AT GP2 User manual

GP2 Data Logger
and Controller
Research-grade logger controller -capable of complex calculated
measurements and advanced feed-back control
User Manual version 3.0
Delta-T Devices Ltd

Page 2 Contents
Contents
CONTENTS............................................................................................................... 2
UNPACKING ............................................................................................................ 3
OVERVIEW .............................................................................................................. 4
INSTALL DELTALINK................................................................................................. 7
CONNECT TO GP2.................................................................................................... 7
SOURCES OF HELP ................................................................................................... 8
CREATE A SIMPLE PROGRAM IN 6 EASY STEPS ........................................................ 9
THE GP2 SIMULATOR ............................................................................................ 10
SAMPLE PROGRAMS ............................................................................................. 11
CHECK SENSOR OPERATION AND START LOGGING ............................................... 11
RETRIEVE, VIEW AND SAVE LOGGED DATA ........................................................... 11
DATASET IMPORT WIZARD.................................................................................... 11
APPENDIX 1: GP2 RELAY EXPANSION MODULE ..................................................... 12
APPENDIX 2: GP2 NETWORK CABLING .................................................................. 16
APPENDIX 3: CABLE EXPANSION LID...................................................................... 20
APPENDIX 4: WS-CAN CANOPY ............................................................................. 21
APPENDIX 5: DL-MKT UNIVERSAL DATA LOGGER MOUNTING KIT......................... 22
APPENDIX 6: M-ENCL-B2 ENCLOSURE WITH MODEM GATEWAY TO DELTALINK
CLOUD................................................................................................................... 22
APPENDIX 7: MAKE SURE THE GP2 IS PROPERLY SEALED....................................... 24
GP2 SPECIFICATIONS ............................................................................................. 25
PRODUCT CARE AND MAINTENANCE .................................................................... 33
GP2 CALIBRATION CERTIFICATE ............................................................................ 33
LEGAL AND REGULATORY ADVICE ......................................................................... 33
INDEX.................................................................................................................... 34

Unpacking Page 3
Unpacking
The GP2 package contains:
•GP2 Logger (with 6AA batteries to be fitted by the user)
•GP2-USB USB cable for GP2
•This GP2 User Manual
•Screwdriver and cable gland spanner
Accessory Options
GP2-RLY Relay Expansion Module - 4 extra relays
and power terminals
Page 12
WS-CAN an open Protective Canopy with U-bolts
and logger mounting kit for GP2 or DL2e loggers
Page 20
M-ENCL
lockable enclosure
Page 22
DL-MKT Universal Mounting Kit – a flat plate with
U-bolts, nuts and bolts for GP2, GP1 and DL6
loggers
Page 22
GP2-G5-LID Expansion Lid with 5 cable glands for
3 to 10 mm dia. cables
Page 20
8-way M12 analogue signal extension cables
(EXT/8W-xx where xx = 5,10 or 25m)
Page 16
5-way M12 serial communication + power extension
cables (EXT/5W-xx where xx = 1, 5,10 or 25m)
Page 16
GP2-NTP 3-way network T- Piece for connection to
EXT/5W-xx cables
Page 16
GP2-NPC Network Power Cable – to supply power
via a GP2-NTP and/or EXT/5W-xx cable
Page 16
GP2-USB USB cable, 1.5m Page 16
GP2-RS232 RS232 cable, 1.5m Page 16
GP2/GP1-M8 network adapter cable, 1m Page 16
GP2-PSU Mains Power Supply1with mains cable
PC-XX where XX = UK, EU, US, IN or CN
Page 16
GP2-SER Service Pack:– battery holder, desiccant,
cable gland bungs & seals, lid screws, wire links,
screwdriver and dust cap on lanyard
1Not weatherproof, for indoor use only

