 "2010-11-09T10:08:13Z")

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My plan is that a PC with XB24-ZB receives sensor data from each end device (XB24-ZB) every 10 minutes. A number of end devices is about 20.

The message has 30 bytes long and alpha-numerics with unique addresses.

In the transparent mode (both PC and devices), can the PC receive each message independently ? I mean, 30 bytes long of data are kept as-is ? I wonder when multiple transmissions happen simultaneously, messages may conflict and be lost.

Your any advice will be appreciated.

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**Author:** ![shuichiy](https://avatars.discourse-cdn.com/v4/letter/s/ee59a6/32.png) [@shuichiy](https://forums.digi.com/u/shuichiy)\
**Post date:** [November 11, 2010, 9:15am UTC](https://forums.digi.com/t/simultaneous-transmission-does-work/1594/2 "2010-11-11T09:15:23Z")

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I have self resolved the issue.  
In my testing with a cordinator, 2 routers and an end device which recently I got represented that AT mode was not suitable for 1:n communication.  
Instead, I configured all xbees as API mode then it works fine.