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USB to GPIO GUI - PMBus Group Command

C. Ryan Land
Genius 9860 points

Hello,

On the USB to GPIO GUI - What is the syntax necessary to send out two bytes to four individual devices at addresses 28 through 31 using PMBus Group Command? Also, when is it necessary to check the Last Segment box?

 

Thanks for your support!

 

 

  • 0
    TI__Genius 13700 points

    Since I can't locate any documentation on this particular GUI interface (EVM was designed by another group), my assumption of the Group Command operation would be the following.

    As the Group Command is meant to send single commands to multiple devices (multiple addresses) to be implemented at the same time and there is only one address and command location provided in the GUI then each device address/command pair is entered individually (Send) with the final pair entered with the Last Segment box checked to indicate that the Group Command is complete and can be transmitted.

    If I get a chance I will try this out but I'm fairly certain that this is the intention.

    Remember that only one command can be sent to any one device during a Group Command transmission.

  • 0 in reply to Brad
    TI__Genius 9860 points

    Thank you for your help. Your clear explanation of Group Command is very useful.

    I have a follow-up question. Is there any special syntax associated with sending two bytes out (ex. C5F1) on Group Command? That is, can the hex value be entered on "Data" as C5F1 or must there be special characters, such as a space (C5 F1) or comma (C5, F1) etc?

  • 0 in reply to C. Ryan Land
    TI__Genius 13700 points

    No special syntax required.  Some devices may require a particular order for the bytes in a command,such as, little endian, which requires that the low byte be passed first. Your example would be sent as follows: F1C5 

  • 0 in reply to Brad
    TI__Genius 9860 points

    Thank you for your rapid responses! This has been helpful.