Agrowtek SXH User manual

© Agrowtek Inc. | www.agrowtek.com | Technology to Help You Grow™
1© Agrowtek Inc. | www.agrowtek.com | Technology to Help You Grow™
Technology to Help You Grow
AGROWtEK
Hydroponics Sensor Transmitter & Data Logger
Temperature, pH, EC (+ORP) & Flow
Contents
Dimensions 2
Installation Instructions 2
Mounting the Transmitter 2
DIN Rail Mounting Kit 2
PPX Probe Pontoon 3
PBX Probe Manifolds 3
Connecting Sensor Probes 4
Connection to ADi Pump 4
pH & ORP Probe Preparation 5
LCD Menu Operation Instructions 6
High / Low History 6
Graphing 6
Main Menu 7
Alarms Menu 7
Alarms Conguration 7
Alarm Buzzer 8
Calibration Menu 8
Clear Calibration 8
Temperature Calibration 9
pH Calibration 9
Conductivity Calibration 10
O.R.P. Calibration 10
Advanced Calibration 11
Analog Output Calibration 11
Setup Menu 12
Time / Date 12
Units 12
Logging Interval 13
COMM Mode 14
Device Address 14
Manufacturing Info 14
Display Back Light Timer 15
Connection to GrowControl™ GCX 16
GrowNET™ Hubs 16
Connection to 4-20mA Outputs 17
Connection to USB AgrowLINK 17
Connection to MODBUS RTU 18
Serial Speed & Format 18
Supported Commands 19
Register Types 19
Sensor Value Registers 19
Calibration Registers 19
MODBUS Holding Registers 20
Maintenance 21
Probe Cleaning 21
pH Probe Reconditioning 21
Technical Information 22
Specications 22
Storage and Disposal 22
Warranty 22
Shown with options
INSTRUCTION MANUAL
SXH / SXH+
SXHM SXH
KEEP THESE INSTRUCTIONS REV 12/23

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2
GPH MNUH/L
72.0
5.14
1550
600
°F
pH
uS
mV
BNC pH Probe
BNC ORP Probe
(+ Model)
Temperature & EC
Probes
GrowNET™
Communication Port
Color 1.8”
LCD
Buttons
Technology to Help You Grow
AGROWtEK
U.S.A.
MADE IN
© Agrowtek Inc. | www.agrowtek.com
WiFi
optional
GrowNET
Link Port
MODBUS
TM
SXH
Water Sensor Data Logger & Transmitter
GrowControl
TM
pH
Probe
o.r.p./d.o.
Probe
Temp Probe | EC Probe
red blk wht | clr red blk
status
WiFi
Reset
MiniDIN
(Analog Models)
5.00 in.
3.38 in.
5.50 in.
1.38 in.
Dimensions
Do NOT connect the GrowNET port to Ethernet networks.
Installation Instructions
Install with the transmitter in the orienatation shown in dimention drawings with the temperature probe
connections facing down to reduce the risk of water permeating the enclosure.
Avoid locations with dripping water or heavy splash risk; the transmitter is best kept dry for longest life and
highest accuracy. Mounting in an enclosure is recommended in extreme humidity or splash/spray locations.
Wall mounting tabs are provided for installing against a vertical wall surface.
1. Measure out the hole locations per the dimensions, or mark the holes using the transmitter as a template.
2. Drill holes and install anchors (if required, not included.) Keep the transmitter away from dust during work.
3. Install the transmitter to the wall surface using appropriate screws.
Mounting the Transmitter
A DIN rail mounting kit installs onto the mounting anges with the provided hard-
ware for mounting the device on a standard DIN rail.
1. Screw the DIN rail brackets onto the anges using the provided screws.
2. Snap the transmitter into place on a DIN rail.
3. Use the latches on the DIN brackets to release the transmitter from the DIN rail.
DIN Rail Mounting Kit

