Choosing A Data Format - Teledyne WORKHORSE Operation Manual

May 2015
This section shows the output data format of the H-ADCP. H-ADCP output data can be in either hexadec-
imal-ASCII or binary format. You can select this option through the CF-command (see the
trol). We explain the output data formats in enough detail to let you create your own data processing or
analysis programs (see How to Decode an H-ADCP

Choosing a Data Format

The H-ADCP can output data in several user selectable formats using the PD command (see
Stream Select). Depending on the output format selected, data will be either binary or ASCII text.
Binary Output Data Format
Use the binary format (CFxx1xx) when recording/processing H-ADCP data on an external device. The bi-
nary format uses less storage space and has a faster transmission time than the Hex ASCII format. A
dumb terminal is of little use in binary format because the terminal interprets some of the data as control
characters.
All of TRDI's software supports binary PD0 formatted data only.
Hexadecimal-ASCII Output Data
Use the hexadecimal-ASCII (Hex ASCII) format (CFxx2xx) when you are viewing raw H-ADCP data on a
computer/dumb terminal. This format uses the standard ASCII codes for 0 through F to represent numer-
ic values as hexadecimal digits. Other standard ASCII characters (text) and control commands (carriage
return, line feed, end of file, etc.) are interpreted normally. In the Hex ASCII mode, the ADCP sends data
in one line of ASCII characters. There are no carriage returns and/or line feed sequences (CR/LF) sent
from the ADCP. The CRT provides a CR/LF after 60 characters.
Hex ASCII PD0 data is not supported by TRDI's software.
Individual parameters within a data string may be enabled / disabled. All binary output formats have the
option of outputting data in HEX-ASCII instead of true binary using the CF command (see
trol). HEX-ASCII is an ASCII representation of the binary data. Binary output formats include PD0, 3, 4,
5 and 10. Text output formats include PD6, 8, and 9.
Deciding on which format to use depends on the needs of the deployment. The following describes the
basics of the formats available.
• PD0 – PD0 is Teledyne RD Instrument's standard format. PD0 is a binary output format. It pro-
vides the most information possible including a header, fixed and variable leader, bottom track,
and water profile information. The fixed and variable leader is a recording of time, H-ADCP set-
up, orientation, heading, pitch, roll, temperature, pressure, and self-test diagnostic results. Data
fields to be output are user selectable.
• PD3 – PD3 is a binary output format of bottom track speed over the bottom, speed through the
water, and range to bottom information.
• PD4 – PD4 is a binary output format of bottom track speed over the bottom, speed through the
water, and range to bottom information.
• PD5 – PD5 is a superset of PD4 and includes information on salinity, depth, pitch, roll, heading,
and distance made good.
• PD6 – PD6 is a text output format. Data is grouped into separate sentences containing system at-
titude data, timing and scaling, and speed through the water relative to the instrument, vehicle,
and earth. Each sentence contains a unique starting delimiter and comma delimited fields.
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EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
Ensemble).
WorkHorse H-ADCP Operation Manual
CF - Flow Con-
PD - Data
CF - Flow Con-