Xylem H-3551 - Manual (Page 28)

5-10 SDI-12 Command and Response Protocol
H-3551
5.9 Extended Read/Write BubbleRate, PurgePressure and PurgeTime
These commands allow the user to read or write several bubbler configuration settings. The
settings are stored in non-volatile Flash memory. Once the new value is written to the Flash
memory, a copy is sent to the sensor data buffer for verification. This data can be viewed by
using a subsequent "D" command. To verify these settings any other time, use the respective read
commands. These commands take 1 second to complete and place 1 value in the data buffer. The
H-3551 will only accept settings within a specific range as listed below.
Command Response Description
"aXRBR!" “a0011" Read bubble rate setting (bub/min)
"aXRPP!" “a0011" Read purge pressure setting (psi)
"aXRPT!" “a0011" Read purge time setting (seconds)
"aXWBRdd!" “a0011" Write bubble rate setting (bub/min)
"aXWPPdd!" “a0011" Write purge pressure setting (psi)
"aXWPTdd!" “a0011" Write purge time setting (seconds)
Where: a is the sensor address ("0-9", "A-Z", "a-z", "*", "?").
XRBR are upper case characters.
XRPP are upper case characters.
XRPT are upper case characters.
XWBR are upper case characters.
XWPP are upper case characters.
XWPT are upper case characters.
ddd is the new value (For example: 20.0, 195)
Max/min Settings
Parameter Min Max Units
Bubble Rate 30 120 bubbles/min
Purge Pressure 15 80 psi
Purge Time 30 240 seconds
Example of a H-3351 Extended Read Bubble Rate command:
Command Response Time Values Description
"aXRBR!" "a0011" 1 sec 1 Read BubbleRate
Command Response Description
"aD0!" "a+50.0" BubbleRate is 50 bubbles/min
Example of a H-3351 Extended Write Bubble Rate command:
Command Response Time Values Description
"aXWBR30.0!" "a0011" 1 sec 1 Write BubbleRate
Command Response Description