Page 4 Overview
Overview
•The GP2 has 12 differential analogue input channels2, four event/digital
counter channels, and a serial input channel for up to 62 SDI-12 sensors3or
a single WET sensor.
•Two output relays can be extended to 6 using a relay expansion module.
•Two banks of terminals provide a 3V precision reference, or unregulated
power for sensors. There is also one 5V and one 12 V power terminal.
•Each sensor can be read at a different rate, from 1 second to >1000 days.
•Multiple recording rates are possible for any combination of measurements.
•Multiple recording types are provided:- average, minimum, maximum, total,
integral, wind-rose, conditional.
•The logger can hold about 2.5 million readings.
•Each relay can control a separate experiment, zone or test protocol, each
based on different threshold settings or conditional logic.
•Simple programs are quickly created on your PC, assisted by the sensor
library and a helpful user interface, and then sent to the logger.
•Sophisticated program scripts can be created without having to learn a
programming language or typing out any commands.
•New measurements can be created mathematically along with complex
control algorithms, using algebraic and trigonometric functions and conditional
logic, with easily created sequences of instructions.
•You can create and manipulate your own “variables” for e.g. disease risk
factor, integral error, days since soil moisture below a threshold, etc.
•Thresholds can be changed while logging, by using program settings.
•A simulator assists the checking and understanding of the behaviour of
logging and control programs. A weather pattern can be repeated, or new one
randomly created. It is particularly useful for irrigation.
•Video tutorials, online help, a sensor library and friendly user interface are
provided for the DeltaLINK 3 software.
Sensors Supported
•All Delta-T sensors. Many third party SDI-12 sensors.
•User defined sensors based on voltage, current, resistance, bridge,
potentiometer, counter, frequency and digital state sensors.
•Any number of calculated measurements.
Tutorials
See GP2 Intro Series Tutorials at
http://www.youtube.com/user/DeltaTDevices/videos
2or 24 single-ended analogue channels – but note the limitation on the number of cable glands.
3See also the SDI-12 for GP2 User Manual

Overview Page 5
Layout
Relays Coun te rs Ext
pwr
Internal Battery
connector
Reset
button
WET
Space for Relay Expansion
Board
6 long life alkaline 1.5V
AA/LR6 battery cells
PR2PR2
1
2
3
4
5
6810 12
711 9
+12V
+5V
9 cable
glands for
3-6mm dia.
sensor
cables with
sealing
bungs
Signal input terminals
for analogue channels
7-12
+ power terminals for
each sensor, from
Power Bank B
M12 connector for
joint serial comms.
& external power
cable
Signal input terminals
for analogue channels
1-6
+ power terminals for
each sensor, from
Power Bank A
SDI-12

Page 6 Overview
Event Channels
Use Event 1 or 2to monitor fast switch closures or pulses up to 30 kHz, such as a
flow meter.
Use Event 3 or 4to monitor slower switch closure or pulses <100Hz, such as a rain
gauge. A 5ms de-bounce feature reduces the risk of double counting.
Relay Channels
The Relay channels have an open or closed latching switch, protected with a resetting
thermal-fuse. They can be used in a variety of ways, e.g. to control several different
experiments or irrigation zones, or alarms, or to switch power to sensors.
Each relay can switch up to 1A at 24VAC or 32V DC.
See also the Relay Expansion Module on page 12.
Status LED
Two flashes per ten seconds means the GP2 is logging.
Four flashes in a group indicate an error.
No flash means not logging or no battery power.
If the logger locks up, briefly press the Reset button.
After pressing Reset,4 LED flashes indicate that the GP2 is doing a warm reset.
Your program and data are preserved and logging will resume.
Hold Reset for more than 5 seconds until a second set of four LED flashes occur to
initiate a cold reset. This restores the factory-set default program and deletes all data
including any program which you may have added.
Analogue Channel Considerations
The differential analogue channels accept signals nominally
0 to 2.5V, with a full signal range of -1.4 to +2.7V.
The input range of custom sensor types can be set to auto-
range or to fixed ranges.
Ensure each voltage input on the (+) or (-) terminals is kept
within the permitted common mode range of -2.5V to +3V relative to logger GND.
Ensure these limits are not exceeded, particularly if powered sensors
are not powered by the GP2. The input signal may need to be
connected to the logger ground. If the signal is floating then place a
10kohm resistor between (-) and (SGND).
Sensor Power
Analogue channels have (PWR) terminals to allow power to be
switched to sensors. Sensors can be powered with an adjustable
warm-up time prior to taking a reading. The duration of the warm-up
period can be increased in multiples of one second.
The PWR power terminals associated with channels 1 to 12 can
supply a regulated or unregulated voltage.
On Bank A and B the GP2 can provide either 3V (±0.2mV) or 5 to
10.5V (unregulated). In addition 5V (±2%) and 12V (±0.4V) DC are available on

