Xylem H-5223 - Manual (Page 34)

T - Test Address
This is the SDI-12 address that will be used when any of the commands are sent to connected
sensors. This allows a single key press to send any of the standard SDI-12 commands. If “0”
was used as the Test Address, all SDI-12 commands would be directed to the sensor with
address “0.”
A - Acknowledge
This command sends the address followed by the “!” terminator. The normal response is the
sensor address followed by a Carriage Return and Line Feed. If the sensor is not connected or
does not respond, the H-5223 will respond with, “Communication Timed Out”.
I - Identify
This command sends the address followed by “I!” which is the standard SDI-12 identify
command. The normal response is the sensor address followed by general information about
the sensor such as version number, manufacture, etc. The command is terminated with a
Carriage Return and Line Feed. If an error occurs, the H-5223 will respond with
“Communication Timed Out.” Refer to the sensor manufacturer for proper response to the
Identify Command.
V - Verify
This command sends the address followed by “V!” which is the standard SDI-12 verify
command. The normal response is sensor specific information such as a memory test result. If
an error occurs, the H-5223 will respond with “Communication Timed Out.” Refer to the
sensor manufacturer for proper response to the Verify Command.
M - Measure
This command sends the address followed by “M!” which is the standard SDI-12 measure
command. If an error occurs, the H-5223 will respond with “Communication Timed Out”.
The normal response to this command is the address followed by 4 numbers. The first three
numbers is the amount of time required for the sensor to make the measurement and store the
data in a buffer making it ready for retrieval. The last number is the number of values that
will be returned when using the ‘D’ commands. Refer to the sensor manufacturer for a
detailed description of the response to the Measure Command.
D - Data Retrieval
This command sends the address followed by “D0!” which is the standard SDI-12 data
retrieval command. Executing this command prior to a completed sensor measurement will
abort the measurement and cause just the sensor address to be sent back. If an error occurs,
the H-5223 will respond with “Communication Timed Out.” Refer to the sensor
manufacturer for proper response to the Data 0 Command. There are cases where the data
retrieval command cannot retrieve all the data available. In this case a D1, D2 up to a D8
command may need to be sent to the sensor to retrieve all the data available.
3-12 Remote Operation (Menu Mode)
H-5223