Vaisala GMP252 User Manual
M211897EN-B
User Guide
Vaisala CARBOCAP
(R)
Carbon Dioxide Probe
GMP252
PUBLISHED BY
Vaisala Oyj
Street address: Vanha Nurmijärventie 21, FI-01670 Vantaa, Finland
Mailing address: P.O. Box 26, FI-00421 Helsinki, Finland
Phone: +358 9 8949 1
Fax: +358 9 8949 2227
Visit our Internet pages at www.vaisala.com.
© Vaisala 2016
No part of this manual may be reproduced,
published or publicly displayed in any form
or by any means, electronic or mechanical
(including photocopying), nor may its
contents be modified, translated, adapted,
sold or disclosed to a third party without
prior written permission of the copyright
holder. Translated manuals and translated
portions of multilingual documents are
based on the original English versions. In
ambiguous cases, the English versions are
applicable, not the translations.
The contents of this manual are subject to
change without prior notice.
Local rules and regulations may vary and
they shall take precedence over the
information contained in this manual.
Vaisala makes no representations on this
manual’s compliance with the local rules
and regulations applicable at any given
time, and hereby disclaims any and all
responsibilities related thereto.
This manual does not create any legally
binding obligations for Vaisala towards
customers or end users. All legally binding
obligations and agreements are included
exclusively in the applicable supply
contract or the General Conditions of Sale
and General Conditions of Service of
Vaisala.
This product contains software developed
by Vaisala or third parties. Use of the
software is governed by license terms and
conditions included in the applicable
supply contract or, in the absence of
separate license terms and conditions, by
the General License Conditions of Vaisala
Group.
Table of Contents
1. About This Document........................................................................................ 7
1.1. Documentation Conventions................................................................................ 7
1.2. Version Information............................................................................................... 7
1.3. Related Manuals..................................................................................................... 8
1.4. Trademarks............................................................................................................. 8
1.5. Patent Notice..........................................................................................................8
2. Product Overview................................................................................................9
2.1. Introduction to GMP252 .......................................................................................9
2.2. Basic Features and Options................................................................................10
2.3. Operating Principle of CO2 Measurement.......................................................... 11
2.4. Environmental Compensation.............................................................................12
2.4.1. Temperature Compensation......................................................................... 13
2.4.2. Pressure Compensation.................................................................................13
2.4.3. Background Gas Compensation...................................................................13
2.5. Probe Startup........................................................................................................14
2.6. Analog Output Overrange Behavior..................................................................14
2.6.1. Analog Output Overrange Example............................................................ 15
2.7. Safety.....................................................................................................................16
2.7.1. ESD Protection............................................................................................... 16
2.8. Regulatory Compliances......................................................................................16
3. Installation.............................................................................................................17
3.1. GMP252 Probe Dimensions................................................................................. 17
3.2. Recommended Installation..................................................................................17
3.3. Installation Accessories........................................................................................17
3.3.1. 243261SP Installation Flange........................................................................ 18
3.3.2. 243257SP Mounting Clips............................................................................. 19
3.4. Power Supply........................................................................................................19
3.5. Wiring................................................................................................................... 20
4. Vaisala Industrial Protocol..............................................................................21
4.1. Overview................................................................................................................ 21
4.2. Serial Interface Settings.......................................................................................21
4.3. Physical Interface..................................................................................................21
4.4. Connecting with a Computer............................................................................. 22
4.4.1. Installing the Driver for the USB Service Cable......................................... 23
4.5. Accessing Serial Commands from Modbus or Analog Mode......................... 23
4.6. Enabling Modbus Mode from Vaisala Industrial Protocol...............................24
4.7. Changing From Digital Output to Analog Output........................................... 25
4.8. Serial Commands.................................................................................................25
4.9. Device Information and Status...........................................................................28
4.10. Serial Line Output and Communication.............................................................31
4.11. Analog Output..................................................................................................... 39
4.12. Calibration and Adjustment...............................................................................44
4.13. Environmental Compensation Commands...................................................... 48
4.14. Other Commands................................................................................................ 55
5. Modbus...................................................................................................................57
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GMP252 User Guide M211897EN-B
6. Operating with MI70 Indicator.................................................................... 58
6.1. Overview of MI70 Support................................................................................. 58
6.2. Basic Display........................................................................................................ 58
6.3. Graphical Display.................................................................................................59
6.4. Main Menu............................................................................................................ 59
6.5. Connecting Probe to MI70 Indicator................................................................. 59
6.6. MI70 Indicator Parts............................................................................................60
6.7. Holding and Saving the Display........................................................................ 60
6.8. Recording Data.....................................................................................................61
6.9. Changing Environmental Compensation Settings with MI70 Indicator........62
6.10. Calibration and Adjustment with MI70 Indicator............................................ 63
6.10.1. 1-Point Adjustment with an MI70-Compatible Reference Probe............ 63
6.10.2. 1-Point Adjustment with a Reference Gas................................................. 64
7. Maintenance.........................................................................................................67
7.1. Cleaning................................................................................................................ 67
7.1.1. Chemical Tolerance....................................................................................... 67
7.2. Changing the Filter..............................................................................................68
7.3. Calibration and Adjustment............................................................................... 68
7.3.1. Calibration Setup.......................................................................................... 69
7.3.2.
