In-Situ TROLL 9500 Operators Manual - Manual (Page 136)

131
TROLL 9500 Operator’s Manual 0095110 rev. 007 01/09
Order Parameter Unit
1 Pressure PSI
2 Temperature degrees Celsius
3 Barometric Pressure PSI
4 Turbidity NTU
5 pH pH
6 ORP milliVolts
7 Conductivity (Actual) μS/cm
8 D.O. (Polarographic) mg/L
9 Battery Voltage volts
10 Nitrate ppm
11 Ammonium ppm
12 Chloride ppm
13 RDO (Optical D.O.) mg/L
14 Conductivity (Specific) μS/cm
15 Salinity PSU
16 D.O. (Polarographic) % saturation
17 RDO (Optical D.O.) % saturation
18 Ammonia ppm
19 Total Dissolved Solids g/L
20 Resistivity kOhm-cm
Table 19-2. SDI-12 Parameter Reporting (Default Order)
SECTION 19: SDI-12 OPERATION
SENSOR IDENTIFICATION
In response to the “send identification” command, the MP TROLL
9500 will respond as follows:
The default sensor address is 0. The device supports software-
changeable addresses.
SENSOR VERIFICATION
In response to the Verification command, the MP TROLL 9500 will
respond as follows:
MAKING SDI-12 MEASUREMENTS
When measurements are made they will be taken on all sensors in-
stalled in the MP TROLL 9500. “Derived” or calculated measurements,
available in Win-Situ, are reported in SDI-12 for D.O. and conductivity.
For example, the D.O. sensors can report oxygen concentration in
milligrams per liter and saturation in percent. Specific conductance is
reported as well as conductivity.
TIP: SDI-12 protocols use the term “sensor” for a single SDI-
12 device with an address. In this usage, the MP TROLL
9500 is a “sensor,” even though it includes up to 11 installed
“sensors” in the In-Situ usage. The “sensors” in the In-Situ usage
cannot be addressed individually using SDI-12 protocols.
The default order in which parameters are reported, and the units for
each parameter, are listed in Table 19-2.
TIP: You can change the default order of parameters
reported in Win-Situ or Pocket-Situ like this:
1. Select the MP TROLL in the Navigation tree
2. Select Edit
3. In the dialog box, select “SDI-12 mode preferences”
According to the SDI-12 specification the Start Measurement com-
mand “aM!” can take up to 9 measurements. Since the MP TROLL
9500 can potentially report more than 9 measurements there are two
approaches to measuring all sensors:
s
command supports up to 20 measurements.
s
logger would first issue an “aM!” command. If the command
responds with 9 measurements then the logger will send an “aM1!”
command (after reading the initial measurements with the “aD0!”
command), and read the measurements with the “aD0!” command.
This process is repeated, progressing through the value of “n”, until
the “aMn!” command responds with less than 9 measurements.
When parameters are read back over the SDI-12 bus via one of the
“aDn!” commands they will be reported in a fixed order (Table 19-2).
If a unit has duplicate transducers, only one will be reported under
this fixed-order reporting, by order of the port it is plugged into. For
example, if two pH sensors are plugged into ports 1 and 3, the sensor
in port 1 will be reported.
Note that the fixed reporting order can be changed as as described in
the tip  on this page.
A measurement is returned for all possible MP TROLL parameters.
Sensor (MP TROLL 9500) model
Manufacturer (In-Situ Inc.)
Firmware version
SDI-12 compatability (version 1.3)
Serial number
Sensor address
013IN-SITU WQP100154030452 <CR><LF>
Firmware version (2 decimal places)
2-digit entity code
Hardware version (1 decimal place)
Serial number
Sensor address
0+030452+30+1.54+3.0+5+3.0+4.5 <CR><LF>
Battery type (0=none, 5=alkaline, 6=lithium)
Battery voltage
External power voltage