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FROM
SAMPLE
PUMP
WATER
TANK
RETURN
PBX-310
Sensor Manifold
1” NPT
Connections
(optional)
IMPORTANT NOTE: For ow rates above 20 gpm,
ensure probe tips are raised out of the ow path to
prevent turbulence altering the sensor readings.
Sensors may be “oated”directly in a water tank using a “probe pon-
toon” which is designed to keep the probes in contact with the water
as the depth changes.
Serpentene shape allows the pontoon to be installed through nar-
row diameter tank openings.
PPX Probe Pontoon
Sensors may be installed “inline”with ow using 1”PBX series
probe manifolds. Manifolds include removable compression
ttings to seal the probes, and o-ring seals on the manifolds
for easy removal during calibration.
PBX Probe Manifolds

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Connection to ADi Pump
A direct-link connection between a SXHM sensor and ADi pump requires Agrowtek’s cross-over adapter.
IMPORTANT! ONLY use cross-over adapters provided by Agrowtek. Do not use other cross-over adapters or cross-over
cables unless they are constructed exactly as diagramed on the cross-over diagram. Incorrect cross-over adapters or cables
can cause damage to the equipment.
pH and ORP or DO sensors are equipped with“BNC” style connectors which push on and then turn 1/4 rota-
tion CW to lock them in place. Temperature and EC probes have a screw terminal block; make the connec-
tions according to the label on the transmitter. The terminal block may be removed for easier wire installa-
tion or for service.
Connecting Sensor Probes
NOTE:
1. Some EC probes may not have a “clear” wire and may only have a red and black wire.
2. Temperature probes with green wire connect to the “CLR” terminal.
TEMPERATURE SENSOR
FLOW
SENSOR
CONDUCTIVITY SENSOR
pH SENSOR

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pH & ORP Probe Preparation
Probe Shipping & Storage
pH & ORP probes are shipped in a plastic bottle containing a
solution of pH 4 buer and potassium chloride. The electrode
should remain in the bottle until it is used.
If the electrode is used infrequently, the bottle and its solution
should be saved and the electrode stored in it. If the solution in
the soaker bottle is missing, ll the bottle with pH 4 buer.
Take out electrode by loosening plastic top on bottle counter-
clockwise and pulling electrode out. Slide cap and O-ring o
electrode and save.
L
ACK
-
RING
DE TOP
Black
O-ring
inside
Air Bubble
During shipment the air bubble in the
electrode’s stem may move into the bulb
area.
If bubbles are seen in the bulb area, hold
the electrode by its top cap and shake
while pointed downward.
ELBBUBRIA
AIR BUBBLE
Installation/Operation Angle
pH & ORP sensor probes must be installed in an above-horizontal position
with the probe tip facing downward to prevent the air bubble from entering
the the bulb area.
10° min.
pH & ORP probes must remain wet to avoid damage. Do not allow probe tips to dry.

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SXHM models with the optional
3-button/LCD display interface may
be used for stand-alone monitoring
applications or as part of a control
solution.
Connect to Agrowtek’s GrowControl
facility control systems, or directly to
Agrowtek’s AgrowDose pumps for
automatic nutrient and pH control.
LCD Menu Operation Instructions
Simple minimum and maximum recorded values are stored until the user resets
the values to the current readings. To view the minimum and maximum values
since the last reset, press the button labeled H/L.
To clear the min/max history, press the RST button to reset. The min and max
values will all be set to the current readings and will update with higher or lower
readings as they occur.
High / Low History
H/L
The main screen displays the real-time sensor readings from the attached sensors. Each button is labeled at
the bottom of the display to describe it’s function on the current screen or menu.
RSTEXIT
72.0
4.85
657
480
°F
pH
mV
68.4
4.21
551
404
HIGHLOW
uS
The display can graph the most recent 120
data points from the sensor’s internal data
point memory. With the default logging
interval of 60 seconds, the graph displays
the last two hours of data.
The sensor value is plotted in green. Tem-
perature, if overlaid on the plot, is red.
Alarm levels as set by the user are plotted in
yellow. Pressing the RFH button refreshes
the data and replots the graph.
Graphing
RFH BCK
PH
High Alarm
Low Alarm
Temperature
Sensor Data (pH)
GPH
DWN ENTUP
BACK
TEMPERATURE
PH
COND
GRAPH
ORP

