Hi Matej, 9600 baud is a good starting point. The baud rate is not unlimited and the fastest practical baud rate is 115200. Which baud rate you choose depends on the desired conversion data rate. After the reset command is issued you must wait a minimum of 80us before sending any other command to allow time for the device to properly reset the internals of the device. All communication to the ADS122U04 must begin with the synchronization word 0x55. This is explained in the protocol section of the datasheet in 8.5.1.4 on page 34. The synchronization word is used to validate the baud rate and that the communication is a valid command. So the answer is yes to 0x55 RESET, 0x55 START/SYNC, etc.. If there is data to be returned such as RREG or RDATA, you must wait for the data to be returned before sending any more commands. You must also make sure that both AVDD and DVDD are at the nominal supply voltage before attempting to communicate. Also, make sure that the RESET pin of the ADS122U04 is at a logic high level (pulled up to DVDD). Best regards, Bob B
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