# Changing Baud Rate with API mode

**URL:** <https://forums.digi.com/t/changing-baud-rate-with-api-mode/2994>\
**Category:** XCTU\
**Created:** [October 27, 2010, 1:58pm UTC](https://forums.digi.com/t/changing-baud-rate-with-api-mode/2994 "2010-10-27T13:58:56Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![yw12](https://avatars.discourse-cdn.com/v4/letter/y/eb8c5e/32.png) [@yw12](https://forums.digi.com/u/yw12)\
**Post date:** [October 27, 2010, 1:58pm UTC](https://forums.digi.com/t/changing-baud-rate-with-api-mode/2994/1 "2010-10-27T13:58:56Z")

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hello,  
i have a question.  
i want to change baud rate with API mode…now the baud rate is 3-9600(default)…i want to change it to 1-1200…  
i have writed with API mode in HEX

“7E 00 06 08 01 42 44 04 B0 BC”.

but this is not right…  
who can help me?  
thank you~~

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**Author:** ![raoulvb](https://avatars.discourse-cdn.com/v4/letter/r/c6cbf5/32.png) [@raoulvb](https://forums.digi.com/u/raoulvb)\
**Post date:** [October 27, 2010, 4:07pm UTC](https://forums.digi.com/t/changing-baud-rate-with-api-mode/2994/2 "2010-10-27T16:07:17Z")

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Hi,  
for 1200baud you need to set BD=1 so it would be more like  
“7E 00 05 08 01 42 44 01 xx”  
with xx the checksum, which you need to calculate.

regards

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<div class="post-metadata">

**Author:** ![yw12](https://avatars.discourse-cdn.com/v4/letter/y/eb8c5e/32.png) [@yw12](https://forums.digi.com/u/yw12)\
**Post date:** [October 27, 2010, 6:21pm UTC](https://forums.digi.com/t/changing-baud-rate-with-api-mode/2994/3 "2010-10-27T18:21:01Z")

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Thank you for your help.

I have already tried this packet(7E 00 05 08 01 42 44 01 6F ) too,but it is not right.☹

I show you 3 pics.

1.Send Data: the response(Hex in red-color) looks like correct.  
2.PC Setting: i have set “Baud Rate” to 1200 in PC Setting Tab.  
3.Modem Configuration: when i use “read” to see all parameter,then ist failed.

if i make connection again,the Baud Rate changes automatic to 9600(default).

where is the problem?☹

Thank you~~

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**Author:** ![raoulvb](https://avatars.discourse-cdn.com/v4/letter/r/c6cbf5/32.png) [@raoulvb](https://forums.digi.com/u/raoulvb)\
**Post date:** [October 27, 2010, 10:08pm UTC](https://forums.digi.com/t/changing-baud-rate-with-api-mode/2994/4 "2010-10-27T22:08:04Z")

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Hi,  
i am not sure where you got the 1-1200 from… i didn’t check the manual.

This is wrong. 1 equals 2400baud, so you set your radio to 2400baud with the command BD1.  
In order to set 1200baud it needs to be a 0, so BD0 will end up setting 1200baud.

I tried it and it works.

regards

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<div class="post-metadata">

**Author:** ![yw12](https://avatars.discourse-cdn.com/v4/letter/y/eb8c5e/32.png) [@yw12](https://forums.digi.com/u/yw12)\
**Post date:** [October 28, 2010, 9:41am UTC](https://forums.digi.com/t/changing-baud-rate-with-api-mode/2994/5 "2010-10-28T09:41:25Z")

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Hello raoulvb,

Thank you for your help,you are right,1200baud should be a 0,it works now,thank you very much.

but i have new problem now.i have 3 questions.

My first question…i have tried all of the baud rate(0-1200,1-2400,2-4800,3-9600,4-19200,5-38400,6-57600,7-115200).from 0 to 6 exist no problem…but with 7-115200,it doesnt work.i show you the pics.a bit odd.where ist the problem?(pic1 pic2 pic3)

My second question…in PC Settings Tab exist a baud rate 230400,how can i set this value?(pic4)

My third question…can i set an any value as baud rate?for example 360000.if it can,then how should i set it?

i am working now a programm with that,i want to try every thing exactly.

Thank you~~~^^