Eect of Environmental Compensations...................................................69
7.3.3. Limits of Adjustment....................................................................................70
7.3.4. Adjustment Types.........................................................................................70
7.3.5. DRW244827SP Calibration Adapter............................................................71
8. Troubleshooting................................................................................................. 72
8.1. Problem Situations.............................................................................................. 72
8.2. Error Messages.....................................................................................................72
8.3. Analog Output Error State..................................................................................74
9. Technical Data.....................................................................................................75
9.1. GMP252
Specifications........................................................................................75
9.2. Spare Parts and Accessories.............................................................................. 78
9.3. GMP252 Probe Dimensions................................................................................ 78
9.4. 243261SP Mounting Flange Dimensions........................................................... 79
9.5. 243261SP Calibration Adapter Dimensions......................................................80
Appendix A:
Modbus Reference..........................................................................81
A.1. Function Codes..................................................................................................... 81
A.2. Modbus Registers................................................................................................. 81
A.2.1. Measurement Data......................................................................................... 81
A.2.2. Configuration Registers................................................................................82
A.2.3. Status Registers............................................................................................ 84
A.2.4. Device Identification Objects...................................................................... 84
A.3. Modbus Communication Examples...................................................................86
A.4. Filtering Factor.....................................................................................................88
Technical Support
........................................................................................................... 89
Warranty...........................................................................................................................89
Recycling..........................................................................................................................89
2
List of Figures
Figure 1 GMP252 Probe Parts........................................................................................... 9
Figure 2 Probe Cuvette with Mirror and Sensor Chips...............................................11
Figure 3 CO2 Measurement in the Measurement Cuvette....................................... 12
Figure 4 Example of Analog Output Overrange Behavior ......................................15
Figure 5 GMP252 Dimensions.......................................................................................... 17
Figure 6 Probe with 243261SP Installation Flange..................................................... 18
Figure 7 Probe in 243257SP Mounting Clips................................................................19
Figure 8 Example of analog output overrange behavior........................................ 43
Figure 9 MI70 Basic Display.............................................................................................58
Figure 10 MI70 Indicator Parts......................................................................................... 60
Figure 11 CO2 Reading with Tcomp and Pcomp on MI70 Screen.......................... 62
Figure 12 Probe Compensation Settings on MI70 Screen.........................................62
Figure 13 Opening the Filter............................................................................................. 68
Figure 14 DRW244827SP Calibration Adapter with Probe Inserted.......................71
Figure 15 GMP252 Dimensions......................................................................................... 78
Figure 16 243261SP Mounting Flange Dimensions..................................................... 79
Figure 17 243261SP Mounting Flange Dimensions, Cross Section......................... 79
Figure 18 243261SP Calibration Adapter Dimensions................................................80
3
GMP252 User Guide M211897EN-B
List of Tables
Table 1 Document Versions.............................................................................................. 7
Table 2 Related Documents.............................................................................................. 8
Table 3 Applicable Patents................................................................................................8
Table 4 Analog Output Overrange Clipping and Error Limits................................14
Table 5 M12 Male Connector...........................................................................................20
Table 6 Default Serial Interface Settings......................................................................21
Table 7 Basic Serial Commands.....................................................................................26
Table 8 Advanced Serial Commands............................................................................27
Table 9 ? Command.......................................................................................................... 28
Table 10 Errs Command.....................................................................................................28
Table 11 Help Command................................................................................................... 29
Table 12 Snum command.................................................................................................. 29
Table 13 System Command.............................................................................................. 30
Table 14 Time Command...................................................................................................30
Table 15 Vers Command....................................................................................................30
Table 16 Addr Command....................................................................................................31
Table 17 Close Command................................................................................................... 31
