Xylem System 5000 User Manual - Manual (Page 113)

111
System Setup - Communications
Start Measurement
Sends the sensor address followed by ‘M!’ which is the standard SDI-12 measure command.
The response to this command is the time required to make the measurement and the number
of values that will be returned by the sensor. When the measurement information is ready, the
sensor address will be received. Pressing the D button to retrieve the data response will reveal
the parameters generated from the Measurement command. If a more complex measurement
command is needed (e.g. ‘M1!’), the Extended CMD mode will need to be used. See the sensor
manufacturer’s documentation for a description of the actual response for each sensor.
Retrieve Data Response
Sends the sensor address followed by ‘D0!’ which is the standard SDI-12 data retrieval command.
The command is used to retrieve data from the sensor following a measurement command or
other command that may take longer than a second to complete. Executing this command prior
to a completed sensor measurement will abort the previous measurement. If more parameters
are available after the response to the ‘D0!’ command, subsequent ‘D1!’, ‘D2!’, etc commands will
be automatically issued to retrieve all data values. Refer to the sensor manufacturer for proper
response to the Data Command.
Using Extended Commands
The Extended Commands screen allows
any custom SDI-12 commands to be sent,
including those specific to a single sensor
that may not be part of the standard SDI-
12 command set. Extended Commands
are sent exactly as entered followed by the
‘!’ terminator (if not specified). All SDI-12
communication can be seen in the above
window. Refer to the sensor manufacturer’s
documentation for proper responses to
the sent commands.
Extended Command
Defines the command to be sent when
the Send button is pressed. The trailing
‘!’ terminator is optional.