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The main menu is how the alarms are set, sensors are calibrated and general
settings such as time, date and units are congured.
If a dosing pump is directly connected to the SXHM GrowNET port, the pump
settings are also accessed by the main menu.
Use the UP or DWN buttons to navigate the menu.
Use the ENT button to enter a selection.
Main Menu
MNU
High and low alarm set points may be congured for each sensor value to
activate an internal buzzer or send alerts with the optional wi module.
The out-of-range value will be displayed in red to indicate the cause for the
alarm.
Additionally, alarm limits are plotted on the graphs to indicate values are
within the desired range.
Alarms Menu
DWN ENTUP
EXIT
ALARMS
CALIBRATION
SETUP
PUMPS
MENU
MNU ALARMS
DWN ENTUP
EXIT
ALARMS
CALIBRATION
SETUP
MENU
DWN ENTUP
BACK
+0.1
-0.1
SET LOW
0.0°F
1. Select ALARMS
from the main menu.
3. Select the setting
to adjust.
2. Select a sensor to
congure set points.
4. Adjust to the desired
value. Hold UP or DWN
to jog the value.
DWN ENTUP
BACK
LOW: 0.0
HIGH: 0.0
ALARM: OFF
ALARM
DWN ENTUP
BACK
TEMPERATURE
PH
COND
ALARMS
ORP
Alarms Conguration
GPH MNUH/L
72.0
5.14
1550
600
°F
pH
uS
mV

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To disable the alarm buzzer,
set the alarm to OFF.
Calibration Menu
Calibration can be performed for each sensor with the
LCD interface using either standard calibration wizards,
or advanced manual calibration methods for non-stan-
dard calibration solutions.
The date of the last calibration for each sensor is stored
in memory and displayed at the start of each calibration
wizard.
MNU CALIBRATION
DWN ENTUP
EXIT
ALARMS
CALIBRATION
SETUP
MENU
DWN ENTUP
BACK
TEMPERATURE
PH
COND
CALIBRATION
CLEAR ALL
DWN ENTUP
BACK
LOW: 0.0
HIGH: 0.0
ALARM: OFF
ALARM
1. Select ALARM: OFF
DWN ENTUP
BACK
SET ON
SET OFF
SET ALARM
OFF
2. Select SET ON then
press BACK to exit.
Alarm Buzzer
1. Select CLEAR ALL
from the calibration
menu.
2. Press YES to restore
factory calibration.
MNU CALIBRATION
Clear Calibration
Calibration can be restored to factory defaults by selecting CLEAR ALL.
NOYES
RESTORE TO
FACTORY
CALIBRATION?
NEXT
DWN ENTUP
BACK
TEMPERATURE
PH
COND
CALIBRATION
CLEAR ALL

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pH calibration is a two-point process requiring both pH 7 and pH 4.01 calibration solutions. The temperature
probe must be inserted into the calibration solution at the same time as the pH probe.
MNU CALIBRATION
pH Calibration
2. Follow the instruc-
tions then press NEXT.
4. Clean the probes with DI/RO
and change calibration solution.
3. When the reading
is stable, press NEXT.
5. When the reading is stable, press DONE
to calibrate pH 4.01 and nish calibration.
NEXTEXIT
PH
LAST CALIBRATION
10/19/2017
STEP 1:
PUT TEMPERATURE
AND PH PROBE IN
PH7 SOLUTION.
NEXTEXIT
PH
WAIT FOR READING
TO STABILIZE THEN
PRESS NEXT.
7.12 pH
NEXTEXIT
PH
STEP 2:
PUT TEMPERATURE
AND PH PROBE IN
PH4.01 SOLUTION.
7.00 pH
DNEEXIT
PH
WAIT FOR READING
TO STABILIZE THEN
PRESS DONE.
4.14 pH
pH 7 Calibration
Solution
pH 4.01 Calibra-
tion Solution
1. Select CALIBRATE
from calibration menu.
DWN ENTUP
BACK
CALIBRATE
ADVANCED
CALIBRATION
PH
1. Select CALIBRATE
from calibration menu.
3. Adjust to the desired
value. Hold ENT to jog
the value by 10x.
2. Press NEXT to con-
tinue.
4. Conrm the new
reading or press NO.
DWN ENTUP
BACK
+0.1
-0.1
OFFSET
72.2°F
NEXTEXIT
TEMPERATURE
LAST CALIBRATION
10/19/2017
PRESS NEXT TO
ADJUST
TEMPERATURE
READING.
NOYES
CONFIRM?
72.2 °F
68.1 °F
OLD
NEW
DWN ENTUP
BACK
CALIBRATE
ADVANCED
CALIBRATION
MNU CALIBRATION
Temperature Calibration
TEMPERATURE