Table 18 Form Command................................................................................................... 31
Table 19 Output Parameters for Form Command...................................................... 33
Table 20 Modifiers for Form Command.........................................................................34
Table 21 Intv Command..................................................................................................... 35
Table 22 Open Command.................................................................................................. 35
Table 23 R Command..........................................................................................................36
Table 24 S Command..........................................................................................................36
Table 25 Sdelay Command............................................................................................... 36
Table 26 Send Command................................................................................................... 37
Table 27 Seri Command..................................................................................................... 37
Table 28 Smode Command............................................................................................... 38
Table 29 Amode Command.............................................................................................. 39
Table 30 Aover Command................................................................................................ 40
Table 31 Asel Command.................................................................................................... 43
Table 32 Adate Command................................................................................................ 44
Table 33 Atext Command..................................................................................................45
Table 34 Cdate Command.................................................................................................45
Table 35 Ctext Command..................................................................................................45
Table 36 CCO2 Command................................................................................................. 46
Table 37 Env Command.....................................................................................................49
Table 38 O2cmode Command...........................................................................................51
Table 39 Pcmode Command.............................................................................................52
Table 40 Rhcmode Command.......................................................................................... 53
Table 41 Tcmode Command.............................................................................................54
Table 42 Frestore Command.............................................................................................55
Table 43 Pass Command....................................................................................................55
Table 44 Reset Command................................................................................................. 56
Table 45 Default Modbus Serial Communication Settings....................................... 57
Table 46 Performance.........................................................................................................75
Table 47 Operating Environment.................................................................................... 76
Table 48 Inputs and Outputs.............................................................................................77
Table 49 Mechanics............................................................................................................. 77
Table 50 Supported Function Codes...............................................................................81
4
Table 51 Modbus Measurement Data Registers (Read-Only)..................................81
Table 52 Modbus Configuration Data Registers (Writable).....................................82
Table 53 Modbus Status Registers (Read-Only).........................................................84
Table 54 Device Identification Objects.......................................................................... 84
5
GMP252 User Guide M211897EN-B
6
1. About This Document
1.1. Documentation Conventions
Chapter 1 – About This Document
DANGER!
carefully at this point, death will follow.
WARNING!
carefully at this point, there is a risk of injury or even death.
CAUTION!
carefully at this point, the product could be damaged or important data could be lost.
Note highlights important information on using the product.
Tip gives information for using the product more eciently.
alerts you to a fatal hazard. If you do not read and follow instructions
alerts you to a serious hazard. If you do not read and follow instructions
warns you of a potential hazard. If you do not read and follow instructions
1.2. Version Information
Table 1 Document Versions
Document Code Date Description
M211897EN-B August 2016 Modbus status register values and
descriptions updated.
M211897EN-A May 2016 First version.
7
GMP252 User Guide M211897EN-B
1.3. Related Manuals
Table 2 Related Documents
Document Code Description
M211893EN
M211799EN
M211798EN
Vaisala CARBOCAP
GMP252 Quick Guide
Vaisala CARBOCAP
User Guide
Vaisala CARBOCAP
Quick Guide
(R)
Carbon Dioxide Probe
(R)
Carbon Dioxide Probe GMP251
(R)
Carbon Dioxide Probe GMP251
1.4. Trademarks
Vaisala
Windows
(R)
and CARBOCAP
(R)
is either a registered trademark or trademark of Microsoft Corporation in the
United States and other countries.
All other product or company names that may be mentioned in this publication are trade
names, trademarks, or registered trademarks of their respective owners.
(R)
are registered trademarks of Vaisala Oyj.
1.5. Patent Notice
This product is protected by the following patents and their corresponding national rights:
Table 3 Applicable Patents
Patent Issued By Patent Number
United States Patent and Trademark Oce US 5,827,438
US 6,177,673
European Patent Oce EP0776023
EP0922972
German Patent and Trade Mark Oce 69615635
Japan Patent Oce 4263285
Finnish Patent Oce 112005
105598
8
1
2 3 4 5
Chapter 2 – Product Overview
2. Product Overview
2.1. Introduction to GMP252
GMP252 is designed for CO2 measurement in demanding applications that require reliable
and accurate performance. The measurement range is 0 ... 10 000 ppmCO2 (measurements
can be carried out in the 10 000 ... 30 000 ppmCO2 range with reduced accuracy).
The probe is based on Vaisala’s patented 2nd generation CARBOCAP
equipped with Vaisala's Microglow infrared light source. The probe is easy to install with a
plug-in/plug-out M12 connection.
