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StreamPro ADCP Operation Manual10.1 Header Data FormatBIT POSITIONSBYTE 7 6 5 4 3 2 1 01 HEADER ID (7Fh)2 DATA SOURCE ID (7Fh)3 LSBNUMBER OF BYTES IN ENSEMBLE4MSB5 SPARE6 NUMBER OF DATA TYPES7 LSBOFFSET FOR DATA TYPE #18MSB9 LSBOFFSET FOR DATA TYPE #210MSB11 LSBOFFSET FOR DATA TYPE #312MSB↓ (SEQUENCE CONTINUES FOR UP TO N DATA TYPES) ↓2N+5 LSBOFFSET FOR DATA TYPE #N2N+6MSBSee Table 9, page 59 for a description of the fields.Figure 25. Binary Header Data FormatNOTE. This data is always output in this format.page 58Teledyne RD Instruments
StreamPro ADCP Operation ManualHeader information is the first item sent by the ADCP to the output buffer.The StreamPro always sends the Least Significant Byte (LSB) first.Table 9:Hex DigitBinaryByteHeader Data FormatFieldDescription1,2 1 HDR ID /Header IDStores the header identification byte (7Fh).3,4 2 HDR ID / DataSource ID5-8 3,4 Bytes / Numberof bytes inensemble9,10 5 Spare Undefined.11,12 6 No. DT / Numberof DataTypes13-16 7,8 Address Offsetfor Data Type#1 / Offset forData Type #117-20 9,10 Address Offsetfor Data Type#2 / Offset forData Type #221-24thru2n+13 to2n+1611,12thru2n+5,2n+6Address Offsetsfor DataTypes #3-n /Offset for DataType #3through #nStores the data source identification byte (7Fh for the Stream-Pro).This field contains the number of bytes from the start of thecurrent ensemble up to, but not including, the 2-byte checksum(Figure 32, page 82).This field contains the number of data types selected for collection.By default, fixed/variable leader, velocity, correlationmagnitude, echo intensity, and percent good are selected forcollection. This field will therefore have a value of six (4 datatypes + 2 for the Fixed/Variable Leader data).This field contains the internal memory address offset wherethe StreamPro will store information for data type #1 (with thisfirmware, always the Fixed Leader). Adding “1” to this offsetnumber gives the absolute Binary Byte number in the ensemblewhere Data Type #1 begins (the first byte of the ensemble isBinary Byte #1).This field contains the internal memory address offset wherethe StreamPro will store information for data type #2 (with thisfirmware, always the Variable Leader). Adding “1” to this offsetnumber gives the absolute Binary Byte number in the ensemblewhere Data Type #2 begins (the first byte of the ensemble isBinary Byte #1).These fields contain internal memory address offset where theStreamPro will store information for data type #3 through datatype #n. Adding “1” to this offset number gives the absoluteBinary Byte number in the ensemble where Data Types #3-nbegin (first byte of ensemble is Binary Byte) #1).P/N 95B-6003-00 (February 2008) page 59
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