Install DeltaLINK Page 7
separate screw terminals. External power can also be switched to sensors via the
two internal relays and four extra relays of the Relay Expansion Module.
For SDI-12 sensors refer to the SDI-12 for GP2 User Manual.
The WET sensor PWR terminal also supplies 5.0 to 10.5 VDC unregulated and can
be used by another sensor if no WET sensor is connected.
Install DeltaLINK
To operate the DeltaLINK 3 software for the GP2 logger you need:
•A PC running Windows 10 or later
•One free USB or RS232 port
•Internet connection for software install
•GP2 to PC USB cable (supplied with GP2) or GP2 RS232 cable
The following are also useful
•Acrobat Reader for .pdf documents (free from www.adobe.com)
•Microsoft Excel 2013 or later for the Excel Dataset Import Wizard
1. Obtain DeltaLINK 3 from http://www.delta-t.co.uk.
2. Select Install DeltaLINK and follow the on-screen instructions.
3. Setup creates a desktop shortcut to DeltaLINK, and puts a Firmware Upgrade
program, a GP2 Calibration Certificate Generation program, and a Document
Library folder in the DeltaLINK 3 program group.
4. Install USB drivers for the cable. See https://www.ftdichip.com/Drivers/D2XX.htm
and FAQ “How do I set up my USB to RS232 Converter?” at www.delta-t.co.uk.
5. See the Release Notes in the Document
Library or at http://www.delta-t.co.uk.
Connect to GP2
1. Connect GP2 to the PC using the serial cable
provided.
2. Run DeltaLINK.
3. If DeltaLINK discovers your logger it displays
this in the status bar – see at right.
If the GP2 is not found select Connection
Details, Add,
Details, Detect
USB Port or select
the correct COM
port from the drop
down list.
See How to find your
USB COM port on
page 19.
If using networked loggers
see page 18.

Page 8 Sources of Help
Sources of Help
Online Help
Click Help from any DeltaLINK window (or press F1) in selected areas for context
sensitive information about DeltaLINK operation and functionality.
Select Start, All Programs, Delta-T Devices, DeltaLINK, Document Library.
Video Tutorials
Before attempting to program the GP2 watch the video tutorials –
at http://www.youtube.com/user/DeltaTDevices/videos.
These tutorials show the progressive development of a soil moisture sensor
program, followed by its use to control soil moisture using an irrigation control relay.
Run DeltaLINK at the same time and see if you can reproduce the instructions
along with the instructor.
Sensor Wiring Instructions
Wiring, installation and programming notes are provided for all sensors in the GP2
sensor library. This information appears in the Info Panel when a sensor is selected in
the Measurement section as shown in Step 2 below,
Left click on the wiring diagram to enlarge it.
If wiring up in the field it may help to have these printed - see steps 3 & 4.
1
2
3
4
Print (Preview)

Create a Simple Program in 6 Easy Steps Page 9
Create a Simple Program in 6 Easy Steps
Before you start you need to have DeltaLINK connected to your GP2 (see above),
or to the GP2 Simulator (see below).
1. Select Program
2. Select Change
3. Click on “Click to add new item, under Measurement
4. Select Temperature (or any other option from the list)
5. Select 2K Thermistor (or any other option)
6. Select Apply to send the program to your GP2 or the simulator
6
12
3
45

