Omega OM-NET-1608 User manual

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OM-NET-1608
8-Channel Multifunction
Ethernet Data Acquisition Module
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User’s Guide

The information contained in this document is believed to be correct, but OMEGA accepts no liability for any errors it contains, and reserves
the right to alter specifications without notice.
Servicing North America:
U.S.A.: Omega Engineering, Inc., One Omega Drive, P.O. Box 4047
Stamford, CT 06907-0047 USA
Toll-Free: 1-800-826-6342 (USA & Canada only)
Customer Service: 1-800-622-2378 (USA & Canada only)
Engineering Service: 1-800-872-9436 (USA & Canada only)
Tel: [phone] Fax: [phone]
e-mail: [email protected]
For Other Locations Visit omega.com/worldwide
omega.com [email protected]

3
Table of Contents
Preface
About this User's Guide .......................................................................................................................5
What you will learn from this user's guide .........................................................................................................5
Conventions in this user's guide .........................................................................................................................5
Where to find more information.........................................................................................................................5
Chapter 1
Introducing the OM-NET-1608..............................................................................................................6
Ethernet interface................................................................................................................................................6
Functional block diagram...................................................................................................................................7
Chapter 2
Installing the OM-NET-1608..................................................................................................................8
Unpacking...........................................................................................................................................................8
Installing the software ........................................................................................................................................8
Connecting the external power adapter ..............................................................................................................8
Connecting the OM-NET-1608..........................................................................................................................8
Configuring network settings .............................................................................................................................9
Address mode settings ...................................................................................................................................................... 9
IP address settings............................................................................................................................................................. 9
Setting up the OM-NET-1608 for communication across networks ..................................................................9
Configuring network alarms.............................................................................................................................10
Restoring factory default network settings .......................................................................................................10
Calibrating the hardware...................................................................................................................................10
Chapter 3
Functional Details ...............................................................................................................................11
Analog input modes..........................................................................................................................................11
Software paced.................................................................................................................................................................11
Hardware paced ...............................................................................................................................................................11
External components ........................................................................................................................................11
Screw terminals................................................................................................................................................................11
Ethernet connector...........................................................................................................................................................12
External power connector ................................................................................................................................................13
LEDs................................................................................................................................................................................13
Factory reset button .........................................................................................................................................................13
Signal connections............................................................................................................................................13
Analog input ....................................................................................................................................................................13
Analog output ..................................................................................................................................................................15
External clock I/O............................................................................................................................................................15
Digital I/O........................................................................................................................................................................15
Trigger input....................................................................................................................................................................16
Counter input...................................................................................................................................................................16
Power output....................................................................................................................................................................16
Ground.............................................................................................................................................................................16
Mechanical drawings........................................................................................................................................17
DIN-rail compatible.........................................................................................................................................................19
Chapter 4
Specifications......................................................................................................................................20
Analog input.....................................................................................................................................................20
Accuracy...........................................................................................................................................................21
Analog input DC voltage measurement accuracy ............................................................................................................21
Noise performance...........................................................................................................................................................21

OM-NET-1608 User's Guide
4
Settling time.....................................................................................................................................................................21
Analog output...................................................................................................................................................22
Analog input/output calibration........................................................................................................................23
Digital input/output...........................................................................................................................................23
External trigger.................................................................................................................................................24
External clock input/output...............................................................................................................................24
Counter.............................................................................................................................................................25
Memory ............................................................................................................................................................25
Power................................................................................................................................................................25
Network............................................................................................................................................................26
Ethernet connection .........................................................................................................................................................26
Network interface ............................................................................................................................................................26
Network factory default settings......................................................................................................................................26
Network security..............................................................................................................................................................26
LED displays and the factory reset button........................................................................................................27
Environmental ..................................................................................................................................................27
Mechanical .......................................................................................................................................................27
Screw terminal connector .................................................................................................................................27

5
Preface
About this User's Guide
What you will learn from this user's guide
This user's guide describes the Omega Engineering OM-NET-1608 data acquisition device and lists device
specifications.
Conventions in this user's guide
For more information about …
Text presented in a box signifies additional information and helpful hints related to the subject matter you are
reading.
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
Additional information about OM-NET-1608 hardware is available on our website at www.omega.com. You
can also contact Omega Engineering by phone, fax, or email with specific questions.
Phone: [phone]
Fax: [phone]
Email: [email protected]m

6
Chapter 1
Introducing the OM-NET-1608
The OM-NET-1608 is compatible with both TCP/IP (IPv4 only) and user datagram protocol (UDP) network
protocols.
The OM-NET-1608 provides the following features:
Four differential (DIFF) or eight single-ended (SE) analog input channels (16-bit)
Sample rates up to 250 kS/s aggregate
Two analog output channels (16-bit)
Eight individually-configurable digital I/O channels
One counter channel (32-bit) that counts TTL pulses
Screw terminals for field wiring connections
The OM-NET-1608 is powered by a 5 volt power adapter.
Ethernet interface
The OM-NET-1608 has one built-in 10/100 BASE-T auto-negotiation, high-speed communication port.
With the Ethernet interface, you can remotely access and configure your OM-NET-1608 from anywhere on the
network. Only one computer can control the OM-NET-1608 at one time. The networking protocols are TCP/IP
and UDP.
A unique media access control (MAC) address is assigned to each device at the factory.
You configure the Ethernet connection settings through software. A network name in the format E-1608-
xxxxxx, is assigned to the OM-NET-1608, where xxxxxx represents the lower six characters of the device
MAC address.