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1. Select CALIBRATE
from the conductivity
calibration menu.
3. When the reading is
stable, press DONE to
complete the calibration.
2. Follow the instruc-
tions then press NEXT
to continue.
DWN ENTUP
BACK
CALIBRATE
ADVANCED
CALIBRATION
MNU CALIBRATION
Conductivity Calibration
Conductivity calibration is a single point process requiring 1413 uS calibration solution. The temperature
probe must be inserted into the calibration solution at the same time as the conductivity probe.
NEXTEXIT
CONDUCTIVITY
LAST CALIBRATION
10/19/2017
PUT TEMPERATURE
AND EC PROBE IN
1413uS SOLUTION.
1. Select CALIBRATE
from the conductivity
calibration menu.
3. When the reading is
stable, press DONE to
complete the calibration.
2. Follow the instruc-
tions then press NEXT
to continue.
DWN ENTUP
BACK
CALIBRATE
ADVANCED
CALIBRATION
MNU CALIBRATION
O.R.P. Calibration
ORP (optional) calibration is a single point process requiring 470 mV calibration solution.
NEXTEXIT
ORP
LAST CALIBRATION
10/19/2017
PUT ORP PROBE IN
470mV SOLUTION.
DNEEXIT
CONDUCTIVITY
WAIT FOR READING
TO STABILIZE THEN
PRESS DONE.
1440 uS
NEXT
DNEEXIT
CONDUCTIVITY
WAIT FOR READING
TO STABILIZE THEN
PRESS DONE.
1440 uS
COND
ORP

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Advanced Calibration
Sensors values may be manually calibrated to alternate standards using the
advance calibration features.
OFFSET calibration applies a linear oset adjustment to the value.
SPAN calibration applies an adjustment to the slope of the sensor value.
Note: pH and conductivty are temperature compensated (ATC) sensors. For
accurate calibration, the temperature probe must be in the pH and conduc-
tivity calibration standards. Allow all readings to stabilize before performing
an oset or span calibration operation.
PH
CAL 7 sets the pH 7 calibration (oset.) Cal 7 automatically clears span calibration point prior performing pH
7 calibration.
SPAN calibration is performed typically at pH 4.01 or 10.0 (Always perform pH 7 calibration rst.)
CONDUCTIVITY
SET CAL 0 calibrates a dry EC probe if required. (not recommended)
SPAN calibration is recommended at 1413uS. If using ppm standards, ensure the display is in the correct
units.
DiSSOLVED OXYGEN (D.O.)
OFFSET calibration is recommended in zero oxygen solution.
SPAN calibration is recommended at a known DO level or in air.
OXIDATION REDUCTION POTENTIAL (O.R.P.)
OFFSET is recommended at 270mV
SPAN is recommended at 470mV
DWN ENTUP
BACK
CALIBRATE
ADVANCED
CALIBRATION
4-20mA analog outputs may also be calibrated with a positive or negative
oset to compensate for variation in DAC’s/ADC’s. The sensors’ current output
may be incrementally increased or decreased in steps of 0.005mA over a range
of +/-2mA.
1 Oset bit = 0.005mA, Range = +/-400 bits (+/-2mA)
This calibration procedure is optional and only for use with custom PLC appli-
cations.
1. Observe the PLC’s input or data readings.
2. Increase or decrease the oset value to incremenetally adjust the current output until the values match.
Analog Output Calibration
DWN ENTUP
BACK
+1
-1
ANALOG
-5

