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Problem with connecting 89S52 and PICAXE18X using RS-232

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DrWhoF

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I am trying to connect 89S52 and PICAXE18 using RS-232.
I can simulate connection with windows hyperterminal at 2400bps and both microcotrollers respond correctly but when I connect them together 89S52 sends a command but PICAXE18 does not respond. Why?
 

Re: 89S52 and PICAXE18X

One possible reason can be that clocks of both microcontrtollers "don't match" and they both, or one of them - in this case PICAXE, can not read properly 2400bps strings ..
As PICAXE is clocked by internal RC-based generator you can use CALIBFREQ command and try to correct it ..
You will have +/-31 numbers to play with, where 0 is the default value ..

Regards,
IanP
 

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    DrWhoF

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Re: 89S52 and PICAXE18X

That was it!!! CALIBFREQ 28 fixed the problem.
Thaks very much.
 

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