Page 10 The GP2 Simulator
You can now, if you wish, click on the Sensors tab and Read Now to watch real-
time readings, or select the Logger tab and Start Logging.
Note after step 5 above, the icon and label for the sensor appear in the
Measurement list in the left hand window. Also, detailed properties for the chosen
sensor appear in the right hand window, including the channel number, and, as we
saw earlier, the sensor connection instructions appear in the lower left Info Panel.
Under Recording the row labelled Individual reading indicates a rate of once per
hour. To change this, select the row – which will open the recording options on the
right hand panel, and choose your own Recording rate.
Note: Before you can change a program, stop logging and delete the logged data
(select Logger, Stop then Delete Records).
The GP2 Simulator
This simulates the weather and its effect on a
variety of sensors. Before sending a program
to your logger, try it out on the Simulator.
You can speed up time in the simulator to
check the behaviour of your program.
Restart the simulator and it will recreate the
same weather as before, from the same date.
This lets you see the effect of changes to a
program.
(Note the simulated weather uses an artificial
pattern and pseudo-random numbers, so don’t
rely on it for anything important.)
Connect to GP2 Simulator
1) Ensure DeltaLINK is connected to the GP2
Simulator as follows:-
a) Select Connection Details, Add and on the Connection Properties,
Connection tab set Connect to logger using to Simulator
b) On the Details tab set Select simulator model to GP2 simulator.
2) Click on OK, then OK again to connect
Graphs of solar radiation, rain, soil
moisture, salinity and temperature
generated by the DeltaLINK
Simulator

Sample Programs Page 11
Sample Programs
Several are provided. To use these go to the Program tab, click on the Change, select
Edit, Import Sample Program, and select one from the Open dialog.
Check Sensor Operation and Start Logging
1. Select the Sensors window and click the Read now button. The sensor readings
will continually refresh on a scrolling time graph.
2. Observe the sensor reading display in the scrolling charts and value panels while
adjusting sensor wiring and/or installation conditions.
3. Click the Cancel button when finished.
4. Once sensors are setup select the Logger tab and click Start to commence
logging.
Retrieve, View and Save Logged Data
1. Select the Dataset window. All stored
data in the logger will be retrieved and
displayed on the screen.
Click Refresh if required.
2. Select File, Save to save the data to a
dataset file on your PC.
3. Select File, Open to open and view a
previously saved dataset file.
4. Select File, Save As to change the file to
a .csv format for opening in Excel or use
the Dataset Import Wizard (see below).
Dataset Import Wizard
This helps import logged data files into MS
Excel spreadsheets.
To Install Dataset Import Wizard:
1. Download Dataset Import Wizard and
Dataset Import Wizard Release Notes
from www.delta-t.co.uk.
2. Follow the instructions in the Release Notes.
3. Dataset Import Wizard will report that it has
installed successfully, and will add Import
Dataset(s) to the Add-Ins ribbon in Excel 2010 (or to the Filemenu in earlier
versions).
4. To Start Dataset Import Wizard: Start Excel, select Import Dataset(s) and follow
the on-screen instructions.
Note: The GP2 memory can exceed the 65,000 row limit of Excel prior to Excel 2007.
If so, either update Excel, or import the data into multiple worksheets.

