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Appendix A Modbus register
Tag Name Register # Data Type Length R/W Description
TURB 40001 Float 2 R Measured turbidity value
TURB INT 40003 Unsigned Integer 1 R Integer turbidity value
TURB INT X 100 40004 Unsigned Integer 1 R Integer turbidity * 100
SENSOR NAME 40005 String 6 R/W Sensor name or location
BUBBLE REJECT 40011
1
1
In order to write to these tags, write 46478 to register 49938
Unsigned Integer 1 R/W Bubble reject status (0=OFF; 1=ON)
SIGNAL AVG 400121 Unsigned Integer 1 R/W
Signal average (0=1; 1=6sec;
2=30sec;3=60sec;4=90sec)
DATALOG INTRVL 400131 Unsigned Integer 1 R/W
Datalog interval
(0=5sec;1=30sec;2=1min;3=2min;4=5min;6=10
min;7=15min;8=30min;9=60min, 10=4hr)
RESOLUTION 40014 Unsigned Integer 1 R/W
Maximum number of decimal places (0=xxxxx,
1=xxxx.x, 2=xxx.xx)
P/F CRITERIA 400151 Unsigned Integer 1 R/W
Pass / Fail criteria for verification. (1 to 10
percent)
TURB UNIT 40016 Unsigned Integer 1 R/W Turb units (0=mg/L:7=NTU;42=FTU)
SERVICE MODE 400181 Unsigned Integer 1 R/W
Used to determine if the instrument is in the
service mode (0 = disabled; 1= enabled)
SERIAL NUMBER 40021 String 6 R Instrument serial number
CODE VERSION 40027 Float 2 R Software version
DD Firmware 40029 Unsigned Integer 1 R Device driver firmware version
DD CONTENT 40030 Unsigned Integer 1 R Device driver content version
HW VERSION 40031 Unsigned Integer 1 R Hardware version of pc board
TEMP 40032 Float 2 R Temperature measurement in Celsius
DARK 40034 Unsigned Integer 2 R Dark turbidity A/D counts.
RAW TURB 40036 Float 2 R
Turbidity value with dark offset and
gain applied.
TURB COUNTS 40038 Unsigned Integer 2 R Turbidity A/D counts
TEMP MAX 40040 Float 2 R Maximum temperature
TEMP MIN 40042 Float 2 R Minimum temperature
LAMP V 40044 Float 2 R Lamp voltage
LAMP CURR 40046 Float 2 R Lamp current (amps)
Plus 5V 40048 Float 2 R Plus five volt measurement
INPUT V 40050 Float 2 R Input voltage (~12V)
VREF 40052 Float 2 R Voltage reference measurement (2.5V)
CAL GAIN 40067 Float 2 R
Calibration gain factor - used to convert A/D
counts to turbidity
INITIALS 40083 String 2 R Initials used for the latest calibration
LAST CAL DATE 40085 Time2 2 R Time of the latest calibration
CAL VALUE 40087 Float 2 R
The standard value used for the latest
calibration
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