Hi, 

Yes you are right,

And I'm running my decoder with two AA batteries and RS232 translator with
separated 5.0 V power supply. Please see below. 


Vasile Surducan-2 wrote:
> 
> SM8223 appears it need +3V. So you need an RS232 transciever which run at
> 3V.
> http://www.npcamerica.com/pdf/SM8223.pdf
> 
>>I tried to separate the Power
>> supply of my boards but this time the same problem when connecting TxD
>> (ie
>> T1 pin) of MAX232 to CID decoder serial output was exists.
> 

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