Data Collection 4-5
It is recommended that the terminal software be set up to translate
incoming carriage returns (CR) to carriage return/line feed (CR/LF)
sequences so the data returned from the UWCPC does overwrite the
previous written line piling all the data on a single line on the
screen. It is also convenient to enable local echoing of characters so
data typed on the keyboard is shown on the screen as well.
Once connected and running, pressing the “Enter” key within the
terminal software will elicit a response of “ERROR” from the
UWCPC. This indicates that the UWCPC and computer are in
communication, but it didn’t know what you were asking. Data
records beginning with the character “D” will also be displayed
every six seconds as the UWCPC reports from its power-up default
condition.
Appendix B, “Firmware Commands,” contains a large list of
commands that control the operation and data reporting options of
the UWCPC. The most immediately useful command is the SM (Set
Mode) command which controls what data is reported and its
frequency. The power up default mode is SM,2,60 which implies
sending a data (D) record continuously at the rate of once every
sixty tenths of a second.
Once data is being reported to the screen of the terminal software,
it is quite straightforward to cut-and-paste or turn on the software’s
logging capability to capture the data. Data in this comma
delimited form is easy to import to other programs such as
Microsoft Excel for analysis and graphing.
PC/104 Single Board Computer Option
The UWCPC with the -PC option is assembled with an internal
PC/104 style single board computer (SBC). The SBC used within the
UWCPC at the time this manual was written is a PCM-3347/3348
manufactured by EMAC, Inc. (
http://www.emacinc.com). The SBC
is loaded with the Linux operating system. It is expected that the
user have a working knowledge of Linux and some programming
experience in order to use this option.
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