GMP252 is able to compensate for temperature, pressure and background gas. For
temperature compensation purposes, the probe includes an internal temperature sensor
that allows measurement compensation according to ambient temperature. As dust and
most chemicals do not
background gas can be compensated for, GMP252 can provide accurate and stable
measurements in a wide range of applications.
aect the measurement, and the eect of temperature, pressure and
(R)
technology and
Figure 1 GMP252 Probe Parts
1 5-pin M12 connector. For pinout, see 3.5. Wiring (page 20).
2 Probe name and orientation mark for Vaisala transmitter installations (front) and laser-
printed type label (back).
3 Probe body. Contains the main component board.
4
Measurement cuvette with optics and CARBOCAP
5 Filter (sintered, PTFE)
CAUTION!
inside the probe body.
Do not attempt to open the probe body. There are no user serviceable parts
(R)
CO2 sensor.
9
GMP252 User Guide M211897EN-B
2.2. Basic Features and Options
• CO2 measurement range 0 ... 10 000 ppmCO2.
• Measurement up to 30 000 ppmCO2 with reduced accuracy.
• Operating temperature range -40…+60 °C (-40...140 ºF).
(R)
• Vaisala CARBOCAP
• Measurement compensated for
The temperature compensation can be based on an integrated temperature sensor or
use a set temperature. Pressure and background gas parameters can be set to the
probe.
• Heating to avoid condensation on optical elements.
• Digital output with RS-485:
• Modbus RTU
• Vaisala Industrial Protocol
• Analog output:
• Current output (0 ... 20 mA or 4 ... 20 mA)
• Voltage output (0 ... 5 V or 0...10 V)
• Compatible with MI70 hand-held meter.
• Easy plug-in, plug-out.
CO2 sensor with excellent long-term stability.
eects of temperature, pressure, and background gas.
More Information
‣
GMP252
‣
Operating Principle of CO2 Measurement (page 11)
‣
Environmental Compensation (page 12)
‣
Modbus (page 57)
‣
Overview of MI70 Support (page 58)
Specifications (page 75)
10
1
2
3
Chapter 2 – Product Overview
2.3. Operating Principle of CO
Measurement
The Vaisala CARBOCAP
probe is a silicon-based, nondispersive
infrared (NDIR) sensor for the measurement
of gaseous carbon dioxide in air-like gases.
Figure 2 Probe Cuvette with Mirror and Sensor
Chips
1 Mirror
2 Cuvette
3 Sensor chips under TO5 package
2
(R)
sensor used in the
The sensitivity to carbon dioxide is based on absorption of infrared light at a characteristic
wavelength. During measurement, infrared light is routed through the cuvette that contains
the gas to be measured. A mirror
that measures the light intensity at a wavelength determined by a Fabry–Pérot
interferometer (FPI) and a band pass
The carbon dioxide measurement consists of two steps: first, the FPI is electrically tuned so
that its pass band coincides with the characteristic absorption wavelength of carbon dioxide
and the signal is recorded. Second, the pass band is shifted to a wavelength where no
absorption occurs in order to get a reference signal. The ratio of these two signals, one at
the absorption wavelength and the other at the reference wavelength, gives the fraction of
light absorption from which the carbon dioxide concentration is calculated. Measuring the
reference signal compensates the possible
due to dirt on optical surfaces, making the sensor very stable over time.
TO5 packages with hermetic windows are used to protect the sensor chips from moisture
and contamination. A heater chip is utilized to prevent condensation in normal operation.
reflects the light from the cuvette to a thermopile detector
filter.
eects of sensor aging and signal attenuation
11
1
2
3
4
6
7
5
GMP252 User Guide M211897EN-B
Figure 3 CO
Measurement Cuvette
1 Gold-plated mirror
2 Light absorbed by CO2 in the measured
gas
3 Hermetic window
4 Fabry-Perot interferometer
5 Light source (Microglow)
6 Hermetic window
7 Thermopile detector
Measurement in the
2
2.4. Environmental Compensation
When necessary, various environmental compensations can be applied to improve the CO
measurement accuracy of the probe.
The probe can compensate for the eects of the following parameters:
• Temperature
• Pressure
• Background gas oxygen (O2) content
• Background gas relative humidity (%RH)
The probe has an on-board temperature sensor that can be used to compensate for
temperature. Additionally, if the probe is integrated in a system that measures one or more
of the compensation parameters (T, P, RH, O2), they can be updated to the probe
continuously.