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The setup menu is where the time and date are
set, the units are congured, logging interval is
adjusted and advanced communications settings
are available.
Setup Menu
Sensors include a precision real-time clock with battery back-up for time-stamping the data log information
with the time and date. The last calibration for each sensor is also time stamped.
Time / Date
1. Select TIME/DATE
from the setup menu.
3. Use NXT to select
the value to adjust.
Use +to increment the
value.
2. Select TIME or
DATE to adjust.
4. Use EXT to exit the
menu.
DWN ENTUP
BACK
TIME/DATE
UNITS
LOG INTERVAL
SETUP
NEXT
DWN ENTUP
BACK
COMM
DEVICE ADD
MFG INFO
SETUP
BACKLIGHT
DWN ENTUP
BACK
TIME/DATE
UNITS
LOG INTERVAL
SETUP
NEXT
DWN ENTUP
BACK
TIME
DATE
TIME/DATE
+EXTNXT
DATE
10/20
2017
+EXTNXT
TIME
13:37:51
Temperature and Conductivity may be displayed
in alternate units.
Select a sensor value to change the default display
and working units.
Units
DWN ENTUP
BACK
TIME/DATE
UNITS
LOG INTERVAL
SETUP
NEXT
DWN ENTUP
BACK
TEMPERATURE
EC
UNIT SELECT
MNU SETUP
MNU SETUP TIME/DATE
MNU SETUP UNITS

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Adjust the interval for recording data points in the
on-board memort. Acceptable values are from 1 -
65535 seconds.
21,600 data points can be stored for each sensor
value. The most recent 120 data points are shown
on the graphical history.
The entire data history may be downloaded from
the sensor to a .csv le with the LX1 USB AgrowLINK
and free software.
Note: 60 second intervals = 15 days of data storage.
Logging Interval
Congure temperature units:
1. Select TEMPERATURE
from the units menu.
2. Select the desired
units and press ENT.
DWN ENTUP
BACK
TEMPERATURE
EC
UNIT SELECT
Temperature may be displayed in °F or °C.
Note: Check alarm settings when converting
temperature units.
DWN ENTUP
BACK
°C
°F
UNIT SELECT
68.0°F
Congure conductivity units:
1. Select EC from the
units menu.
2. Select the desired
units and press ENT.
Conductivity may be displayed in default units of
microSiemens (uS) or total dissolved solids in parts
per million (ppm.)
The TDS conversion factor used by this meter is 500.
TDSppm = uS x 0.5
DWN ENTUP
BACK
TEMPERATURE
EC
UNIT SELECT
DWN ENTUP
BACK
US
TDS
UNIT SELECT
654 ppm
MNU SETUP LOG INTERVAL
1. Select LOG INTERVAL
from the setup menu.
2. Adjust the value
then select BACK.
DWN ENTUP
BACK
TIME/DATE
UNITS
LOG INTERVAL
SETUP
NEXT
DWN ENTUP
BACK
+1
-1
LOGGIN INTERVAL
60 SEC

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COMM mode species whether the sensor is a
normal passive device or“mini-master”device.
NORMAL Use with GrowControl master controller
systems or stand-alone and data logging applica-
tions.
MINI-MASTER Use with MDX mini-dosing system.
(GrowNET cross-over adapter required.)
COMM Mode
MNU SETUP NEXT COMM
1. Select COMM from
the setup menu.
2. Select a mode and
press ENT.
Sensors are digitally addressable from 1-249 and
will be assigned an address automatically by
Agrowtek’s control systems, or can be congured
manually for MODBUS applications via the menu.
NOTE: All of Agrowtek’s devices use address 254 as
a broadcast address.
Device Address
MNU SETUP NEXT DEVICE ADD
1. Select DEVICE ADD
from the setup menu.
2. Adjust the value
then select BACK.
DWN ENTUP
BACK
COMM
DEVICE ADD
MFG INFO
SETUP
BACKLIGHT
DWN ENTUP
BACK
+1
-1
DEVICE ADDRESS
0 Addr
DWN ENTUP
BACK
COMM
DEVICE ADD
MFG INFO
SETUP
DWN ENTUP
NORMAL
MINI MASTER
COM MODE
Manufacturing Info
MNU SETUP NEXT MFG INFO
Manufacturer information such as serial number,
date of manufacture, hardware and rmware
versions can be read from the MFG INFO page.
1. Select MFG INFO
from the setup menu.
2. Press EXIT to re-
turn.
DWN ENTUP
BACK
COMM
DEVICE ADD
MFG INFO
SETUP
BACKLIGHT
EXIT
17090554
SERIAL NUMBER:
09/15/17
DATE OF MFG:
C
HW VERSION:
02.03.84
FW VERSION:

