I look at the ACH_USED field first, which tells you which channels are in use. I'm not sure if the data in the DEVICE_ID field is valid if the ACH_USED bit is 0.
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I look at the ACH_USED field first, which tells you which channels are in use. I'm not sure if the data in the DEVICE_ID field is valid if the ACH_USED bit is 0.