To apply an accurate relative humidity compensation, make sure that also the temperature
compensation and pressure compensation
environment.
configurations match the measurement
2
12
Chapter 2 – Product Overview
Compensation parameters are configured on the order form when ordering the probe, and
can later be updated using Vaisala Industrial Protocol or Modbus protocol.
You can also turn o any of the compensations. In that case, the probe uses the default
compensation value that is mathematically neutral for the probe’s internal compensation
model.
2.4.1. Temperature Compensation
The probe can measure the approximate temperature of the CARBOCAP
compensation, or use a
fixed setpoint. The temperature measurement is accurate enough to
(R)
sensor for
be useful for compensation, and is recommended for use unless a dedicated temperature
measurement is available and can be regularly updated to the probe. If the measurement is
made in a constant temperature, this
fixed temperature setpoint can be set as the
compensation value.
If temperature compensation is turned o, the probe uses the default value of +25 °C
(+77 °F).
When the probe is installed through a
outside the measuring environment, it is possible that temperature conduction from the
probe body and cable outside the measurement environment aects the temperature
compensation and decreases measurement accuracy.
flange and part of the probe and the cable is left
2.4.2. Pressure Compensation
The probe does not have on-board pressure measurement. However, a pressure reading
from an external source can be used as a setpoint value for compensation using Vaisala
Industrial Protocol or Modbus.
If pressure compensation is turned o, the probe uses the default compensation value of
1013 hPa.
2.4.3. Background Gas Compensation
The probe does not have on-board oxygen or relative humidity measurement. However,
oxygen and relative humidity readings from an external source can be used as setpoint
values for compensation using Vaisala Industrial Protocol or Modbus. The default setpoint
values are as follows:
• Oxygen concentration: 0 %O2 or 21 %O
• Relative humidity: 0 %RH or 50 %RH
If background gas compensations are turned
In practice, when CO2 is measured at a ppm level, O2 and RH compensations have a very
eect on the accuracy of the measurement.
small
2
o, the probe uses the value 0 % for both.
13
GMP252 User Guide M211897EN-B
2.5. Probe Startup
When powered on, the probe starts up within 12 seconds. Measurements from the outputs
(digital and analog) become available during this time but note that they will only reach
specified accuracy after a 2-minute warm-up period. For this reason, you should design your
system so that it does not rely on measurements from the probe during this time. When the
probe is in analog output mode, the probe remains in an error state during the start-up
phase until measurement output becomes available.
Specifically note that the CO2 reading will rise to the correct reading as the sensor’s
infrared emitter achieves operation temperature.
2.6. Analog Output Overrange Behavior
Analog output of the probe has a defined behavior when the values measured by the probe
are outside the scaled analog output range. At first, the output is clipped when the
measurement exceeds a set limit (the measurement continues, but the output does not
change from the clipped value).
When the measurement exceeds the second limit (error limit), the analog output switches to
the error state
defined for the output. The table below lists the clipping and error limits and
default error state outputs for the analog voltage and current outputs.
Table 4 Analog Output Overrange Clipping and Error Limits
Output voltage / current Clipping Limit Error Limit Default Error State Output
0 ... 5 V >5 % >10 % 0 V
0 ... 10 V >1 % >10 % 0 V
0 ... 20 mA >5 % >10 % 23 mA
4 ... 20 mA >5 % >10 % 2 mA
The same clipping and error limits are applied when the measured value drops back to the
scaled range: at
first the output returns to the clipped value from the error state, and then to
normal output.
Clipping and error state limits
the limits are 1 % and 10 %, and for 0 ... 5 V output the limits are 5 % and 10 %.
dier for 0 ... 10 V and 0 ... 5 V outputs. For 0 ... 10 V output
14
More Information
Output
voltage (V)
Time
0.00
In error state at
>2200 ppm
(2000 ppm + 10%)
5.00
5.25
Clipped at
2100 ppm
(2000 ppm + 5%)
Regular
measurement
Output clipping limit
Error level
‣
Analog Output Error State (page 74)
2.6.1. Analog Output Overrange Example
Consider a probe with 0 ... 5 V output, scaled to 0 ... 2000 ppmCO2.
Chapter 2 – Product Overview
• When the measured CO
rises above 2000 ppmCO2, the output rises above 5 V.
2
• The output keeps rising until the measurement is 2100 ppmCO2, at which point the
probe outputs 5.25 V.
• If the CO2 level rises above 2100 ppmCO2, the output still remains at 5.25 V.
