PICO PT-104 User manual

Copyright 2005-9 Pico Technology Ltd. All rights reserved.
PT-104
User's Guide
pt104.en-5
Thermistor Converter

PT-104 User's GuideI
Copyright 2005-9 Pico Technology Ltd. All rights reserved.pt104.en
Contents
.....................................................................................................................................11 Introduction
...........................................................................................................................................1
1 Overview
...........................................................................................................................................2
2 Safety warning
...........................................................................................................................................3
3 Legal information
.....................................................................................................................................42 Product information
...........................................................................................................................................4
1 Specifications
...........................................................................................................................................4
2 Installing the driver
...........................................................................................................................................5
3 Connection
...........................................................................................................................................8
4 Background on PRTs
.....................................................................................................................................103 Driver information
...........................................................................................................................................10
1 Introduction
...........................................................................................................................................11
2 pt104_open_unit
...........................................................................................................................................11
3 pt104_close_unit
...........................................................................................................................................11
4 pt104_poll_driver
...........................................................................................................................................12
5 pt104_get_cycle
...........................................................................................................................................12
6 pt104_set_channel
...........................................................................................................................................13
7 pt104_set_mains
...........................................................................................................................................13
8 pt104_get_value
...........................................................................................................................................14
9 pt104_get_version
...........................................................................................................................................14
10 pt104_get_unit_info
...........................................................................................................................................14
11 pt104_get_driver_version
...........................................................................................................................................15
12 pt104_labview
...........................................................................................................................................15
13 Windows XP (SP2)/Vista
...........................................................................................................................................15
14 Linux
.....................................................................................................................................164 Writing your own programs
...........................................................................................................................................16
1 C / C++
...........................................................................................................................................17
2 Delphi
...........................................................................................................................................17
3 Excel
...........................................................................................................................................17
4 LabVIEW
...........................................................................................................................................18
5 Visual Basic
...........................................................................................................................................18
6 Agilent VEE
.....................................................................................................................................195 Technical reference
...........................................................................................................................................19
1 Serial port settings
...........................................................................................................................................19
2 Serial port connections
...........................................................................................................................................20
3 Protocol information
...........................................................................................................................................22
4 Modem operation
...........................................................................................................................................22
5 Lookup table
..............................................................................................................................................28
Index

Introduction 1
Copyright 2005-9 Pico Technology Ltd. All rights reserved. pt104.en
1 Introduction
1.1 Overview
The PT-104 is a four-channel, high-resolution
temperature converter for use with PT100 and PT1000
type sensors. It can be used to measure temperature,
resistance and voltage.
In PT100/PT1000/resistance mode, the unit uses a four-
wire circuit.
In voltage mode, the input connector can be treated as
a differential input with ground, or two single-ended
inputs. Both inputs must be 0 V or above, though it
does not matter which input has the higher voltage. For
the 115 mV range, the accuracy may vary by 2%, and
the temperature coefficient will be 100 ppm/°C.

PT-104 User's Guide2
Copyright 2005-9 Pico Technology Ltd. All rights reserved.pt104.en
1.2 Safety warning
We strongly recommend that you read the general safety information below before
using your product for the first time. If the equipment is not used in the manner
specified, then the protection provided may be impaired. This could result in damage
to your computer and/or injury to yourself or others.
Maximum input range
The PT-104 is designed to measure voltages in the range 0 to +2.5 V. Any voltages in
excess of ±30 V may cause permanent damage to the unit.
Mains voltages
Pico products are not designed for use with mains voltages. To measure mains we
recommend the use of a differential isolating probe specifically designed for such
measurements.
Safety grounding
The ground of every product is connected directly to the ground of your computer via
the interconnecting cable provided. This is done in order to minimise interference. If
the PC (especially laptop) is not grounded, reading stability cannot be guaranteed and
it may be necessary to manually ground the equipment.
As with most oscilloscopes and data loggers, you should take care to avoid connecting
the inputs of the product to anything which may be at a hazardous voltage. If in
doubt, use a meter to check that there is no hazardous AC or DC voltage. Failure to
check may cause damage to the product and/or computer and could cause injury to
yourself or others.
Take great care when measuring temperatures near mains equipment. If a sensor is
accidentally connected to mains voltages, you risk damage to the converter or your
computer and your computer chassis may become live.
You should assume that the product does not have a protective safety earth. Incorrect
configuration or use of the device to measure voltages outside the maximum input
range can be hazardous.
Repairs
The unit contains no user-serviceable parts. Repair or calibration of the unit requires
specialised test equipment and must be performed by Pico Technology or its
authorised distributors.

