Measurement WEB-TEMP User Manual
WEB-TEMP
Document Revision 5
March 2013
© Copyright 2013
User's Guide
Web-Enabled Sensor Measurement
HM WEB-TEMP.docx
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2
Table of Contents
Preface
About this User’s Guide ....................................................................................................................... 6
What you will learn from this user's guide ......................................................................................................... 6
Conventions in this user's guide ......................................................................................................................... 6
Where to find more information ......................................................................................................................... 6
Chapter 1
Introducing the WEB-TEMP ................................................................................................................. 7
Web interface ...................................................................................................................................................... 7
TCP/IP connection ............................................................................................................................................................ 7
Browser requirement ......................................................................................................................................................... 7
WEB-TEMP features .......................................................................................................................................... 7
Temperature channels ....................................................................................................................................................... 7
Alarms .............................................................................................................................................................................. 8
Digital I/O channels .......................................................................................................................................................... 8
WEB-TEMP block diagram ............................................................................................................................... 8
Chapter 2
Installing the WEB-TEMP ..................................................................................................................... 9
What comes with your shipment? ....................................................................................................................... 9
Hardware .......................................................................................................................................................................... 9
Documentation .................................................................................................................................................................. 9
Unpacking........................................................................................................................................................... 9
Installing the software ........................................................................................................................................ 9
Connecting the AC power adapter ...................................................................................................................... 9
Connecting the WEB-TEMP ............................................................................................................................ 10
Connecting to a LAN for communication within a network ............................................................................................10
Connecting to a LAN for communication across networks .............................................................................................10
Connecting the WEB-TEMP directly to a computer ........................................................................................................11
Using the web interface .................................................................................................................................... 12
Logging in to a device......................................................................................................................................................13
Configuring the WEB-TEMP using InstaCal ................................................................................................... 13
Setting network parameters ..............................................................................................................................................13
Calibrating the Hardware .................................................................................................................................. 14
Warm-up period ................................................................................................................................................ 14
Chapter 3
Signal Connections ............................................................................................................................. 15
Screw terminal pinout ....................................................................................................................................... 15
Sensor inputs ....................................................................................................................................................................15
Current excitation outputs ................................................................................................................................................16
Four-wire, two sensor common .......................................................................................................................................16
Four-wire, two sensor common .......................................................................................................................................16
CJC sensors ......................................................................................................................................................................16
Digital I/O ........................................................................................................................................................................16
Pull-up/down configuration .............................................................................................................................................16
Analog and digital ground ...............................................................................................................................................16
Power output ....................................................................................................................................................................16
Thermocouple connections ............................................................................................................................... 17
Wiring configuration ........................................................................................................................................................17
RTD and thermistor connections ...................................................................................................................... 17
Two-wire configuration ...................................................................................................................................................18
Three-wire configuration .................................................................................................................................................19
Four-wire configuration ...................................................................................................................................................19
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WEB-TEMP User's Guide
Semiconductor sensor measurements ............................................................................................................... 20
Wiring configuration ........................................................................................................................................................20
Digital I/O connections ..................................................................................................................................... 21
Configuring the DIO channels to generate alarms ...........................................................................................................21
Chapter 4
Functional Details ............................................................................................................................... 22
Thermocouple measurements ........................................................................................................................... 22
Cold junction compensation (CJC) ..................................................................................................................................22
Data linearization .............................................................................................................................................................22
Open-thermocouple detection (OTD) ..............................................................................................................................22
RTD and thermistor measurements .................................................................................................................. 22
Data linearization .............................................................................................................................................................23
External components ........................................................................................................................................ 23
Screw terminals................................................................................................................................................................23
