# transmit delay

**URL:** <https://forums.digi.com/t/transmit-delay/1677>\
**Category:** XBee - 802.15.4\
**Created:** [April 26, 2011, 10:00am UTC](https://forums.digi.com/t/transmit-delay/1677 "2011-04-26T10:00:37Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![ender](https://avatars.discourse-cdn.com/v4/letter/e/58f4c7/32.png) [@ender](https://forums.digi.com/u/ender)\
**Post date:** [April 26, 2011, 10:00am UTC](https://forums.digi.com/t/transmit-delay/1677/1 "2011-04-26T10:00:37Z")

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hi,  
i am using XB24-B modules i have to wait 2 seconds before transmit another data after having sent 6 or 7 characters of data without any problems . how can i reduce it? 100ms would be enough  
thank you

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**Author:** ![johnf](https://avatars.discourse-cdn.com/v4/letter/j/848f3c/32.png) [@johnf](https://forums.digi.com/u/johnf)\
**Post date:** [April 26, 2011, 2:33pm UTC](https://forums.digi.com/t/transmit-delay/1677/2 "2011-04-26T14:33:41Z")

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This sounds more like a problem with the way you’re driving the XBees than a problem with the XBees themselves. Can you give more detail on exactly what you’re doing and what the responses are?

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**Author:** ![ender](https://avatars.discourse-cdn.com/v4/letter/e/58f4c7/32.png) [@ender](https://forums.digi.com/u/ender)\
**Post date:** [April 27, 2011, 1:24pm UTC](https://forums.digi.com/t/transmit-delay/1677/3 "2011-04-27T13:24:23Z")

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i want to do position estimating by driving XB24-B modules with pic18f452 for a school project

four of them will be at the corner of a room and the last one will be recive signals from others and compute distance to them

digi support said me to use unicast addressing but i don’t know how to do is there any default configurations for it

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**Author:** ![johnf](https://avatars.discourse-cdn.com/v4/letter/j/848f3c/32.png) [@johnf](https://forums.digi.com/u/johnf)\
**Post date:** [April 27, 2011, 6:57pm UTC](https://forums.digi.com/t/transmit-delay/1677/4 "2011-04-27T18:57:46Z")

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You’ll find that unicast and broadcast addressing are covered in the Digi product manual, so that would be a good place to start. Go to the Digi site, click on “Support” and select the XBee model from the long list. Then the “Documentation” link will take you to the manual and other details.

You could also try the resources in the pinned links at the top of this forum, though it’s the product manual that is most complete.

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**Author:** ![ender](https://avatars.discourse-cdn.com/v4/letter/e/58f4c7/32.png) [@ender](https://forums.digi.com/u/ender)\
**Post date:** [May 3, 2011, 8:21am UTC](https://forums.digi.com/t/transmit-delay/1677/5 "2011-05-03T08:21:07Z")

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thanks, after changing broadcast to unicast i am n ow able to transmit very quickly but i could not change DN from pic it must done four times every circle.  
sometimes it works and i receive the message i want but sometimes i receive ++ATDN i decided it happens because zigbee can not catch one of '+'s that’s why put a delay between them but still it does not work  
by the way i am taking ‘OK(enter)’ command from zigbee with interrupt