Introduction 3
Copyright 2005-9 Pico Technology Ltd. All rights reserved. pt104.en
1.3 Legal information
The material contained in this release is licensed, not sold. Pico Technology grants a
licence to the person who installs this software, subject to the conditions listed below.
Access
The licensee agrees to allow access to this software only to persons who have been
informed of these conditions and agree to abide by them.
Usage
The software in this release is for use only with Pico products or with data collected
using Pico products.
Copyright
Pico Technology Limited claims the copyright of, and retains the rights to, all material
(software, documents etc.) contained in this release. You may copy and distribute the
entire release in its original state, but must not copy individual items within the
release other than for backup purposes.
Liability
Pico Technology and its agents shall not be liable for any loss, damage or injury,
howsoever caused, related to the use of Pico Technology equipment or software,
unless excluded by statute.
Fitness for purpose
No two applications are the same: Pico Technology cannot guarantee that its
equipment or software is suitable for a given application. It is your responsibility,
therefore, to ensure that the product is suitable for your application.
Mission-critical applications
This software is intended for use on a computer that may be running other software
products. For this reason, one of the conditions of the license is that it excludes usage
in mission-critical applications, for example life support systems.
Viruses
This software was continuously monitored for viruses during production. However,
you are responsible for virus-checking the software once it is installed.
Support
If you are dissatisfied with the performance of this software, please contact our
technical support staff, who will try to fix the problem within a reasonable time scale.
If you are still dissatisfied, please return the product and software to your supplier
within 14 days of purchase for a full refund.
Upgrades
We provide upgrades, free of charge, from our web site at www.picotech.com. We
reserve the right to charge for updates or replacements sent out on physical media.
Trademarks
Pico Technology Limited, PicoScope, PicoLog, DrDAQ and EnviroMon are trademarks of
Pico Technology, registered in the United Kingdom and other countries.
Pico Technology acknowledges the following product names as trademarks of their
respective owners: Windows, Excel, Visual Basic, LabVIEW, Agilent VEE, Delphi.

PT-104 User's Guide4
Copyright 2005-9 Pico Technology Ltd. All rights reserved.pt104.en
2 Product information
2.1 Specifications
Temperature
Resistance
Voltage
Sensor
PT100*, PT1000
N/A
N/A
Range
-200 to 800°C
0 to 375 W*;
0 to 10 kW
0 to 115 mV;
0 to 2.5 V*
Linearity
10 ppm
10 ppm
10 ppm
Accuracy @25°C
0.01°C*
20 ppm*
0.2%*
Temperature
coefficient
3 ppm/°C
3 ppm/°C
100 ppm/°C
RMS Noise
(using filter)
0.01°C
10 ppm
10 ppm
Resolution
0.001°C
1 mW
0.156 mV
Conversion Time
Per Channel
720 ms**
720 ms**
180 ms
Number of inputs
4
Connectors
4-pin mini-DIN
Input impedance
>> 1 MW
Overvoltage
protection
±30 V
Output
RS-232, DE9 female
Environmental
20 to 30°C for stated accuracy; 0 to 70°C overall; 20 to 90% RH
Dimensions
W 135 mm x L 184 mm x H 36 mm
(5.31" x 7.24" x 1.42")
Software
PicoLog data logging software; Drivers for Windows XP SP2/
Vista; Examples for C/C++, Delphi, Excel, LabVIEW, Visual Basic,
Agilent-VEE.
Quoted accuracy is for options marked *
For four-wire temperature and resistance measurement**
2.2 Installing the driver
The driver is installed automatically when you install the PicoLog software.
Alternatively, you can download the driver from our website at http://www.picotech.
com.