Ethernet port ....................................................................................................................................................................23
External power connector ................................................................................................................................................23
POWER/COMM LED .....................................................................................................................................................24
LINK/ACTIVITY LED ...................................................................................................................................................24
Digital logic voltage switch .............................................................................................................................................24
Factory default reset button..............................................................................................................................................24
Chapter 5
Ethernet Troubleshooting .................................................................................................................. 25
Check the WEB-TEMP status LEDs ................................................................ ................................................ 25
Check the network settings on the computer .................................................................................................... 26
Check whether DHCP is enabled on the network server ..................................................................................................26
Verify that the computer is connected to the network ...................................................................................... 26
Verify the network path to the WEB-TEMP .................................................................................................... 27
Verify the network path to a remote WEB-TEMP ........................................................................................... 28
Check cached information ................................................................................................................................ 28
Deleting a NetBIOS table entry .......................................................................................................................................28
Deleting an ARP table .....................................................................................................................................................28
Getting help ...................................................................................................................................................... 28
Chapter 6
Specifications ...................................................................................................................................... 29
Analog input ................................................................................................ ..................................................... 29
Channel configurations ..................................................................................................................................... 30
Compatible sensors ........................................................................................................................................... 30
Accuracy ........................................................................................................................................................... 31
Thermocouple measurement accuracy .............................................................................................................................31
Semiconductor sensor measurement accuracy .................................................................................................................31
RTD measurement accuracy ............................................................................................................................................32
Thermistor measurement accuracy ..................................................................................................................................32
Throughput rate ................................................................................................................................................ 33
Digital input/output........................................................................................................................................... 34
Temperature alarms .......................................................................................................................................... 34
Memory ............................................................................................................................................................ 34
Microcontroller ................................ ................................................................................................................. 35
Power ................................................................................................................................................................ 35
Network ............................................................................................................................................................ 35
Ethernet compliance ........................................................................................................................................................35
Ethernet connection .........................................................................................................................................................35
Network factory default settings ......................................................................................................................................36
Network protocols ............................................................................................................................................................36
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WEB-TEMP User's Guide
Network security ..............................................................................................................................................................36
LED displays and the factory reset button ........................................................................................................ 37
Current excitation outputs (Ix+) ....................................................................................................................... 37
Environmental .................................................................................................................................................. 37
Mechanical ....................................................................................................................................................... 37
Screw terminal connector ................................................................................................................................. 38
Declaration of Conformity .................................................................................................................. 39
5
About this User’s Guide
What you will learn from this user's guide
This user's guide describes the Measurement Computing WEB-TEMP data acquisition device and lists device
specifications.
Conventions in this user's guide
For more information
Text presented in a box signifies additional information related to the subject matter.
Caution! Shaded caution statements present information to help you avoid injuring yourself and others,
damaging your hardware, or losing your data.
bold text Bold text is used for the names of objects on a screen, such as buttons, text boxes, and check boxes.
italic text Italic text is used for the names of manuals and help topic titles, and to emphasize a word or phrase.
Where to find more information
Preface
Additional information about WEB-TEMP hardware is available on our website at www.mccdaq.com. You can
also contact Measurement Computing Corporation with specific questions.
Knowledgebase: kb.mccdaq.com
Phone: 508-946-5100 and follow the instructions for reaching Tech Support
Fax: 508-946-9500 to the attention of Tech Support
Email: techsupport@mccdaq.com
6
Chapter 1
Introducing the WEB-TEMP
The WEB-TEMP is a temperature measurement device with a built-in web server. You can connect the device
to an Ethernet port or hub, start up your browser, and view current data.
The WEB-TEMP is fully supported by the Universal Library and TracerDAQ. These software programs are
included on the Measurement Computing Data Acquisition Software CD.
Web interface
The WEB-TEMP embedded web interface provides access to current data and configuration settings using a
standard web browser.
Browse to the device home page by entering the URL that is printed on the device into the browser. View
current sensor measurements, channel data, and configure hardware options from the device's web pages. Only
one user can change configuration options on the device at a time.
The web interface is built into the device's firmware, and does not need to be installed on a computer. No
external software is required other than a web browser and a TCP/IP connection.
TCP/IP connection
A TCP/IP connection is required to access the web interface. Connect the device's 10Base-T Ethernet port to a
local or wide area network using the supplied Ethernet cable, to a single computer through a hub using the
supplied Ethernet cable, or directly to a computer using a standard CAT-5 crossover cable.
Browser requirement
The web browser used to access the WEB-TEMP web interface must support JavaScript. The web interface was
tested with the following browsers for compatibility:
Mozilla Firefox™ 2.x
Microsoft Internet Explorer® 6.x
Microsoft Internet Explorer® 7.x
WEB-TEMP features
The WEB-TEMP provides eight temperature channels and eight digital I/O channels. An external supply
shipped with the device provides power. On-board LEDs display the status of communication and external
power.
