Meilhaus Electronic RedLab WebDAQ 316 Manuel utilisateur
About this User's Guide
This user's guide describes the Meilhaus Electronic RedLab WebDAQ 316 data acquision device, the WebDAQ
web interface, and lists device specificaons.
Where to find more informaon
Addional informaon about the WebDAQ Series of internet enabled data loggers is available on our website at
www.meilhaus.de/en. You can also contact Meilhaus Electronic with specific quesons.
WebDAQ web interface: Open the Help window for informaon about using WebDAQ soware.
Email: [email protected]
Phone: +49 8141 5271-0 and follow the instrucons for reaching Tech Support
Hazardous voltages
Take the following precauons if you connect hazardous voltages to the RedLab WebDAQ 316 spring terminals.
A hazardous voltage is a voltage greater than 42.4 Vpk or 60 VDC to earth ground.
Ensure that hazardous voltage wiring is performed only by qualified personnel adhering to local electrical
standards.
Do not mix hazardous voltage circuits and human-accessible circuits on the same device.
Make sure that devices and circuits connected to the RedLab WebDAQ 316 are properly insulated from
human contact.
When device terminals are hazardous voltage LIVE (>42.4Vpk/60 VDC), you must install the high voltage screw
terminal backshell (ACC-401) to ensure that the terminals are not accessible and that the devices and circuits
connected to the RedLab WebDAQ 316 are properly insulated from human contact.
Hazardous locaons : The RedLab WebDAQ 316 is not cerfied for use in hazardous locaons.
Contents
RedLab WebDAQ 316 User's Guide
page 2
Introducing the RedLab WebDAQ 316
The RedLab WebDAQ 316 is part of the WebDAQ Series of Internet enabled data loggers. RedLab WebDAQ 316
is a thermocouple acquision and logging device that provides the following features:
16 differenal thermocouple inputs
75 S/s sample rate (all channels)
250 Vrms channel-to-earth isolaon
Overvoltage protecon between any two inputs
50/60 Hz noise rejecon
Cold juncon compensaon (CJC)
Auto zero channel
Four bidireconal, isolated DIO that are individually configurable for input (trigger) or output (alarm)
10/100 Ethernet interface
Support for USB WiFi adapters for wireless connecvity
Support for USB mass storage devices and SD cards for data logging or file transfer
Powered by an external power supply (included)
WebDAQ Series devices are designed with an integrated operang system and web interface. You communicate
with the device over a network connecon using the web interface opened in a web browser.
Mobile support – access the WebDAQ from any device with a web browser, such as a phone or tablet
Remote monitoring and control
Run simple to complex logging operaons
Flexible task scheduling
Powered by Raspberry Pi
The WebDAQ is designed with the Raspberry Pi Compute Module, featuring a quad core processor with speeds
up to 1.2 GHz, 1GB RAM and 4 GB Flash memory.
Integrated operang system and web service
The WebDAQ is a complete data acquision system containing an embedded operang system and web server.
The operang system resides in internal flash memory, and includes a web service and device driver. All
configuraon, acquision, and data management is performed using the web interface.
Ethernet interface
The WebDAQ has a built-in 10/100 BASE-T auto-negoaon, high-speed communicaon port. You can access
and configure your WebDAQ from anywhere with access to the network to which it is connected. A unique
MAC address is assigned to each device at the factory. You configure the Ethernet connecon sengs through a
web interface. The default network name uses the format webdaq-xxxxxx, where xxxxxx are the lower six digits
of the factory-assigned MAC address. You can change this name with the web interface.
RedLab WebDAQ 316 User's Guide
page 3
Open-source soware
WebDAQ firmware uses open-source soware components. Refer to Licenses for the licensing informaon of
each component. Open-source code is available upon request from [email protected].
Funconal block diagram
Device funcons are illustrated in the block diagram shown here.
Figure 1. Funconal block diagram
Unpacking
As with any electronic device, you should take care while handling to avoid damage from stac
electricity. Before removing the board from its packaging, ground yourself using a wrist strap or by simply
touching the computer chassis or other grounded object to eliminate any stored stac charge.
Contents
RedLab WebDAQ 316 User's Guide
page 4
Seng up the WebDAQ
Connecng to a local area network
The WebDAQ requires a TCP/IP connecon to a network or the Ethernet port of a computer. A standard
Ethernet cable is shipped with the device. The WebDAQ IP address type is set by default for DHCP/Link-Local.
When connected to a network, the device first aempts to receive an IP address from a DHCP server. If this
fails, a link-local address is used. Use of a stac address requires configuraon via the web interface. The IP
address idenfies the WebDAQ on the network, and is used to access the web interface.