Product information 5
Copyright 2005-9 Pico Technology Ltd. All rights reserved. pt104.en
2.3 Connection
To use the PT-104, you should connect its D-connector to your computer's serial port
using the cable provided. Next, connect a PT100 or PT1000 PRT to one of the input
connectors.
Pin Connections to the PT-104 Mini-DIN socket
Pin
PT100, PT1000
4 Wire
PT100, PT1000
3 Wire
PT100, PT1000
2 Wire
Differential voltage
1
White
Connect to pin 3
Connect to pin 3
Do not connect
2
Red
Red
Red
V -
3
White
White
White
V +
4
Red
Red
Connect to pin 2
Gnd
Single-ended voltage connection
Single-ended mode allows you to double the number of channels from 4 to 8. It is
supported by the driver, so you can use it in your own applications. It is not,
however, supported by PicoLog.
Connector
Channel
Pin
1
1
3
5
2
2
2
3
6
2
3
3
3
7
2
4
4
3
8
2
Note on Differential Voltage Mode
The maximum input voltage range of the PT-104 is 2.5 V. Any voltage in excess
of +/-30 V on any input pin may cause permanent damage to the unit.
In Differential Voltage Mode, the input connector should be treated as a differential
input with reference to ground. Both inputs (V+ and V-) must be zero volts or above
(it does not matter which input has the higher voltage) and must remain within the
input range. A ground reference connection is also required for correct operation. The
ground connection of each mini-DIN socket consists of a 100 Wresistor to mains
earth/ground via the serial cable outer braiding and the PC chassis.

PT-104 User's Guide6
Copyright 2005-9 Pico Technology Ltd. All rights reserved.pt104.en
Setting up
To set up the unit, do the following:
1. From the PicoLog Recorder File menu, select New settings. The Recording
dialog box appears:
2. Click OK. The Sampling Rate dialog box appears:
3. Click OK. The Converter details dialog box appears:
4. From the Converter type drop-down list, select PT-104.

Product information 7
Copyright 2005-9 Pico Technology Ltd. All rights reserved. pt104.en
5. From the Port drop-down list, select the port and click OK. After a short while,
the PT-104 channels window appears:
6. In the PT-104 channels window, double-click on Ch1 unused. The Edit PT-
104 Channel dialog box appears:
7. Type in a name for the channel, if required
8. Select the data type required i.e temperature, resistance or voltage
9. Select circuit - for PT100 and PT1000
10. Now click OK. Readings from the PT-104 should appear in the monitor window:

PT-104 User's Guide8
Copyright 2005-9 Pico Technology Ltd. All rights reserved.pt104.en
2.4 Background on PRTs
PRTs (Platinum Resistance Thermometers) offer excellent accuracy over a wide
temperature range (from -200 to 850°C). Sensors are interchangeable between
different manufacturers, and are available in various accuracy ratings in packages to
suit most applications. Unlike thermocouples, it is not necessary to use special cables
to connect to the sensor.
The principle of operation is to measure the resistance of a platinum element. The
most common type (PT100) has a resistance of 100 Wat 0°C and 138.4 Wat 100°C.
The relationship between temperature and resistance is approximately linear over a
small temperature range: for example, if you assume that it is linear over the 0 to
100°C range, the error at 50°C is 0.4°C. For precision measurement, it is necessary
to linearise the resistance to give an accurate temperature. The most recent definition
of the relationship between resistance and temperature is International Temperature
Standard 90 (ITS-90). This linearisation is done automatically with software.
The linearisation equation is:
Rt = R0 * (1 + A* t + B*t2 +C*(t-100)* t3)
A = 3.9083 E-3
B = -5.775 E-7
C = (below 0°C) -4.183 E -12
(Above 0°C) zero
For a PT100 sensor, a 1°C temperature change will cause a 0.384 Wchange in
resistance, so even a small error in measurement of the resistance (for example, the
resistance of the wires leading to the sensor) can cause a large error in the
measurement of the temperature. For precision work, sensors have four wires - two
to carry the sense current, and two to measure the voltage across the sensor
element. It is also possible to obtain three-wire sensors, although these operate on
the (not necessarily valid) assumption that the resistance of each of the three wires is
the same.
The current through the sensor will cause some heating. For example, a sense
current of 245 µA through a 100 Wresistor will generate 6 µW of heat. If the sensor
element is unable to dissipate this heat, it will report an artificially high temperature.
This effect can be reduced by either using a large sensor element, or by making sure
that it is in good thermal contact with its environment.
Using a 1 mA sense current will give a signal of only 100 mV. Because the change in
resistance for a degree Celsius is very small, even a small error in the measurement
of the voltage across the sensor will produce a large error in the temperature
measurement. For example, a 100 µV voltage measurement error will give a 0.4°C
error in the temperature reading. Similarly, a 1 µA error in the sense current will give
0.4°C temperature error.
Because of the low signal levels, it is important to keep any cables away from electric
cables, motors, switchgear and other devices that may emit electrical noise. Using
screened cable, with the screen grounded at one end, may help to reduce
interference. When using long cables, it is necessary to check that the measuring
equipment is capable of handling the resistance of the cables. Most equipment can
cope with up to 100 Wper core.

