Delta OHM TP32MTT.03 User manual

TP32MTT.03 - TP32MTT.03.1
TP32MTT.03 - TP32MTT.03.1
PROBES FOR SOIL THERMAL PROFILE MEASUREMENT
The temperature probe TP32MTT.03 is equipped with seven Pt100 1/3 DIN
sensors for the measurement of temperature at depth: +5 cm, 0, -5 cm, -10
cm, -20 cm, -50 cm, -1 m with respect to the soil level, according to the
indications of the World Meteorological Organization (WMO).
The probe TP32MTT.03.1 is equipped with six Pt100 1/3 DIN sensors for the
measurement of temperature at depth: +5 cm, 0, -5 cm, -10 cm, -20 cm, -50
cm with respect to the soil level.
The breglass tube ensures a perfect impermeability and a high thermal
insolation along the vertical axis.
The RS485 digital output with MODBUS RTU protocol allows the use of
even very long connection cables. It can be connected to the datalogger
HD32MT.1 and HD32MT.3, or to any other datalogger with RS485 MODBUS
RTU input.
The M12 connector present on the hand grip of the probe allows an easy
connection of the cable. Cable length (optional) 2, 5 or 10 m, with open
wires at the end.
Power supply 6…30 Vdc.
TECHNICAL SPECIFICATIONS
Sensors Pt100 1/3 DIN
Resolution 0.01 °C
Accuracy ± 0.1 °C @ 0 °C
Working temperature Stem: -40…-125 °C
Hand grip: -40...+85 °C
Temperature drift 0.003 %/°C @ 20 °C
Power supply 6…30 Vdc
Consumption 5 mA @ 12 Vdc
Output RS485 with MODBUS-RTU protocol
Connection 8-pole M12 male connector
Cable Optional, with 8 poles with length of 2, 5 or 10m (to
be dened at the order) with open wires at the end.
Protection Degree IP 68
Fig. 2: installation
Indicate the presence of the probe during the maintenance operations of
the soil (e.g. lawn mowing, ploughing, mechanized harvesting, etc.).
To remove the probe from the soil, insert a pin into the Ø8mm hole at the
top of the handle and pull it upwards. Remove the probe vertically, avoiding
its inclination during extraction to avoid damaging the stem.
Connect the M12 connector as shown in Fig 3 and 4.
On request, 5 or 10 m standard cables with 8-pole M12 female connector
are available (other lengths available on request).
Connector
numbering Function Colour
1 Negative power supply Black
2 Positive power supply Red
3 Not connected
4 RS485 A/- Brown
5 RS485 B/+ White
6 Not connected
7 Not connected
8 Not connected
Fig. 3: connections
Fig. 1: dimensions of the probe TP32MTT.03 (mm)
INSTALLATION
By means of an accessory, perform a hole into the soil deep enough to
accommodate the stem of the probe. Never use the probe to make the
hole in the soil, to avoid mechanical damage to the probe itself.
Once the hole has been performed in the soil, insert the stem of the probe
so that the indicator of the zero level is in correspondence with the surface
of the soil. The probe must be stable in a vertical position.
After the introduction of the probe into the hole, ll in the empty spaces
between the soil and the stem of the probe with some soil made powder.
To obtain accurate measurements, the soil should be in contact with the
stem.
Groove to apply the ag
indicating placememt position
Hole Ø 8mm for the introduction of a
pin for the extraction of the probe
Soil level indication on the
stem of the probe
Soil level
Probe M12 male
connector
Cable CPM12-8P...
Hole Ø 8mm for the introduction of a
pin for the extraction of the probe
Soil level indication on the
stem of the probe
Soil level
TP32MTT.03 - TP32MTT.03.1

Fig. 4: RS485 connection
SETTING OF RS485 COMMUNICATION PARAMETERS WITH A STANDARD
COMMUNICATION PROGRAM
Before connecting the probe to the RS485 network you must assign an
address and set the communication parameters, if dierent from the factory
preset.