Page 12 Appendix 1: GP2 Relay Expansion Module
Appendix 1: GP2 Relay Expansion Module
Contents
This contains:
4 x mounting screws
4 x stand-off pillars
5 x link wire
1 x GP2 relay expansion PCB
Overview
The GP2 contains 2 relays, used as
switches. This expansion module provides 4 more, bringing the total to 6.
These can only be used with low voltage applications, not mains power.
DO NOT CONNECT 110V or 240V MAINS POWER TO THE RELAY
Each relay is protected from overvoltage and overcurrent using a resettable fuse
that will activate at 1A. The relays can handle up to 24V AC or 32V DC .
The relay expansion module fits onto the ‘EXPANSION BOARD’ position on the
GP2 PCB (as shown below).
Fitting Instructions
Warning: use anti-static procedures when handling the relay expansion
module
1. Screw in the 4 hex stand-off pillars (provided) into the 4 positions on the
GP2 PCB
2. Push the relay expansion module onto the GP2 PCB as shown above. The
header on the bottom of the module should fit into the ‘RELAY’ connector on
the GP2 PCB and the 4 screw holes should line up with the hex stand-off
pillars underneath.
3. Use the 4 screws (provided) to secure the PCB down on to the GP2.

Appendix 1: GP2 Relay Expansion Module Page 13
Relay Layout
Note: All ‘Pwr’ and ‘Ret’ terminals are joined together on the circuit board
Power should not exceed 1A at 32V DC or 26V AC
DO NOT CONNECT 110V or 240V MAINS POWER TO THE RELAY
How to Control the Relays
To instruct the relays to switch on or off you need to set up suitable ‘control’
conditions which meet your requirements. This is done using the DeltaLINK
program.
For more information on how to do this, please refer to the DeltaLINK online help.
You may also find the video tutorials helpful.
RELAY 6
RELAY 4
RELAY 3

Page 14 Appendix 1: GP2 Relay Expansion Module
Relay Wiring - Option 1:
Power supply NOT shared by all the relays
Using more than one power supply:To use the relays to switch in various
devices where each uses a separate, different power supply then connect the
positive wire directly from the selected power supply into the relay of choice.
Do not use the ‘Pwr’ and ‘Ret’ routing options on the board:
Relay terminals, applicable to relays 1 - 6
Pwr: Not used
A: Connect to power supply positive (+) output
B: Connect to pump positive (+) wire
Ret: Not used
Connect the pump negative (-) wire directly to the power supply negative
(–) terminal.
** DO NOT CONNECT 110V or 240V MAINS POWER TO THE RELAY **
Figure A1: Example wiring for switching on a solenoid
valve using the A and B terminals of relay number 4

Appendix 1: GP2 Relay Expansion Module Page 15
Relay Wiring – Option 2:
Power supply shared by all the relays:
If you want to switch in several devices that all share the same power supply, such
as pumps or solenoids, you can use the external power option and route the power
through to each relay via the ‘Pwr’ and ‘Ret’ terminals:
• External power in (‘PWR IN’):
Pwr: Connect to the +ive terminal on the power supply
Ret: Connect to the –ive terminal on the power supply
• Relay terminals, applicable to relays 1 - 6
Pwr: Link to the ‘A’ terminal next to it, e.g. ‘4A’
A: As above, linked to ‘Pwr’
B: Connect to pump +ive wire
Ret: Connect to pump –ive wire
Figure A2: Switching in a solenoid valve using a common power supply through
relay number 4
Figure A3: Switching in a solenoid valve using a common power supply through
relay number 1 on the main PCB.
*Warning: The relay only can take up to 1A at 24V AC or 32V DC.
** DO NOT CONNECT 110V or 240V MAINS POWER TO THE RELAY **

Page 16 Appendix 2: GP2 Network Cabling
Appendix 2: GP2 Network Cabling
Figure A4 A network of 7 GP2 loggers connected to a PC via a total 100m of
EXT/5w-xx extension cables and seven M12 5-way T-Piece connectors. This is
the maximum number of loggers and maximum cable length supported.