Product information 9
Copyright 2005-9 Pico Technology Ltd. All rights reserved. pt104.en
The type of probe and cable should be chosen carefully to suit the application. The
main issues are the temperature range and exposure to fluids (corrosive or
conductive) or metals. Clearly, normal solder junctions on cables should not be used
at temperatures above about 170°C.
Sensor manufacturers offer a wide range of sensors that comply with BS1904 class B
(DIN 43760). These sensors offer an accuracy of ±0.3°C at 0°C. For increased
accuracy, you can use BS1904 class A (±0.15°C) or tenth-DIN sensors (±0.03°C).
Companies like Isotech can provide standards with 0.001°C accuracy. Please note
that these accuracy specifications relate to the SENSOR ONLY. It is necessary to add
on any error in the measuring system as well.
Related standards are IEC751 and JISC1604-1989. IEC751 also defines the colour
coding for PRT sensor cables: the one or two wires atttached to one end of the sensor
are red, and the one or two wires at the other end are white.

PT-104 User's Guide10
Copyright 2005-9 Pico Technology Ltd. All rights reserved.pt104.en
3 Driver information
3.1 Introduction
The PT-104 is supplied with driver routines that you can build into your own
programs.
Once you have installed the software, the Drivers directory contains the drivers and
a selection of examples of how to use the drivers. It also contains a copy of this
manual as a PDF file.
The driver routine is supplied as a Windows DLL.
The Windows DLL can be used with C, C++, Delphi and Visual Basic programs: it can
also be used with programs like Microsoft Excel, where the macro language is a form
of Visual Basic. More than one application can access the Windows DLL at the same
time, as long as the applications do not change the settings for channels that they are
not using.
These are the routines in the driver:
pt104_open_unit
Open the device on a specified serial port.
pt104_close_unit
Close the port (do this each time you finish using the
device!)
pt104_poll_driver
Poll the driver (not usually necessary).
pt104_get_cycle
Find out when the driver has taken a new set of
readings.
pt104_set_channel
Specify the sensor type and filtering for a channel.
pt104_set_mains
Specify the mains setting 50 or 60 Hz. This enables the
product to reject mains-frequency interference signals.
pt104_get_value
Get the most recent data reading from a channel.
pt104_get_version
Get the version number of this PT-104.
pt104_get_unit_info
Get the version number, batch number and calibration
number and date of this PT-104.
pt104_get_driver_version
Get the version number of the driver.
pt104_labview
Easy to use interface for LabVIEW.
The normal calling sequence for these routines is as follows:
1. Open driver
2. Set Channels
3. While you want to read data
4. Get data
5. End While
6. Close Unit
7. Close Driver