The parameter setting is performed by connecting the probe to the PC
according to one of the following two ways:
A. By using the optional cable CP24, with built-in RS485/USB converter.
In this connection mode, the probe is powered by the USB port of the
PC. To use the cable it is necessary to install the USB drivers in the PC.
B. By using the supplied 8-pole M12 female connector or the optional
cable CPM12-8P ... and a RS485/USB or RS485/RS232 generic converter.
In this connection mode the probe should be powered separately. If
RS485/USB converter is used it is necessary to install the relative USB
drivers in the PC.
Notes on the installation of unsigned USB drivers: before installing unsigned
USB drivers into Windows operating systems 7 and 8, it is necessary to restart
the PC disabling the driver signature request. If the operating system is 64-
bit, even after installation, it is necessary to disable the request of the driver
signature every time the PC is restarted. Disabling is not necessary if the CP24
cable is used.
PROCEDURE FOR SETTING THE PARAMETERS:
1. Start while the sensor is not powered (if the CP24 cable is used,
disconnect one end of the cable).
2. Start a serial communication program, HyperTerminal for example.
Set the Baud Rate to 57600 and set the communication parameters
as follows (the instrument is connected to a COM type port):
Data Bits=8, Parity=None, Stop Bits=2
In the program, set the number of the COM port to which you connect
the probe.
3. . Switch the sensor on (when using the CP24 cable, connect both
ends).
4. Wait until the probe transmits the & character, then send (within 10
seconds from probe power on) the command @ and press Enter.
Note: if the probe does not receive the @ command within 10 seconds
from power on, the RS485 MODBUS mode is automatically activated.
In such a case, it is necessary to switch o and power on the probe
again.
5. Send the command CALUSERON.
Note: the CALUSERON command is disabled after an inactivity of 5
minutes.
6. Send the following serial commands to set the RS485 MODBUS
parameters:
Command Reply Description
CMAnnn &| Set address RS485 to nnn
Ranging from 1 to 247. Preset on 1
CMBn &| Set RS485 Baud Rate: n=0 ⇒9600, n=1 ⇒19200
Preset on 1 ⇒19200
CMPn &| Set RS485 transmission mode (data bits, parity, stop bits):
n=0 ⇒8N1, n=1 ⇒8N2, n=2 ⇒8E1
n=3 ⇒8E2, n=4 ⇒8O1, n=5 ⇒8O2
Preset on 2 ⇒8E1
CMWn &| Set receiving mode after RS485 transmission:
n=0 ⇒Violate protocol and go in Rx mode right after Tx
n=1 ⇒Respect protocol and wait 3.5 characters after Tx
Preset on 1 ⇒Respect the protocol
7. It is possible to check the settings of the parameters by sending the
following commands:
Command Reply Description
RMA Address Read RS485 address
RMB Baud Rate
(0,1)
Read RS485 Baud Rate: 0 ⇒9600, 1 ⇒19200
RMP Tx Mode
(0,1,2,3,4,5)
Read RS485 transmission mode:
0 ⇒8N1, 1 ⇒8N2, 2 ⇒8E1, 3 ⇒8E2, 4 ⇒8O1, 5 ⇒
8O2
RMW Rx Mode
(0,1)
Read reception mode after RS485 transmission:
0 ⇒Violate the protocol and go in Rx mode right
after Tx
1 ⇒Respect the protocol and wait 3.5 characters
after Tx
Note: the command CAL USER ON is not required for reading the settings.
Termination Termination
Other sensors with
RS485 output
PLC, datalogger or
converter RS485/USB
or RS485/RS232 for PC
Probe M12
male connector Cavo CPM12-8P...
Shield
White
Brown
Black
Power supply
6...30 Vdc
Red
Probe M12 connector Cable CP24
Probe M12 connector Cable CPM-8P... Power supply
Red
Black
Brown
White

OPERATING MODE
The probe enters RS485 MODBUS-RTU mode after 10 seconds from power on.