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Display Back Light Timer
MNU SETUP NEXT BACKLIGHT
The display back light can be programmed to
turn o after a specied time of inactivity from
the last time a button is pressed.
The delay can be set from 1-255 minutes, or set
to 0 to disable the back light timer and keep the
display on continuously.
DWN ENTUP
BACK
COMM
DEVICE ADD
MFG INFO
SETUP
BACKLIGHT
DWN ENTUP
BACK
+1
-1
BACKLIGHT
60 Min

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GrowNET™ Hubs
All GrowNET™ devices are connected using standard CAT5 Ethernet cable with RJ-45 connections.
Devices can be connected directly to the GrowNET™ ports on the bottom of the controller, or through HX8
GrowNET™ hubs. It is typical to simplify cabling by locating hubs centrally in hall ways and rooms allowing
single runs from an 8-port device hub back to a central hub or back to the controller.
HX8 GrowNET ™ hubs expand a single port into eight more ports.
Hubs can be daisy-chained to form a network of up to 100 devices per
GrowNET™ bus. Individually buered port transcievers provide excellent
signal integrity and extended communication strength and range.
Hubs provide up to 1A of power for operating sensors and most relays
directly over the CAT5 cable. A DC jack on the hub provides 24Vdc power
to the ports from the included wall power supply. A terminal block
power option is also available.
DIELECTRIC GREASE
Dielectric grease is recommended on RJ-45 GrowNET™ connections when used in humid environments.
Place a small amount of grease onto the RJ-45 plug contacts before inserting into the GrowNET™ port.
Non-conductive grease is designed to prevent corrosion from moisture in electrical connectors.
• Loctite LB 8423 • Dupont Molykote 4/5 • CRC 05105 Di-Electric Grease
• Super Lube 91016 Silicone Dielectric Grease • Other Silicone or Lithium based insulating grease
NOTICE
GrowNET™ ports use standard RJ-45 connections but are NOT compatible the Ethernet network equipment.
Do not connect GrowNET™ ports to Ethernet ports or network switch gear.
Installation Notes
Refer to the GCX controller manual for details on adding the device to the system.
Connection to GrowControl™ GCX

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LX1 USB AgrowLINK connects Agrowtek’s devices to a computer’s USB port for:
Connection to USB AgrowLINK
• Firmware Updates
• Calibration
• Conguration
• Data Logging Download
• More
Sensors are available with optional 4-20mA analog outputs. Use the LX3 DinLINK for wire connections. A
mini-din 6 connector is included on units with 4-20mA outputs for power and analog connections. LX3 con-
nects the mini-din 6 cable to a terminal block break-out with terminals for 24V power the four analog chan-
nels. 4-20mA linear outputs correspond to the ranges in the sensor specications table.
Connection to 4-20mA Outputs
24VDC
4-20mA PLC
ANALOG INPUTS
MINI-DIN 6
Analog Cable
LX1
USBGrowNET™ RJ45

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Connection to MODBUS RTU
Serial Speed & Format
RS-485
Use the LX2 ModLINK to connect MODBUS devices to the GrowNET™ port.
The default serial data format for the LX2 ModLINK interface is: 19,200 baud, 8-N-1.
Alternate speeds and formats between 9,600 - 115,200 baud may be congured with the free AgrowLINK PC
utility using a LX1 USB AgrowLINK and the cross-over adapter supplied with the LX2 ModLINK.
MODBUS Manual
See MODBUS manual for more information.
LX2 ModLINK™LX1 USB AgrowLINK™
GrowNET™
Cross-Over
7 - 24 Vdc
USB
Cro
ss
Ove
r
RJ45/CAT5
7 - 24 Vdc
3.3/5Vdc Serial Bus Compatible.
Include required bus terminating resistors per EIA standard.
TX/RX+
TX/RX-
PLC
RS-485