OM-NET-1608 User's Guide Introducing the OM-NET-1608
7
Functional block diagram
OM-NET-1608 functions are illustrated in the block diagram shown here.
Figure 1. Functional block diagram

8
Chapter 2
Installing the OM-NET-1608
Unpacking
As with any electronic device, you should take care while handling to avoid damage from static
electricity. Before removing the device 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.
Contact us immediately if any components are missing or damaged.
Installing the software
Refer to the Software User's Guide for instructions on installing the software on the CD. This booklet is
available in PDF at www.omega.com/manuals/manualpdf/M4803.pdf.
Connecting the external power adapter
Power to the OM-NET-1608 is provided with the 5 V external power adapter (OM-NET-PS). Connect the
adapter cord to the power connector on the OM-NET-1608 device, and plug the AC adapter into an electrical
outlet.
The Power LED turns on when 5 V power is supplied to the OM-NET-1608. If the voltage supply is less than
3.3 V or more than 5.9 V, the POWER LED does not turn on.
Refer to Figure 3 on page 12 for the location of the Power LED.
Connecting the OM-NET-1608
The OM-NET-1608 requires a TCP/IP and UDP connection to a network or computer. Use the standard
Ethernet cable provided to connect the OM-NET-1608 to a 10Base-T- or 100Base-TX compatible Ethernet port,
hub, or switch.
When connecting the OM-NET-1608 for the first time, make sure that you connect to a local network with
DHCP enabled.
If you are unsure whether you have access to a local network or that DHCP is enabled on that network, you
should use a direct connection to a Windows PC.
It may take a minute or two to detect the device and assign the address. The green Link/activity LED on the
lower left of the Ethernet connector turns on when there is a valid Ethernet link, and blinks when network
activity is detected.
Once the OM-NET-1608 is physically connected to the local network or PC, you can run software (InstaCal for
example) to establish a connection. If a connection cannot be established, make sure the device is using the
default configuration by following the instructions in the Restoring factory default network settings on page 10.
Once a connection is established and you can communicate to the device, you can change the configuration for
other network scenarios.

OM-NET-1608 User's Guide Installing the OM-NET-1608
9
Configuring network settings
The following OM-NET-1608 network settings are software-selectable. Only one user at a time can connect to
the OM-NET-1608 to configure network options on the device. For typical local networks, the default settings
are recommended.
Address mode settings
The address mode setting determines whether the default IP parameters (IPv4 address, subnet mask, and
gateway) are assigned to the OM-NET-1608 or an auto-addressing method is used to assign these parameters.
DHCP or link-local enabled (default)
If connected to a network with a DHCP server, the service automatically assigns IP addresses to the OM-NET-
1608.
If the connected network does not have a DHCP server, the address stored in the default IP address is assigned
to the OM-NET-1608.
If the OM-NET-1608 is directly connected to a Windows PC, a link-local address is assigned to the device. A
link-local address is valid only for communications between the OM-NET-1608 and the PC to which it is
connected
DHCP Only
Enables configuration by a DHCP server if one is available. The OM-NET-1608 is assigned an IP address
shortly after it is powered up and attached to the network.
Link Local Only
The OM-NET-1608 is assigned a link-local IP address by the Windows PC to which it is connected. A link-
local address is valid only for communications between the OM-NET-1608 and the PC to which it is connected.
Static
The default IPv4 Address is manually configured on the OM-NET-1608.
IP address settings
The default settings of the following IP address are assigned to the OM-NET-1608 when automatic addressing
is disabled or not available (DHCP or Link Local for example)
IPv4 address –The IP address that is stored on the device. The default IPv4 address is 192.168.0.101.
Subnet mask –The Subnet mask that is stored on the OM-NET-1608 . The subnet mask determines the
number of bits of the IP address that is used for the host portion of the address vs. the number of bits used
for the network portion. The default subnet mask is 255.255.255.000
Gateway –The gateway IP address that is stored on the OM-NET-1608. The gateway address of the device
that bridges subnets within a network. The default gateway is 192.168.0.1
Connection code
A number between 0 (default) and 999999999. Change this number from its default of 0 to prevent other users
from connecting to and configuring the device. The device remains visible to other users on the network, but
connection by another user is not allowed.
Setting up the OM-NET-1608 for communication across networks
In order to communicate with the OM-NET-1608 from a computer connected to a different network –such as
over the Internet –you must change the network configuration of the network router.
In the following procedure, the OM-NET-1608 is installed on the host LAN, and the computer is installed on
the client LAN.
Caution! This procedure should only be performed by a network administrator or computer professional.
Incorrect settings can significantly disrupt a network.