• If the CO2 level rises above 2200 ppmCO2, the output enters the error state, which is 0
V for the 0 ... 5 V output.
Figure 4 Example of Analog Output Overrange Behavior
This example uses output scaled to 0 ... 5 V and 0 ...2000 ppmCO2, error level set to 0 V,
clipping set to 5 % overrange, and error limit set to 10 % overrange. CO2 concentrations
(ppm) are indicated for the clipping point and error limit point.
This overrange and error behavior is
readings of the digital outputs.
You can change the analog output overrange behavior using the aover command.
specific to the analog output, and does not aect the
15
GMP252 User Guide M211897EN-B
2.7. Safety
The probe delivered to you has been tested for safety and approved as shipped from the
factory. Note the following precautions:
WARNING!
been exposed to dangerous contamination, and is safe to handle without special
precautions.
CAUTION!
lead to malfunction.
CAUTION!
inside the probe body.
When returning a product for calibration or repair, make sure it has not
Do not modify the unit. Improper modification can damage the product or
Do not attempt to open the probe body. There are no user serviceable parts
2.7.1. ESD Protection
Electrostatic Discharge (ESD) can cause immediate or latent damage to electronic circuits.
Vaisala products are adequately protected against ESD for their intended use. However, it is
possible to damage the product by delivering electrostatic discharges when touching an
exposed contact on the product.
To make sure you are not delivering high static voltages yourself, avoid touching the pins on
the M12 connector.
2.8. Regulatory Compliances
The probe is in conformity with the provisions of the following EU directives:
• RoHS Directive
• EMC Directive
Conformity is shown by compliance with the following standards:
• EN 50581: Technical documentation for the assessment of electrical and electronic
products with respect to the restriction of hazardous substances.
• EN 61326-1: Electrical equipment for measurement, control, and laboratory use – EMC
requirements – Generic environment.
• EN 55022: Information technology equipment – Radio disturbance characteristics –
Limits and methods of measurement.
16
3. Installation
12 mm 76 mm 42 mm
130 mm, Ø 25 mm
3.1. GMP252 Probe Dimensions
The dimensions are given in millimeters (mm).
Chapter 3 – Installation
Figure 5 GMP252 Dimensions
3.2. Recommended Installation
The probe can be installed in an environment with an operating temperature range -40 ...
+60 °C (-40 ... +140 °F). Make sure the probe is in a location that represents the
measurement environment properly.
The 5-pin male M12 connector on the probe provides an easy plug-in/plug-out connection to
a compatible cable.
3.3. Installation Accessories
The probe can be installed through a surface using the optional
product code 243261SP, or attached for example to a wall with the optional clip accessory
(two-clip set, Vaisala product code 243257SP.
More Information
‣
Spare Parts and Accessories (page 78)
flange accessory (Vaisala
17
1
2
3
GMP252 User Guide M211897EN-B
3.3.1. 243261SP Installation Flange
The optional flange accessory is used to install the probe body through a wall or other
surface.
Figure 6 Probe with 243261SP Installation Flange
1 4 Phillips head screws (included)
2 Installation flange (diameter 60 mm) with four Ø 4.2 mm screw holes
3 Gasket ring
Leaving part of the probe body and the cable outside the measurement environment can
cause heat conduction that aects the temperature compensation and measurement
accuracy.
More Information
‣
243261SP Mounting Flange Dimensions (page 79)
18
Ø 4.2 mm
Chapter 3 – Installation
3.3.2. 243257SP Mounting Clips
The optional mounting clips (set of two clips) are used to hold the probe in place for
example on a wall or other surface. Each clip base attaches to the installation surface with
one screw (screw hole Ø 4.2 mm).
Figure 7 Probe in 243257SP Mounting Clips
3.4. Power Supply
The supply voltage range of the probe is 12 ... 30 VDC with the digital output option. If the
analog output is used, the supply voltage range is 12 ... 30 VDC for voltage output and
20 ... 30 VDC for current output.
Typical power consumption is less than 0.4 W in continuous operation, and the maximum is
0.5 W.
19
1
5
3
4
2
GMP252 User Guide M211897EN-B
3.5. Wiring
Table 5 M12 Male Connector
Pin# Function Note Cable 223263SP
Wire Colors
1 Power in • With digital output: 12 ... 30 VDC
• With voltage output: 12 ... 30 VDC
• With current output: 20 ... 30 VDC
Typical average power consumption <0.4 W, maximum
0.5 W.
2 RS-485-
or voltage
output
3 GND – Blue
4 RS-485 +
or current
output
5 Output control Connecting pin #5 to GND (pin #3) forces the probe to
Voltage:
0 ... 5 VDC or 0 ... 10 VDC (default analog output scaling)
Current:
0 … 20 mA or 4 ... 20 mA (default analog output scaling)
analog output mode. If an analog output configuration
has not been selected, default 0...10 VDC and 4...20 mA
scalings are used.