Connecng to a network with DHCP enabled
Connect one end of the Ethernet cable to the connector on the WebDAQ rear panel, and connect the other end
to a 10Base-T or 100Base-TX compable Ethernet port, hub, or switch.
Once the device is detected, DHCP assigns an address. A different address may be assigned each me the
hardware is connected to the network.
WiFi support
Aer successfully configuring a wired connecon, you can use the web interface to configure the
WebDAQ for wireless communicaon. Refer to the Configuring the WebDAQ for wireless
communicaon secon for more informaon.
Connecng directly to a PC
Connect one end of the Ethernet cable to the connector on the WebDAQ rear panel, and connect the other end
directly to the Ethernet port on a PC. The WebDAQ aempts to communicate with the host PC using
169.254.100.100 – the link-local address stored on the device. The host PC may accept this address or use a
different address. The link-local address is valid only for communicaons between the WebDAQ and the host PC
to which it is connected.
Connecng the external power adapter
Connect the network cable before connecng to external power
Connecng to the external supply before installing on a network results in the device aempng to
auto-negoate a network address before one is available.
An external power adapter is included with each shipment (PS 9V1AEPS230V).
Connect the adapter to the power connector labeled EXT PWR on the device rear panel, and plug the AC
adapter into an electrical outlet.
Press the POWER buon. The POWER LED on the rear panel turns yellow as the hardware starts up, and green
when it is ready for use.
RedLab WebDAQ 316 User's Guide
page 5
Detecng the device on a network
WebDAQ uses the "zeroconf" zero-configuraon protocol to announce its presence on a local area network.
Zeroconf uses a device name which can be accessed from other computers on the network.
Zero-configuraon networking is helpful to find your WebDAQ hardware on the network
The easiest way to add zeroconf support to Windows is to install Bonjour Print Services. Bonjour
soware is Apple's implementaon of zero-configuraon networking, and is readily available as a free
download – open a browser window and search for Bonjour Print Services. Zeroconf is built into popular
applicaons such as Apple ITunes® and instant messaging soware, so your computer may already
support it. Many Linux systems will have the avahi version of zeroconf installed by default, so it's likely
zeroconf is available if you're running Linux.
Accessing the WebDAQ web interface
To access the WebDAQ web interface, open a browser window and enter hp://webdaq-xxxxxx.local, where
xxxxxx is the last 6 digits of the MAC address. The MAC address is on a label at the boom of the WebDAQ
enclosure.
If your network is configured for the zeroconf protocol, the WebDAQ web interface opens.
If the web interface does not open or an error is returned, install a device discovery tool such as Bonjour
Print Services. Refer to the note above about zero-configuraon networking.
The WebDAQ web interface is shown here.
Figure 2. WebDAQ web interface
Use the WebDAQ web interface to configure hardware and acquision opons, schedule and run jobs, and to
view and manage data. The Help window provides details about all components on the web interface.
Once a connecon is established and you can communicate to the device, you can change the configuraon for
other network scenarios.
* The latest version of Chrome, Firefox, Safari, UC Browser, or Opera recommended. Compable with IE v11
with the latest Windows Updates installed. Not recommended for use with other IE versions or the Edge
browser.
RedLab WebDAQ 316 User's Guide
page 6
Configuring the WebDAQ for wireless communicaon
Once communicaon is established on a wired network, you can connect a WiFi adapter to the USB port and
use the web interface to configure the WebDAQ for communicaon over a wireless network. With the WebDAQ
connected through the wired connecon, perform the following procedure.
1. Connect an approved WiFi adapter to the USB port on the WebDAQ rear panel.
2. Open the WebDAQ web interface in a browser window and go to the Device window, Network tab.
3. Select WiFi. Once the list of available networks updates, select the wireless network that you want to
connect to, and enter the password, if any.
If the connecon is successful, the selected wireless network will show above this list with a checkmark
next to it.
You can click on the selected network to open a WiFi Network Sengs dialog box where you can forget the
current network or configure the IP address type (DHCP/Link-Local or Stac).
4. Disconnect the Ethernet cable from the LAN connecon.
Wait a few seconds, and refresh the browser window.
Changing to a wireless network may require a reboot
If a connecon can't be established aer changing the network, you may need to reboot the operang
system and restart the WebDAQ using the Power buon.
Configuring the network router for communicaon across networks
To communicate with the WebDAQ over the internet from a computer connected to a different network, you
must change the network configuraon of the network router.
Cauon! This procedure should only be performed by a network administrator or computer
professional. Incorrect sengs can significantly disrupt a network.
