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StreamPro ADCP Operation Manual10.8 Binary Checksum Data FormatBIT POSITIONSBYTE 7 6 5 4 3 2 1 01 LSBCHECKSUM DATA2MSBFigure 32. Binary Checksum Data FormatNOTE. The data is always output in this format. See Table 18 for adescription of the fields.Table 18:Hex DigitBinaryByteChecksum Data FormatFieldDescription1-4 1,2 Checksum Data This field contains a modulo 65535 checksum. The Stream-Pro computes the checksum by summing all the bytes in theoutput buffer excluding the checksum.page 82Teledyne RD Instruments
StreamPro ADCP Operation Manual11 How to Decode an ADCP EnsembleUse the following information to help you write your own software.11.1 Rules for the PD0 Data Formata. All data types (i.e. fixed leader, variable leader, velocity, echo intensity,correlation, percent good, etc.) will be given a specific and unique IDnumber. The table below shows some of the most common IDs.Table 19:ID0x7F7F0x00000x00800x01000x02000x03000x04000x05000x0600Common Data Format IDsDescriptionHeaderFixed LeaderVariable LeaderVelocity Profile DataCorrelation Profile DataEcho Intensity Profile DataPercent Good Profile DataStatus Profile DataBottom Track Datab. Once a data type has been given an ID number and the format of thatdata has been published we consider the format for each field has beingfixed. Fixed refers to units used for a given field, the number of bytes ina given field, and the order in which the fields appear within the datatype. Fixed does not refer to the total number of bytes in the data type -see Rule “c”.c. Data may be added to an existing data type only by adding the bytes tothe end of the data format. As an example, the variable leader data containsinformation on ensemble number, time, heading, pitch, roll, temperature,pressure, etc. The format for the bytes 1-53 are now specifiedby changes added in support to the StreamPro ADCP. If additional sensordata is to be added to the variable leader data then it must be addedto the end of the data string (bytes 54-x as an example).d. The order of data types in an ensemble is not fixed. There is no guaranteethat velocity data will always be output before correlation data.e. The header data will include the number of data types in the files andthe offset to each ID number for each data type.f. The total number of the bytes in an ensemble minus the 2-byte checksumwill be included in the header.P/N 95B-6003-00 (February 2008) page 83
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