Driver information 11
Copyright 2005-9 Pico Technology Ltd. All rights reserved. pt104.en
3.2 pt104_open_unit
short pt104_open_unit ( short port );
This routine specifies the serial port number with a PT-104 unit. If you wish to use
more than one PT-104, you should call the routine once for each PT-104.
Arguments:
port - the port must be 1 for COM1, 2 for COM2, and so on
Returns:
TRUE - if the driver successfully opens the PT-104
3.3 pt104_close_unit
void pt104_close_unit (
unsigned short port);
This routine disconnects the driver from the specified serial port.
If you successfully open any serial ports, you MUST call pt104_close_unit for each
port before you exit from your program. If you do not, your computer may misbehave
until you next reboot it.
Arguments:
port - the port number. The port must be 1 for COM1, 2 for COM2,
and so on
Returns:
none
3.4 pt104_poll_driver
void pt104_poll_driver (void);
It is not normally necessary to call this routine, as the driver uses the timer to poll the
PT-104. Some programs, like Excel, appear to block the timer, so it is necessary to
poll the driver periodically whilst waiting for data.
Arguments:
none
Returns:
none

PT-104 User's Guide12
Copyright 2005-9 Pico Technology Ltd. All rights reserved.pt104.en
3.5 pt104_get_cycle
unsigned short pt104_get_cycle(
unsigned long far * cycle,
unsigned short port);
This routine returns the number of complete cycles of readings taken from a specified
PT-104.
When you call pt104_get_value, it returns immediately with the most recent reading
for the specified channel. If you call it repeatedly, it will return the same reading
repeatedly, until the driver takes the next reading from that channel.
If you wish to record values only when the driver has taken a new reading, you can
use this routine to find out how many complete cycles of readings the driver has
taken, then you can call pt104_get_value only when a cycle has completed.
Note: Each PT-104 is polled independently, so the cycle numbers for multiple PT-104s
may not keep in step.
Arguments:
cycle - a pointer to an array where the cycle numbers are stored
port - the port number. The port must be 1 for COM1, 2 for COM2,
and so on
Returns:
a value representing the number of complete cycles of readings
taken from a particular PT-104
3.6 pt104_set_channel
short pt104_set_channel (
unsigned short port,
unsigned short channel,
unsigned short data_type
unsigned short no_of_wires);
You should call this routine once for each channel that you would like to take readings
from. You can do this any time after calling pt104_open_unit.
The fewer channels are selected, the more frequently these channels will be updated.
It takes about 1 second per active channel.
If a call to pt104_set_channel has a data_type of single ended, then the channel
specified's 'sister' channel is also enabled. For example, enabling 3 also enables 7.
Arguments:
channel - specifies which channel you want to set the details for.
It should be between 1 and 4 if using single ended inputs in voltage
mode.
data_type - set to the type of reading you require (1 for PT100, 2
for PT1000, 3 for resistance 0 to 500 R, 4 for resistance 0 to 10 k, 5
for differential voltage 0 to 100 mV, 6 for differential voltage 0 to
2.5 V, 7 for single ended voltage 0 to 100 mv and 8 for single-
ended voltage 0 to 2.5 V
no_of_wires - specifies how many wires the PT100 or PT1000 has
(set to 2, 3 or 4)
Returns:
TRUE - if the channel was successfully set