In the following procedure, the WebDAQ is installed on the host LAN, the computer is installed on the client
LAN, and it is assumed that you have successfully connected the device to a local network.
1. Determine the IP address of the WebDAQ – open the Device window from the web interface, and note the
IP Address value on the Network Sengs tab.
2. Configure your router so that the address determined above is a stac address. The procedure for
accomplishing this varies between routers; refer to your router documentaon for instrucons.
3. Configure the firewall/router to forward an unused port to port 80 on the WebDAQ at the IP address
configured for the device.
Note the stac IP address assigned to the router – this is referred to as the WAN address.
4. To access your WebDAQ from a remote locaon, enter the WAN address followed by the port selected
above preceded by a colon in the web browser.
The format of the address entered in the browser is: 00.000.00.00:00000 (WAN address of router:port
selected for the WebDAQ).
RedLab WebDAQ 316 User's Guide
page 7
Security
Use the web interface to set the level of access to the website and to change the administrator password.
High: access to the web page requires a password.
Medium: access to the web page is permied for any user, and data can be read by any user, but changes
to the device configuraon or files require a password.
Off: full access is permied for all users; no password is required.
By default, security access is set to "Off", and the administrator password is set to "admin".
To change the security level or password, open the web interface and go to the Device window, Security tab.
Use the device Reset buon to restore security sengs to factory default values.
Restoring factory default sengs
To restore network configuraon and security sengs to the factory default values, use a paper clip to press
the CONFIG RESET buon. When pressed, the default network and security sengs are wrien to the device
and the WebDAQ is rebooted.
Factory default sengs
Parameter Specificaon
IP address 192.168.0.101
subnet mask 255.255.255.0
Gateway 192.168.0.1
DHCP seng DHCP + link-local enabled
Security level Off
Password for the admin
account
admin (case-sensive)
Password for the share
account
share (case-sensive)
Device name webdaq-xxxxxx, where xxxxxx is the last 6 digits of the MAC address
(printed on the label on the underside of the device).
The network sengs, security level, user account passwords and device name can be changed with the
WebDAQ web interface.
When factory defaults are restored, any shared folders or mapped drives are reset.
Contents
RedLab WebDAQ 316 User's Guide
page 8
Funconal Details
Front panel components
Figure 3. Front panel
1 Screw terminal 2 Spring terminal
Screw terminal
Connect up to four digital I/O lines (DIO0 to DI03) to the detachable screw terminal.
Figure 4. Screw terminal pinout
The digital ground (GND) terminals provide a common ground for the digital bits.
Digital connecons
The digital I/O lines are electrically isolated from the thermocouple circuits. Each bit is individually configurable
for input (trigger) or output (alarm), and features Schmi trigger inputs and open drain outputs. All DIO
channels are pulled high to 5 V.
Any digital bit can be configured with the web interface as a trigger to start or stop an acquision. Any digital
bit can also be configured to trigger an alarm, and be driven high or low when an alarm occurs.
Spring terminal
Connect up to 16 thermocouples (TC0+/TC0– to TC15+/TC15–) and two common reference connecons (COM)
to the 36-posion detachable spring terminal. Refer to Figure 5 for signal locaons.
Cauon! We strongly recommend that you ground yourself using a wrist strap before handling
thermocouple sensors.
RedLab WebDAQ 316 User's Guide
page 9
Figure 5. Spring terminal pinout
Thermocouple connecons
A thermocouple consists of two dissimilar metals that are joined together at one end. When the juncon of the
metals is heated or cooled, a voltage is produced that correlates to temperature.
The RedLab WebDAQ 316 supports type J, K, S, R, B, E, T, N thermocouples (TC), and provides overvoltage
protecon between any two inputs. A typical thermocouple connecon is shown in Figure 6.
Figure 6. Typical thermocouple connecon
Connect the shield to a common mode voltage reference on the thermocouple. A valid reference is voltage
within ±1.2 V of all the connected thermocouples.
Minimizing thermal gradients
Changes in the ambient air temperature near the thermocouple connectors or a thermocouple wire conducng
heat directly to terminal juncons can cause thermal gradients. Observe the following guidelines to minimize
thermal gradients and improve system accuracy:
Use small-gauge thermocouple wire. Smaller wire transfers less heat to or from the terminal juncon.
Run thermocouple wiring together near the spring terminal connector to maintain a consistent
temperature.
Avoid running thermocouple wires near hot or cold objects.
Minimize adjacent heat sources and air flow across the terminals.
Keep the ambient temperature as stable as possible.
RedLab WebDAQ 316 User's Guide
page 10
Table des matières