All hardware configurable options are selectable with the web browser or InstaCal. Network configurable
options are settable with InstaCal. When using InstaCal, if the login settings have been changed from the
default, a login name and password are required to change configuration settings.
Temperature channels
The WEB-TEMP provides eight differential input channels that accept temperature sensor type inputs. A 24-bit
analog-to-digital (A/D) converter is provided for each pair of analog inputs. Each pair of inputs constitutes a
channel pair. Measurements are available from four sensor categories:
Thermocouple – types J, K, R, S, T, N, E, and B
Resistance temperature detectors (RTDs) – 2, 3, or 4-wire measurements of 100 Ω platinum RTDs
Thermistors – 2, 3, or 4-wire measurements
Semiconductor temperature sensors – LM35, TMP35 or equivalent
The sensor category is software programmable for each channel pair. Each channel pair can connect to a
different category of sensor. The sensor category between the channels that constitute a channel pair cannot be
mixed. However, thermocouple types within a channel pair can be mixed.
7
WEB-TEMP User's Guide Introducing the WEB-TEMP
The WEB-TEMP provides four integrated cold junction compensation (CJC) sensors for thermocouple
measurements, and built-in current excitation sources for resistive sensor measurements. Each CJC sensor is
dedicated to one of the four channel pairs. An open thermocouple detection feature lets you detect a broken
thermocouple. An on-board microprocessor automatically linearizes the measurement data according to the
sensor category.
Alarms
The WEB-TEMP features eight independent temperature alarms. Each alarm controls an associated digital I/O
channel as an alarm output. The input to each alarm is one of the temperature input channels. The output of each
alarm is software configurable as active high or low. The user-configurable threshold conditions activate each
alarm. When an alarm is activated, the associated DIO channel is driven to the active output state selected.
Digital I/O channels
Eight digital I/O channels are provided to communicate with external devices and to generate alarms. The
digital bits are software programmable for input or output. The digital output voltage is switch-selectable for
3.3 V or 5 V logic. A screw terminal is provided for pull-up or pull-down configuration.
The digital I/O channels power up in input mode unless the bit is configured for an alarm. When a digital bit is
configured as an alarm, that bit is configured as an output and assumes the state defined by the alarm
configuration.
If you need to log data or display data graphically
The WEB-TEMP displays current data read from the device, and does not log or store historical data. For
logging or trending needs, use the TracerDAQ software included on the Measurement Computing Data
Acquisition Software CD.
WEB-TEMP block diagram
WEB-TEMP functions are illustrated in the block diagram shown here.
Figure 1. Functional block diagram
8
Installing the WEB-TEMP
What comes with your shipment?
The following items are shipped with the WEB-TEMP.
Hardware
WEB-TEMP
Ethernet cable (standard)
You can optionally purchase a crossover cable (CAT-5 or higher) to connect the WEB-TEMP to an
Ethernet card installed in a computer.
External power supply and cord – 10 watt AC power adapter. MCC part number PS-5V2AEPS.
Software
MCC DAQ Software CD
Documentation
Quick Start Guide
This booklet provides an overview of the MCC DAQ software you received with the device, and includes
information about installing the software. Please read this booklet completely before installing any software
or hardware.
Setup Options
An overview of installation options is provided in the WEB-TEMP setup options that ships with the device.
Chapter 2
Unpacking
As with any electronic device, you should take care while handling to avoid damage from static
electricity. Before removing the WEB-TEMP from its packaging, ground yourself using a wrist strap or by
simply touching the computer chassis or other grounded object to eliminate any stored static charge.
If any components are missing or damaged, contact us immediately using one of the following methods:
Knowledgebase: kb.mccdaq.com
Phone: 508-946-5100 and follow the instructions for reaching Tech Support
Fax: 508-946-9500 to the attention of Tech Support
Email: techsupport@mccdaq.com
For international customers, contact your local distributor. Refer to the International Distributors section on our
website at www.mccdaq.com/International.
Installing the software
Refer to the Quick Start Guide for instructions on installing the software on the MCC DAQ CD. This booklet is
available in PDF at www.mccdaq.com/PDFmanuals/DAQ-Software-Quick-Start.pdf.
Connecting the AC power adapter
Power to the WEB-TEMP is provided with the 10 watt AC power adapter (PS-5V2AEPS). Connect the adapter
cord to the power connector on the WEB-TEMP device, and plug the AC adapter into an electrical outlet.