Driver information 13
Copyright 2005-9 Pico Technology Ltd. All rights reserved. pt104.en
3.7 pt104_set_mains
void pt104_set_mains (
unsigned short sixty_hertz);
This routine is used to select the mains frequency of 50 or 60 Hz.
Choosing the wrong frequency may increase susceptibility to electrical noise.
Arguments:
sixty_hertz - for 50 Hz set to 0; for 60 Hz set to 1
Returns:
none
3.8 pt104_get_value
short pt104_get_value (
long far * data,
unsigned short port,
unsigned short channel,
unsigned short filtered);
Once you open the driver and define some channels, the driver begins to take
continuous readings from the PT-104. When you call this routine, it immediately sets
data to the most recent reading for the specified channel.
Temperatures are returned in thousandths of a degree Celsius, voltages in the 2.5 V
range are returned in tens of nanovolts (2.5 V returned as 250 000 000 * 10 nV),
voltages in the 115 mV range are returned in nanovolts and resistances in milliohms.
When measuring single-ended voltages:
connector 1 pin 2 is channel 1
connector 2 pin 2 is channel 2
...
connector 1 pin 3 is channel 5
connector 2 pin 3 is channel 6
Arguments:
data - a pointer to an array where the sample values will be stored
port - the port number. The port must be 1 for COM1, 2 for COM2,
and so on
channel -
1 - returns a reading from Channel 1
2 - returns a reading from Channel 2
3 - returns a reading from Channel 3
4 - returns a reading from Channel 4
filtered - if set to TRUE, the driver returns a low-pass filtered value
of the temperature. The time constant of the filter depends on the
value of filter_factor for this channel, and on how many channels
are active
Returns:
TRUE - if a reading is available
FALSE - if any of the inputs are out of range. It will normally return
FALSE for a few seconds after you open the driver, until the driver has
taken a reading from the specified channel

PT-104 User's Guide14
Copyright 2005-9 Pico Technology Ltd. All rights reserved.pt104.en
3.9 pt104_get_version
unsigned short pt104_get_version (
unsigned short far * version,
unsigned short port);
This routine sets version to version number of the specified PT-104.
Arguments:
version - driver version. The upper byte of the version is always 104
for a PT-104; the lower byte is the two hex digits of the version and
release. It provides a useful check that the link to the PT-104 is
working correctly.
port - the port number. The port must be 1 for COM1, 2 for COM2,
and so on.
Returns:
TRUE - if the parameters are in range
3.10 pt104_get_unit_info
short pt104_get_unit_info (
char * str,
unsigned short line,
unsigned short port)
Call this routine to obtain information on the unit. str is set to the information
specified by line.
Arguments:
str - a pointer to a char array that is to receive the information
line - 0 for version number, 1 for calibration number, 2 for
calibration date, 3 for batch number
port - the port number. The port must be 1 for COM1, 2 for COM2,
and so on.
Returns:
the number of bytes written to str
3.11 pt104_get_driver_version
short pt104_get_driver_version (void)
Arguments:
none
Returns:
the version number of the current driver

Driver information 15
Copyright 2005-9 Pico Technology Ltd. All rights reserved. pt104.en
3.12 pt104_labview
short pt104_labview (
float * result,
unsigned short port,
unsigned short channel,
unsigned short data_type,
unsigned short filtered
unsigned short no_of_wires)
This is an easy-to-use interface for LabVIEW. To gain a thorough understanding of the
capabilities of this routine, see the example program supplied with the software.
Arguments:
result - a pointer to a float that is to receive the result
port - the port number. The port must be 1 for COM1, 2 for COM2,
and so on
channel - 1 for Channel 1, 2 for Channel 2, 3 for Channel 3, and so
on
data_type - set to the type of reading you require (1 for PT100, 2
for PT1000, 3 for resistance 0 to 500 R, 4 for resistance 0 to 10 k, 5
for differential voltage 0 to 100 mV, 6 for differential voltage 0 to
2.5 V, 7 for single ended voltage 0 to 100 mV and 8 for single ended
voltage 0 to 2.5 V
filtered - if set to TRUE, the driver returns a low-pass filtered
value of the temperature. The time constant of the filter depends on
the value of filter_factor for this channel, and on how many
channels are active
no_of_wires - specifies how many wires the PT100 or PT1000 has
(set to 2, 3or 4)
Returns:
1 - if successful
0 - if unsuccessful
3.13 Windows XP (SP2)/Vista
The 32-bit Windows driver is the file pt10432.DLL, which is installed in the
drivers\win32 directory. If an application is unable to find the DLL, try moving the
DLL to windows\system.
3.14 Linux
At time of release, Linux is not supported. Please check http://www.picotech.com/
drivers.html for updates.

