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MSP430I2041: TIDM-SERVER-PWRMON questions about 'GET_READINGS' format

pathfinder
Genius 12790 points
Part Number: MSP430I2041
Other Parts Discussed in Thread: TIDM-TWOPHASEMETER-I2040

Support,

I am using the TIDM-SERVER-PWRMON, looking at design guide, SLAA638.  The format for CMD_GET_READINGS is shown on page 32, Table 9.  We may have moved over to the TWO_PHASE software for the base, but I'm assuming that the DLT645, UART format is the same?

1. As I understand it, there are ENERGY values being sent also, at the bottom, below Offset 30.  I say this since the Calibrator tool is receiving and displaying them?

2. Verify that for PF, the value should be between '0x0000 and 0x03E8'?  I'm calculating this based on the fact that Power Factor resolution is 0.001.

3. Can you provide an updated Table 9 that includes Energy?

Thanks,

Marc

  • 0
    TI__Mastermind 49692 points

    Marc,

    pathfinder said:
    1. As I understand it, there are ENERGY values being sent also, at the bottom, below Offset 30.  I say this since the Calibrator tool is receiving and displaying them?

    The Energy values should get sent using the HOST_CMD_GET_CONSUMPTION command.

    pathfinder said:
    2. Verify that for PF, the value should be between '0x0000 and 0x03E8'?  I'm calculating this based on the fact that Power Factor resolution is 0.001.

    The default resolution seems to be 0.0001. For example, 

    • Power Factor (16-bits, 0xD949 = -9911 = -0.9911PF, since the default units are 0.1 mPF, divide by 10000)
    • 0x49
    • 0xD9

    Range should be from -1 to 1.

    pathfinder said:
    3. Can you provide an updated Table 9 that includes Energy?

    Unfortunately, this design does not support energy measurements, so we can't update Table 9 with energy. Remember, this is why we moved to the TIDM-TWOPHASEMETER-I2040 software which does measure energy. As mentioned above, look for the HOST_CMD_GET_CONSUMPTION command.

    To other community members, this is an ongoing project done using software based on our legacy Energy library. For all new designs, we recommend using the Energy Measurement Design Center (EMDC) GUI and software library.

    Regards,

    James

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