If pin #5 is not connected, the analog or digital output
selected when ordering or set later through
configuration is used.
Brown
White
Black
Gray
20
Note that the probe always remains in analog mode when pin #5 is connected to pin #3,
and cannot be switched to digital output in this wiring option.
Chapter 4 – Vaisala Industrial Protocol
4. Vaisala Industrial Protocol
4.1. Overview
RS-485 line of the probe provides an implementation of the Vaisala Industrial Protocol that
can be used for service and configuration use, or for interfacing with the system to which
the probe is integrated. The protocol is a plaintext protocol suitable for use both by human
operators and automated systems.
4.2. Serial Interface Settings
Table 6 Default Serial Interface Settings
Property Description/Value
Bit rate 19200
Parity None
Data bits 8
Stop bit 1
Flow control None
4.3. Physical Interface
The physical interface is a non-isolated 2-wire interface. The data lines are RS-485 D- and
RS-485 D+. Ground is shared with power supply. The connector is a 5-pin male M12.
More Information
‣
Wiring (page 20)
21
GMP252 User Guide M211897EN-B
4.4. Connecting with a Computer
• Vaisala USB service cable (order code 242659)
• Computer with:
• Windows operating system
• Terminal application (for example PuTTy, available from www.vaisala.com/
software)
• Free USB port
• Driver for Vaisala USB service cable installed (available on the cable installation
media and at www.vaisala.com/software)
The steps below describe how to connect to the probe using the PuTTY terminal application
for Windows and a USB computer connection cable. Connecting with a computer allows you
to
configure and troubleshoot your probe using serial line commands.
1. If you have not used the Vaisala USB cable before, install the driver before attempting
to use the cable.
2. Connect the USB serial interface cable between your computer and the M12 connector
of the probe.
3. Start the PuTTY application.
4. Select Connection > Serial & USB and check that the correct COM port is selected in
the Serial or USB line to connect to
field. If you are using the PuTTY terminal
application supplied by Vaisala, you can press the USB Finder button to open the
Vaisala USB Instrument Finder program.
5. Check that the other serial settings are correct for your connection, and change if
necessary. Flow control should be set to None unless you have a reason to change it.
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Chapter 4 – Vaisala Industrial Protocol
6. Select Terminal. Use the following settings:
• Local Echo
Select Force on. This setting ensures that your typing is shown on the session
window.
• Send line ends with line feeds (CR+LF)
Set to Selected. This setting ensures that all text lines remain visible on the
session window.
7. To open the connection window and start using the serial line, select Open.
If PuTTY is unable to open the serial port you selected, it shows you an error message
instead. If this happens, restart PuTTY and check the settings.
More Information
‣
Serial Interface Settings (page 21)
‣
Installing the Driver for the USB Service Cable (page 23)
4.4.1. Installing the Driver for the USB Service Cable
Before taking the USB service cable into use for the
USB driver on your computer (requires Windows). When installing the driver, you must
accept any security prompts that may appear.
1. Check that the USB service cable is not connected. Disconnect the cable if you have
already connected it.
2. Insert the media that came with the cable, or download the latest driver from
www.vaisala.com/software.
3. Run the USB driver installation program (setup.exe), and accept the installation
defaults. The installation of the driver may take several minutes.
4. After the driver has been installed, connect the USB service cable to a USB port on your
computer. Windows will detect the new device, and use the driver automatically.
5. The installation has reserved a COM port for the cable. Verify the port number, and the
status of the cable, using the Vaisala USB Instrument Finder program that has been
installed in the Windows Start menu. Windows will recognize each individual service
cable as a
port in the settings of your terminal program.
dierent device, and reserve a new COM port. Remember to use the correct
first time, you must install the provided
4.5. Accessing Serial Commands from Modbus or Analog Mode
1. Connect the USB cable to your PC and start the terminal application as instructed in
4.4. Connecting with a Computer (page 22).
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GMP252 User Guide M211897EN-B
2. Start a new terminal session using the default serial settings.
3. Keep the Enter key pressed down and connect the probe to the USB cable. When the
probe is powered on (connected to your PC with the USB cable), you must send five
carriage returns (Enter key presses) within 0.7 seconds to force the probe to serial
command mode. The probe model information appears in the terminal application
when the mode has been succesfully changed, and Vaisala Industrial Protocol
commands are available for use.