During the rst 10 seconds from power on, the probe does not respond to any
request from the MODBUS master unit. After 10 seconds, it is possible to send
MODBUS requests to the probe.
READING THE MEASUREMENTS
In MODBUS mode, it is possible to read, through the function code 04h
(Read Input Registers), the measured values and the status of the probe. The
following table lists the available MODBUS Input Registers:
MODBUS INPUT REGISTERS
Register
Number
Register
Address Datum Format
1 0
Temperature in °C at -1 m from the soil [x100]
Note: the value has no meaning for the probe
TP32MTT.03.1
16-bit integer
2 1 Temperature in °C at -50 cm from the soil [x100] 16-bit integer
3 2 Temperature in °C at -20 cm from the soil [x100] 16-bit integer
4 3 Temperature in °C at -10 cm from the soil [x100] 16-bit integer
5 4 Temperature in °C at -5 cm from the soil [x100] 16-bit integer
6 5 Temperature in °C at the soil level [x100] 16-bit integer
7 6 Temperature in °C at +5 cm from the soil [x100] 16-bit Integer
8 7
Temperature in °F at -1 m from the soil [x100]
Note: the value has no meaning for the probe
TP32MTT.03.1
16-bit Integer
9 8 Temperature in °F at -50 cm from the soil [x100] 16-bit Integer
10 9 Temperature in °F at -20 cm from the soil [x100] 16-bit Integer
11 10 Temperature in °F at -10 cm from the soil [x100] 16-bit Integer
12 11 Temperature in °F at -5 cm from the soil [x100] 16-bit Integer
13 12 Temperature in °F at the soil level [x100] 16-bit Integer
14 13 Temperature in °F at +5 cm from the soil [x100] 16-bit Integer
Note: in case of measurement error -9999 is returned.
READING THE ERROR CONDITIONS
The function code 03h (Read Holding Registers) allows to read the r16-bit
egister number 3 (address 2) containing information on any error status of
the probe.
The bits of the register indicate the error condition according to the following
correspondence:
Bit Description
0…8 Functional error with the circuit board or error in the calibration data.
9 Sensor measurement error at -1 m
10 Sensor measurement error at -50 cm
11 Sensor measurement error at -20 cm
12 Sensor measurement error at -10 cm
13 Sensor measurement error at -5 cm
14 Sensor measurement error at 0 cm
15 Sensor measurement error at +5 cm
The register is cleared after reading. If the error condition persists, then the
error code is restored.
ORDERING CODES
TP32MTT.03: Temperature probe equipped with seven Pt100 1/3 DIN
sensors for the measurement of temperature at depth: +5 cm, 0, -5
cm, -10 cm, -20 cm, -50 cm, -1 m with respect to the ground level,
according to the indications of the WMO. RS485 digital output with
MODBUS-RTU protocol. 8-pole M12 male connector. Power supply
6…30 Vdc. The CPM12-8P… cable must be ordered separately.
TP32MTT.03.1: Temperature probe equipped with six Pt100 1/3 DIN
sensors for the measurement of temperature at depth: +5 cm, 0, -5
cm, -10 cm, -20 cm, -50 cm with respect to the ground level, according
to the indications of the WMO. RS485 digital output with MODBUS-
RTU protocol. 8-pole M12 male connector. Power supply 6…30 Vdc.
The CPM12-8P… cable must be ordered separately.
CP24: PC connecting cable for the conguration of the MODBUS
parameters. With built-in RS485/USB converter. 8-pole M12 connector
on probe side and USB A-type connector on the PC side.
CPM12-8P.2: 8-pole cable. Length 2 m. 8-pole M12 connector at one side,
open wires on the other side.
CPM12-8P.5: 8-pole cable. Length 5 m. 8-pole M12 connector at one side,
open wires on the other side.
CPM12-8P.10: 8-pole cable. Length 10 m. 8-poles M12 connector at one
side, open wires on the other side.
TP32MTT.03A: Accessory to perform the hole in the soil to insert the
probe.
TP32MTT.03B: Accessory for signaling the presence of the probe.