700-Bubbler-Man Rev 12 13 Feb 2020
Page 36/51
5.2 EXTENDED (X) COMMANDS
In addition to the standard set of commands, the FTS Bubbler has an extension of custom SDI -12
commands called X commands that access specific features of the sensor.
The format of X commands follows the requirement for standard SDI-12 commands in that the first
character of every command must be a sensor address which is then followed by the X command
and terminated by an exclamation mark. Likewise, the first character of a response is also the
address character.
Some commands can be used to either view a parameter (“get”) or input a parameter (“set”). Set
commands use an optional parameter P or a float parameter P.p. To “set” a value, the P or P.p
should be replaced with the desired numeral(s). If the optional parameter is not used, it is a “get”
command and will return the previously set value.
5.2.1 Required Formatting Elements
In order for X commands to be valid, the following format conditions must be met:
• the commands start with an address plus X and terminate with !
• the X command elements must be capitalized (as shown in the following table);
• there must be no spaces within the command
• in “set” commands, the ’P or P.p’ or should be replaced with the desired numerals.
5.2.2 SETTING THE BUBBLER’S DATE AND TIME
The Bubbler’s SD card stores data independently from the data logger and as such, is timestamped
by the Bubbler. Transmitted data will be timestamped in accordance with the data logger’s clock.
IMPORTANT! The Bubbler’s time and date MUST be input using the Set date and Time
X-command for a timestamp to be present on the log entries. Additionally, the
Bubbler’s timestamp is cleared if the Bubbler has been powered off and must be
reset once power is restored.
Should the data logger and Bubbler’s times fall out of synchronization, the Bubbler’s date and time
can be adjusted using the XDT command.
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