4. To test the connection, enter for example the ? command. If the mode change failed,
close the terminal application, disconnect the probe from the USB cable, and repeat
step 2 and step 3.
5. To keep the serial mode in use (forced serial mode access is temporary and switches
at reset), select a serial output option (stop/run/poll) with the smode command.
Note that the probe always remains in analog mode when pin #5 is connected to pin #3,
and cannot be switched to digital output in this wiring option.
More Information
‣
Serial Interface Settings (page 21)
‣
Enabling Modbus Mode from Vaisala Industrial Protocol (page 24)
4.6. Enabling Modbus Mode from Vaisala Industrial Protocol
If you need to switch from Vaisala Industrial Protocol to Modbus mode, you must
the following settings:
• Serial line operating mode
• Modbus address
• Serial line settings (bit rate, parity, stop and data bits)
configure
o
1. Connect the USB cable to your PC and start the terminal application as instructed in
4.4. Connecting with a Computer (page 22).
2. Set the serial mode to Modbus with the smode command:
smode modbus
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Chapter 4 – Vaisala Industrial Protocol
3. Set the Modbus address to 240 with the addr command:
addr 240
4. Set the serial line settings to 19200/N/8/2 with the seri command:
seri 19200 N 8 2
5. Power
configuration is available at the next restart.
More Information
‣
Accessing Serial Commands from Modbus or Analog Mode (page 23)
o (disconnect) the probe or reset with the reset command. The new
4.7. Changing From Digital Output to Analog Output
1. Set up a terminal connection as instructed in 4.4. Connecting with a Computer
(page 22).
2. Change the mode from digital to analog with the smode serial command: smode
analog.
3. Reset the probe (disconnect and reconnect the cable or use the reset serial command)
to power on in analog output mode.
More Information
‣
Accessing Serial Commands from Modbus or Analog Mode (page 23)
4.8. Serial Commands
The notation <cr> refers to the carriage return control character, which you can send in a
terminal application by pressing enter on your keyboard. Before entering commands, send a
<cr> to clear the command
You can enter the commands in uppercase or lowercase. In the command examples, the
keyboard input by the user is in bold type.
Table 7 (page 26) lists the basic serial commands that are available by default. To access
advanced serial commands (listed in Table 8 (page 27)), enter the command pass 1300.
buer.
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GMP252 User Guide M211897EN-B
Table 7 Basic Serial Commands
Command Description
Device information and status
?
??
errs
help
snum
system
time
vers
Serial line output and communication
close
form [modifier string]
intv [0 ... 255 s/min/h]
open [address]
Show probe information.
Show probe information (will respond in POLL mode).
Show currently active errors.
Show list of currently available serial commands.
Show probe serial number.
Show probe firmware information.
Show probe operation hours and uptime.
Show probe firmware version.
Close connection to probe (POLL mode)
Show or set output format.
Set continuous output interval for R command.
Open connection to probe in POLL mode.
r
s
sdelay [0 ... 255]
send
seri [baud data stop
parity]
smode [mode]
Environmental compensation
env
Adjustment information
adate
atext
Other commands
Start the continuous outputting.
Stop the continuous outputting.
Show or set serial line transmission delay in milliseconds.
Output a single measurement message.
Show or set the serial interface settings.
Show or set startup serial mode: RUN, STOP, or POLL.
Show or set environmental parameters.
Show CO2 factory adjustment date.
Show CO2 factory adjustment information.
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Command Description
Chapter 4 – Vaisala Industrial Protocol
reset
pass [1300]
Reset the probe.
Access advanced serial commands.
Table 8 Advanced Serial Commands
Command Description
Serial line output and communication
addr [0 … 254] Show or set probe address.
Analog output
amode
aover
asel
Calibration and adjustment
cco2
Show or set analog output mode (analog output limits and error level).
Show or set analog output overrange and clipping behavior.
Show or set analog output parameter and scaling.
Adjust CO2 measurement gain and oset.
cdate
ct
ctext
Environmental compensation
o2cmode
pcmode
rhcmode
tcmode
Other commands
frestore
Show or set calibration date.
Adjust temperature measurement oset.
Show or set calibration information.
Show or set oxygen compensation mode.
Show or set pressure compensation mode.
Show or set humidity compensation mode.
Show or set temperature compensation mode.
Restore probe to factory settings.
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