Appendix 2: GP2 Network Cabling Page 17
Figure A5 GP2 Network Cabling options
Notes
•A mini USB cable (not shown in Fig A5) - is required in order to configure
the modem at the logger end. This is supplied as standard with the Delta-T
modem solutions i.e. 3G-DLC-BX1/B and MD-3G-DLC.
•Seven is the maximum number of loggers which can be supported on a
combined network of GP1 (and/or DL6) and GP2 loggers.
WARNINGS
•Only one external power supply should ever be connected to the network.
Never connect more than one external battery.
•The GP2 network serial communication and power cable should not exceed
3A or 15V DC.
•Lead acid batteries must have a 2.5A in-line fuse in series with the +’ve wire
to protect the network cabling.
•Do not charge any external battery (including one in the modem box) via any
extension cables.
•These warnings apply to all GP2 and GP1 network cabling systems.
GP2-USB
GP2-RS232
GP2-NPT
GP1 cabling network
e.g. GP1-EXT-xx where xx=1, 5, 10 or 25m
GP2/GP1-M8
PC-UK
PC-EU
PC-US
PC-IN
PC-CN GP2-PSU GP2-NPC
MD-3G-DLC: (modem, antenna and cabling)
for use in M-ENCL-B2 enclosure
along with GP2 and 12V battery
+
EXT/5w-05
EXT/5w-01
EXT/5w-10
EXT/5w-25
RS232 + power
modem
Text message
cont rol
3G-DLC-BX1/B or
3G-DLC-BX1/SP

Page 18 Appendix 2: GP2 Network Cabling
DeltaLINK System Requirements
You need DeltaLINK version 3.2 or later.
Go to http://www.delta-t.co.uk/software/deltalink for the current version.
Creating a Network Connection
1. Connect your PC to the GP2 network, via the GP2 USB cable or GP2-
RS232 cable, or, if using a modem, via the cabling indicated in Figure A5..
2. Start DeltaLINK. Select Connection Details to display a window listing all
(known) logger connections. The first time you do this the list may be empty.
3. In the Connections dialog, click Add… to pop up the Connection
Properties dialog. See Figure A6.
Figure A6 Connections Properties
4. In Connect to logger using: select the communication method, e.g. Serial.
5. Select the Details tab and enter connection details e.g. COM3.
See also: How to Find your COM Port on page 19.
6. Select the Connection tab, tick the Networked check box, and enter the
serial number of the GP2 that you want to address.
7. Enter a descriptive Connection name, e.g. or “GP2 3-24 on COM3 (USB).
8. Click OK, and in the Connections dialog select the new connection and click
OK.
9. DeltaLINK will then open the connection in a new window.
10. Repeat the procedure for each logger on the network, with a unique
connection name for each.

Appendix 2: GP2 Network Cabling Page 19
Figure A7 Example showing how
DeltaLINK displays connections to GP2
loggers on the network connected to a PC on
COM Port 3
How to find your USB COM port
See also:How do I set up my USB to RS232 converter?
at https://www.delta-t.co.uk/product/gp2/#support
2
5
6
7
USB cable found
on COM8
8
Click to connect to
any logger on COM8
3
1
4
Click to create a
new connection
Start
here
Disconnect
USB cable
Reconnect
USB cable
Click to detect
USB port

Page 20 Appendix 3: Cable Expansion Lid
Appendix 3: Cable Expansion Lid
Note: The GP2 case has 9 cable glands for 3-6 mm diameter cables. Additional and/or
larger cables can be fitted using this expansion lid.
GP2-G5-LID
This GP2 lid has 5 general purpose cable
glands.
Each gland can accept either a cable with an
outer diameter of 3 to10mm diameter, or it can
take 2 cables of diameter 3 to 4.5mm - using a
gland insert with two holes.
See also: Appendix 7: Make sure the GP2 is properly sealed on page 24.
For larger cables separate
the inner and outer
sleeves and use only the
outer sleeve
When using the twin hole insert, ensure both holes
are used – if using only one cable, then a blanking
plug (or similar) must be put into the other hole.
Failure to do this will mean the enclosure is not
sealed, and may damage the insert.
Outer
sleeve
Inner
sleeve
Inner and
outer sleeve
combined
Twin hole
insert
3 to 10 mm
diameter
cables
3 to 4.5 mm
diameter
cables
Blanking
plugs
GP2
Fit the lid in place using a cross-head
cross-head screwdriver (not supplied).