PT-104 User's Guide16
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4Writing your own programs
4.1 C / C++
C
You should find the following files in the directory where your software is installed:
pt104tes.c - Demonstration file.
pt10432.dll - Windows 32-bit driver.
pt104.h - header file
Producing a library file (.lib)
For Borland and Watcom C, Microsoft Visual C version 1.5 or lower, use the implib
program that comes supplied with these compilers.
The command is:
Implib pt10432.lib pt10432.dll
This command is typed in at the command prompt - make sure you are in the correct
directory or the pt10432.dll file will not be found. This will create a file called
pt10432.lib.
The following steps are then required to use the drivers in your program:
1. Include the pt10432.lib in your program
2. Include the file pt104.h in the source file(s) of your program.
The pt104tes.c file can be used to demonstrate using the PT-104 driver program
within a Windows application. You will also need to include the resource file
pt104tes.rc.
For Microsoft Visual C versions 2, 4 and 5, Microsoft no longer supply implib.
Furthermore, the names used in these versions of C are decorated - there is a prefix
which indicates how many bytes are transferred to the routine as parameters. As a
result, the C names do not match the names in the DLL. The Microsoft tools to alias
decorated to undecorated names do not appear to work, so it is therefore necessary
to use ordinal linking- linking by number, rather than name. The file pt104ms.lib
(supplied with examples) contains all the neccessary routines. To use this file:
1. Include the pt104ms.lib in your project
2. Include the file pt104.h in the C source file(s) of your program.
C++
C++ programs can access all versions of the driver. If pt104.h is included in a C++
program, the PREF1 macro expands to extern "C": this disables name-decoration
and enables C++ routines to make calls to the driver routines using C headers.

Writing your own programs 17
Copyright 2005-9 Pico Technology Ltd. All rights reserved. pt104.en
4.2 Delphi
The win subdirectory contains a simple program pt104.dpr which opens the drivers
and reads temperatures from two channels. You will need the following files to build a
complete program:
pt104.dpr - Project file
pt104fm.dfm - Delphi form file
pt104fm.pas - Delphi Pascal unit
pt104.inc - Procedure prototypes for driver routines
The file pt104.inc contains procedure prototypes for the driver routines: you can
include this file in your application.
This example has been tested with Delphi version 2.
4.3 Excel
The easiest way to transfer data into Excel is to use PicoLog.
If, however, you need to do something that is not possible using PicoLog, you can
write an Excel macro which calls pt104xx.dll to read in a set of data values. The
Excel Macro language is similar to Visual Basic.
Excel 7
The example pt10432.XLS reads in 20 values from the unit on channel 1 at one per
second, and assigns them to cells A4 to A24.
4.4 LabVIEW
The routines described here were tested using LabVIEW under Windows 98 version
4.0.
Although it is possible to access all of the driver routines described earlier, it is easier
to use the special LabVIEW access routine. The pt104.llb library in the DRIVERS
subdirectory shows how to access this routine.
To use this routine, copy pt104.llb and pt10432.dll to your LabVIEW user.lib
directory.
You will then use the PT-104 sub-vi, and an example sub-vi which demonstrates how
to use them. You can use one of these sub-vis for each of the channels that you wish
to measure. The sub-vi accepts the port (1 for COM1), the channel (1 to 4) the PRT
type (1 for PT100, 2 for PT1000). The sub-vi returns a temperature for the PRT.

PT-104 User's Guide18
Copyright 2005-9 Pico Technology Ltd. All rights reserved.pt104.en
4.5 Visual Basic
The DRIVERS subdirectory contains the following files:
pt10432.VBP - Visual basic project file
pt10432.BAS - Contains procedure prototypes for driver routines
pt10432.FRM - Visual basic form
4.6 Agilent VEE
The routine described here was tested using Agilent-VEE version 5 under Windows 98.
The DRIVERS subdirectory contains the following files:
pt10432.dll - 32-bit driver file
pt104.vee - Agilent-VEE file
pt104.vh - Procedure prototypes for driver
To use the example, open the file pt104.vee in Agilent-VEE and edit the import
library icon so:
File Name path is set to the location of pt10432.dll
Definition File path is set to the location of pt104.vh
The example program collects 1000 readings from the PT-104 and displays them on
an XY trace.