Campbell TX312 Instrukcja Użytkownika Pobierz pdf (Strona 8)

SNOTEL GOES Manual Revision 2b - February 17, 2011 page 8 of 10

Micro Specialties, Inc. Wasilla, Alaska

MicroComm GTX Data Modem - Supported as of 3/5/2008

MicroComm‟s GTX data modem can transmit data received from the CR10X in various

field widths within the GOES data stream. The GTX applies a multiplier and offset and

field width to each field it receives from the CR10X. msiDCSdecode must be informed

of the field width, multiplier and offset applied by the GTX modem for each field in the

data stream. msiDCSdecode informs itself of these parameters by parsing the tpl file

generated by the GTX setup program for each site. The tpl file must be sent to Rose

before the data can be decoded for you new data site.

GTX Rules:

 The date (julian) is the first field of the data stream.

 The time (hhmm) is the second field of the data stream.

 The tpl file used to configure the site GTX radio must be provided and named with the

SNOTEL ID. For example, Ashley Divide has a SNOTEL site ID 5009 so the tpl file is

named 5009.tpl.

Data Retrieval Methodology

MsiDCSdecode Revision 2 now retrieves data from the NESDIS LRGS server only

when data has not been retrieved within the last hour, so you may execute the process

every ten minutes or so without invoking extra overhead. The ddsClient module keeps

track of successful retrieval events by logging the date/time (GMT) of the latest GOES

message returned by NESDIS at each successful retrieval. 50 events are retained in

the retrieval log. If the retrieval log does not exist, the process will attempt to retrieve

only the past hour‟s data from NESDIS, otherwise ddsClient will attempt to retrieve all

data from the last successful retrieval through the current date/time. The ddsClient now

uses block mode data retrieval, which speeds up the process considerably.

To start over, simply delete the retrieval log, or invoke msiDCSdecode with the

„freshStart‟ command line option.

Command Line Options

By default, msDCSdecode retrieves and processes all GOES data messages for all

sites which are defined and enabled in the sitedefs configuration file. Also by default,

only data messages received by NESDIS within the past hour will be retrieved. The

application‟s behavior can be modified through command line options. Remember to

protect parameters from the command shell with quotations, where parameters

contain spaces (See Command Line Examples section below). The following

command line options are available:

 host – Define the IP of the LRGS from which data is collected. If this option is

used, automatic switching from the primary to the backup host is disabled.

 help – Show command syntax help and terminate. Do not retrieve or process

anything.

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