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Calibration registers are 16-bit signed integers for the purpose of calibrating the sensor values or analog out-
put channels. Calibration may be achieved by writing the desired calibrated value to the associated register.
Writing to the calibration registers automatically invokes the calibration routine for that register.
Zero (Oset) Calibration
Zero calibration is an arithmatic positive or negative correction to the sensor reading.
Operations performed using the oset register are:
-Temperature calibration
-pH 7 calibration
-Conductivity, ORP or DO zero calibration
To perform a sensor oset calibration, simply write the corrected sensor value to the oset calibration reg-
siter (taking into account the integer scaling.)
To set the temperature to a calibrated value of 25°C, write the value“2500.”
To set the pH 7 calibration, write the value “700.”
To set the conductivity zero calibration, write the value “0.”
Span Calibration
Span, or slope calibration, corrects the slop of the sensor reading at a second point, away from the zero cali-
bration. Operations performed using the span register are:
Calibration Registers
Sensor values are available in integer or oating point formats depending on the register requested (see
map.)
Sensor Value Registers
For example: an integer temperature value of 2417 is equal to a temperature reading of 24.17°C.
Supported Commands
All registers are 16 bits wide with addresses using the standard MODICON protocol. Floating point values
use the standard IEEE 32-bit format occupying two contiguous 16 bit registers. ASCII values are stored with
two characters (bytes) per register in hexadecimal format.
Register Types
0x03 Read Multiple Registers
0x06 Write Single Register
A request to use a function that is not available will return an illegal function exception.
Sensor # Type Integer Scale Range
1 Temperature x100 -2000 - 6000 (-20 - 60°C) / -400 - 14000 (-4 - 140°F)
2 pH x100 0 - 1400 (0 - 14.00pH)
3 Conductivity x1 0 - 5000 microSiemens
4O.R.P. x1 -1000 - +1000 mV
D.O. x100 0 - 4000 (0 - 40.00 mg/L max, per cal)

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20
-pH 4.01 or 10.0 calibration
-Conductivity, ORP or DO calibration to solution standard
To set the pH 4.01 calibration, write the value “401.”
To set the conductivity to a calibrated value of 1413uS, write the value“1413.”
Note: perform any“zero” calibrations prior span calibrations.
Analog Calibration
Analog output calibration sends a positive or negative oset to the respective output channel’s digital to
analog converter (DAC.) The DAC has a resolution of 0.005mA/bit.
±1 calibration bit = ±0.005mA adjustment
For example: to shift the analog output up by 0.1mA, set the analog oest value to +20. ( 0.1 / 0.005 = 20)
MODBUS Holding Registers
Parameter Description Range Type Access Address
Address Device Slave Address 1 - 247 8 bit R/W 40001
Serial# Device Serial Number ASCII 8 char R 40004
DOM Date of Manufacture ASCII 8 char R 40008
HW Version Hardware Version ASCII 8 char R 40012
FW Version Firmware Version ASCII 8 char R 40016
Toggle Units Toggle sensor units 1 - 4 16 bit, unsigned W 41002
Sensor Reading,
Integer
Temperature -2000 - 6000 (-20 - 60°C)
16 bit, signed R
40101
pH 0 - 1400 (0 - 14.00pH) 40102
Conductivity 0 - 5000 microSiemens
0 - 2500 ppm
40103
O.R.P. / D.O. -1000 - +1000 mV
0 - 4000 (0 - 40.00 mg/L)
40104
Sensor Reading,
Float
Temperature -20.00- 60.00 °C
32 bit, oating pt R
40201
pH 0 - 14.00pH 40203
Conductivity 0 - 5000 microSiemens
0 - 2500 ppm
40205
O.R.P. / D.O. -1000 - +1000 mV
0 - 4000 (0 - 40.00 mg/L)
40207
Calibration Input,
Zero
Temperature
See integer ranges above. 16 bit, signed W
41101
pH 41102
Conductivity 41103
O.R.P. / D.O. 41104
Calibration Input,
Span Point
Temperature
See integer ranges above. 16 bit, signed W
41201
pH 41202
Conductivity 41203
O.R.P. / D.O. 41204
Calibration Input,
Analog Output
Temperature
-255 - 255 (bits) 16 bit, signed W
41301
pH 41302
Conductivity 41303
O.R.P. / D.O. 41304