The POWER/COMM LED illuminates when +5 V power is supplied to the WEB-TEMP. If the voltage supply is
less than +4.75 V or more than +5.25 V, the POWER/COMM LED will not light.
Refer to Figure 11 on page 23 for the location of the POWER/COMM LED.
9
WEB-TEMP User's Guide Installing the WEB-TEMP
Connecting the WEB-TEMP
A TCP/IP connection between the WEB-TEMP and the network or computer is required to access the web
interface. A 10Base-T compatible Ethernet port, hub, or switch is required.
You can connect the WEB-TEMP using the following configurations:
Connect to your Local Area Network (LAN) for communication within a private network/intranet; refer to
the procedure below.
Connect to your LAN for communication across networks (communicate over the internet, for example);
refer to the procedure below.
Connect directly to a computer's Ethernet port for local access (requires a crossover cable (not provided) or
network hub); refer to the procedure on page 11.
Use the standard Ethernet cable provided to connect the WEB-TEMP to a TCP/IP-based local or wide area
network or to connect to a single PC through a hub or switch. Use a CAT-5 or higher crossover cable (not
provided) to connect the WEB-TEMP to an Ethernet card installed in a computer.
How you access the web interface once a TCP/IP connection is established depends on your configuration:
When the WEB-TEMP is connected to the same network as the computer browser, enter the URL that is
printed on the device to open the device's home page.
When the WEB-TEMP is connected to a different network as the computer browser, enter the public IP
address set for the device to open the device's home page. Refer to "Connecting to a LAN for
communication across networks" below for more information.
Connecting to a LAN for communication within a network
Use this procedure to connect the WEB-TEMP to a local area network (LAN). When connected, all computers
installed on the same network can access the WEB-TEMP web interface.
Note: This procedure assumes the network server is equipped with DHCP (dynamic host configuration
protocol), and will automatically assign an IP address to the WEB-TEMP when it is connected to the network.
1. Connect the WEB-TEMP to the network using the Ethernet cable provided.
The Link/Activity LED will illuminate steady green to indicate that you have established a valid Ethernet
connection.
2. Open your web browser, and enter the URL that is printed on the device label.
The WEB-TEMP Measurements page opens. You can view current measurement data from this page. A log in
name (default is "webtemp") and password (default is "mccdaq") are required to change configuration settings.
If the WEB-TEMP is not recognized by the network
If the WEB-TEMP Measurements page does not open, the server may not have DHCP, or DHCP may be
disabled on the server. In either situation, assign a static IP address to the WEB-TEMP before connecting to the
network. Refer to "Connecting the WEB-TEMP directly to a computer" on page 11 for instructions. After you
assign the static IP address, connect to the network using the standard Ethernet cable shipped with the device,
open the browser, and enter the static IP address.
Configuring the WEB-TEMP
All hardware options are configurable with InstaCal or the web interface. InstaCal must be used if any of the
network parameters need to be changed, such as the IP address of your device. Configuration settings are stored
in non-volatile memory in EEPROM, and are loaded on power up.
Refer to the sections "Using the web interface" on page 12 and "Configuring the WEB-TEMP using InstaCal "
on page 13 for detailed information.
Connecting to a LAN for communication across networks
In order to communicate with the WEB-TEMP from a computer connected to a different network, such as over
the internet, you must change the network configuration of the network router.
10
WEB-TEMP User's Guide Installing the WEB-TEMP
In the following procedure, the WEB-TEMP is installed at the "host" LAN, and the computer is installed at the
"client" LAN.
Caution! This procedure should only be performed by a network administrator or computer professional.
Incorrect settings can significantly disrupt a network.
1. Connect the WEB-TEMP to a LAN (host) that has access to the Internet using the cable provided.
The Link/Activity LED will illuminate steady green to indicate that you have established a valid Ethernet
connection.
2. Configure the WEB-TEMP at the host LAN to access the web page:
o Assign a fixed "private" static IP address to the WEB-TEMP.
o Configure the firewall/router to map a static "public" IP address to the "private" IP address assigned
above. Record this address for use in step 3.
o Configure the firewall/router to forward incoming traffic from the public IP address to the HTTP port
("port 80") of the private static IP address.
