Campbell SAT ARGOS Manual de usuario descargar pdf (Pagina 64)

ZENO

-3200 USER MANUAL

Coastal Environmental Systems (206) 682-6048

Page 56

 DD is the day (1 to 31)

 HH is the hour of day (00 to 23)

 MM is the minute (00 to 59)

 SS is the seconds (00 to 59)

4.1.6. Downloading Data Records Into A File As A Text Dump

When you want to download Data Records from the ZENO

-3200 into a computer, there are two ways

you can retrieve data:

 Using a simple text dump

 Using the X-modem protocol

To download Data Records into a file, your terminal emulation program

needs to be equipped with a "File Capture" mode.

To do a simple text dump, you need to start the "File Capture" function of your terminal emulation

program before you enter any data retrieval command.

The procedure is as follows:

1. Enter the Data Retrieval Menu of the ZENO

-3200 User Interface.

2. Start the "File Capture" function in your terminal emulation program.

3. Enter the desired data retrieval command.

4. Wait for all of the requested Data Records to be transmitted by the ZENO

-3200.

5. After the ZENO

-3200 has finished sending all of the requested Data Records, stop the "File

Capture" function of your terminal emulation program.

Using a simple text editor, you can remove any unwanted information at the beginning of the captured

text file that will be there before the actual Data Records.

4.1.7. Downloading Data Records Into A File Using The X-Modem Protocol

Unlike a simple text dump, the X-modem file transfer protocol

uses built-in error-checking algorithms

to verify that the messages being transmitted by the ZENO

-3200 are readable by your computer.

Whereas you can directly view the content of a simple text dump, you cannot readily view contents of an

X-modem communication because it is binary and broken up into chunks for error checking.

The X-modem file transfer protocol was developed by Ward Christensen in 1977 and is a public domain. It is a

simple send-and-wait ARQ (automatic repeat request) protocol using a fixed-length data field and uses either a

simple single-byte checksum or CRC checksum for error detecting. For a complete description of the X-modem file

transfer protocol, refer to pages 100-112 of the book C Programmer's Guide to Serial Communications, 2nd

Edition: Joe Campbell, 1994, Sams Publishing.

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Campbell SAT ARGOS Manual de usuario Pagina 64