Note: If your network has an HTTP server already running, network address translation (NAT) allows
different ports to redirect to the WEB-TEMP on port 80. Contact your network administrator or
computer professional for more information.
Note: To access the WEB-TEMP using InstaCal and the Universal Library, configure the firewall to
allow incoming traffic to the UDP port ("port 54211" by default).
3. At the client LAN, open your web browser, and enter the "public" IP address recorded in step 2 above.
Note: To access the WEB-TEMP by name, a DNS entry must be assigned.
The WEB-TEMP Measurements page opens. You can view current measurement data from this page. A log in
name and password are required to change configuration settings.
Accessing the WEB-TEMP using InstaCal and the Universal Library
InstaCal cannot automatically detect a WEB-TEMP that is installed on a different subnet. To change
configuration settings with InstaCal or communicate with a WEB-TEMP using programs written with the
Universal Library, manually add the public IP address to InstaCal. InstaCal can then search the public address
provided for the WEB-TEMP. We recommend that the port number be set to 54211 for use with InstaCal and
the Universal Library. Port 80 is used for the web interface. For information on port configuration, contact your
network administrator or computer professional.
Configuring the WEB-TEMP
All hardware options are configurable with InstaCal or the web interface. InstaCal must be used if any of the
network parameters need to be changed, such as the IP address of your device. Configuration settings are stored
in non-volatile memory in EEPROM, and are loaded on power up.
Refer to the sections "Using the web interface" on page 12 and "Configuring the WEB-TEMP using InstaCal "
on page 13 for detailed information.
Connecting the WEB-TEMP directly to a computer
Use this procedure to connect the WEB-TEMP directly to a computer. This scenario provides local access only,
and requires that you set up your computer to use a static IP address for communication with the WEB-TEMP.
If you are not using a network hub, a CAT-5 (or higher) crossover cable is required to connect to the computer's
Ethernet port. If you are connecting to your computer through a network hub or switch, the Ethernet cable
provided with your device can be used.
Knowledge of network configuration is required
If you are not familiar with network configurations and have questions regarding your network settings, consult
your network administrator or a computer professional.
1. Select Start » Control Panel > Network Connections.
2. Double-click on Local Area Connection.
11
WEB-TEMP User's Guide Installing the WEB-TEMP
3. Select Internet Protocol (TCP/IP) and click Properties.
4. Select Use the following IP address option and enter the following:
o IP address: Enter 192.168.0.102. Note that the last three digits of this number can be any number
between 11 and 254, inclusive, but must be different from the IP address assigned to the device. The
default IP address set for the WEB-TEMP is 192.168.0.101.
o Subnet mask: Enter 255.255.255.0.
o Default gateway: Enter 192.168.0.1.
Caution! Assigning an arbitrary IP address could result in duplicate IP addresses on the network. This
condition can cause a communication failure that affects both devices. Make sure when
configuring static IP addresses that you set different addresses for each device.
5. Click OK.
6. Connect the WEB-TEMP Ethernet port to your Ethernet hub using the supplied cable, or to your computer's
Ethernet port using a CAT-5 or higher crossover cable.
Note: If you connect to an Ethernet hub, you can use the Ethernet cable shipped with the device. If you
have multiple WEB-TEMP devices, configure each device separately and assign a unique IP address to
each device. You’ll need to run InstaCal to change the IP address from the default 192.168.0.101.
When connected, the Link/Activity LED illuminates steady green to indicate that you have established a
valid Ethernet connection, and blinks indicating network traffic. Refer to Figure 11 on page 23 for the
location of the Link/Activity LED.
7. Open your browser and enter the URL address that is printed on the device label.
The WEB-TEMP Measurements page opens. You can view current measurement data from this page.
Configuring the WEB-TEMP
All hardware options are configurable with InstaCal or the web interface. InstaCal must be used if any of the
network parameters need to be changed, such as the IP address of your device. Configuration settings are stored
in non-volatile memory in EEPROM, and are loaded on power up.
Refer to the sections "Using the web interface" below and "Configuring the WEB-TEMP using InstaCal " on
page 13 for detailed information.
Using the web interface
You can view current measurements and configure hardware options from the device's web interface. The web
interface provides four tabs. Each tab represents an HTML page that is stored on the device.
Measurements tab (home page) – lists the temperature measurements, digital values, and alarm status read
from each channel on the WEB-TEMP.
12
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