OM-NET-1608 User's Guide Installing the OM-NET-1608
10
1. Assuming you have successfully connected to a local network, determine the IP address of the device. If
the address was assigned by DHCP, it is recommended you change it to a static address by setting the
default address to the address assigned and setting the device network configuration to static.
2. Configure the firewall/router to forward incoming traffic to the following ports to the IP address assigned
to the device:
oUDP:54211 (discovery)
oTCP:54211 (commands)
oTCP:54212 (scan data)
3. On the computer connected to the client LAN, manually enter the WAN address of the host router, and
specify the ports that were forwarded to connect to the remote OM-NET-1608.
If the ports listed above are not available on your router, you can use the following guidelines to select different
ports: The first port must be configured for both UDP and TCP. The second port must be adjacent to the first
and configured for TCP. For example, you could use 54221 (TCP and UDP) and 54222 (TCP).
Configuring network alarms
You can use software to configure any digital output bit and/or each analog output channel to generate specific
values to indicate when the device is connected and/or disconnected.
The settings can also be used to initialize an output to a specific value when the device connects or disconnects
from the network.
Restoring factory default network settings
To reset the network configuration settings to the factory default values, complete the following steps (refer to
Device components on page 12 for the location of this button):
1. Remove power from the device.
2. Press and hold the Factory reset button while re-applying power.
3. Hold the button for at least four seconds until both the Power and Activity LEDs blink , indicating that the settings
have been restored to the factory defaults.
4. Release the button so the device continues startup with the default settings. If the button is released before the two
LEDs blink, the settings are not affected and the device starts up normally.
If InstaCal is open when default settings are restored, click the Refresh Boards button on the InstaCal toolbar
to reflect the changes.
Calibrating the hardware
Omega Engineering performs the initial factory calibration. Contact Omega Engineering for details about how
to return your device and have it calibrated to the factory specifications. The recommended calibration interval
is one year.
Field calibration is not supported.

11
Chapter 3
Functional Details
Analog input modes
The OM-NET-1608 can acquire analog input data in two basic modes –software paced and hardware paced.
Software paced
You can acquire one analog sample at a time in software-paced mode. You initiate the A/D conversion with a
software command. The analog value is converted to digital data and returned to the computer. Repeat this
procedure until you have the total number of samples that you want.
The sample rate in software paced mode is system-dependent and can range from 1000 S/s to 5000 S/s on local
networks (lower over the Internet or wireless networks).
Hardware paced
You can acquire data from up to eight channels in hardware-paced mode. The analog data is continuously
acquired, converted to digital values, and written into the FIFO buffer on the device until you stop the scan. The
FIFO buffer is serviced in blocks as the data is transferred from the FIFO buffer to the computer memory
buffer. You start a continuous scan with either a software command or with an external hardware trigger event.
The maximum sample rate in hardware paced-mode from one to eight channels is 250 kS/s aggregate on local
hardwired networks (may be lower over the Internet or local wireless networks).
External components
The OM-NET-1608 has the following external components:
Screw terminals
LED status indicators
Ethernet connector
External power connector
Factory reset button
Screw terminals
The OM-NET-1608 device screw terminals provide the following connections:
Eight SE or four DIFF (CH0H/CH0L to CH3H/CH3L) analog input connections
Eight digital I/O connections (DIO0 to DIO7)
Two analog output connections (AOUT0, AOUT1)
One external clock input (AICKI) and one external clock output (AICKO) for analog inputs
One digital trigger input (TRIG)
One counter input (CTR)
One power output (+VO)
Six analog ground (AGND) and three digital ground (GND) connections
The location of each signal is shown in Figure 2.

OM-NET-1608 User's Guide Functional Details
12
Figure 2. OM-NET-1608 pinout
The remaining components are on the top edge of the enclosure; refer to Figure 3:
1
External power connector
4
Activity LED (bottom)
2
Ethernet connector with green Link/activity LED
(left) and yellow Speed LED (right)
5
Factory reset button
3
Power LED (top)
Figure 3. OM-NET-1608 connectors, reset button, and status LEDs
Ethernet connector
The OM-NET-1608 has one 10/100 BASE-T, auto-negotiation, high-speed communication port. The port
connector is an RJ-45, eight-position connector. The Ethernet port accepts CAT-5 shielded or unshielded
twisted pair cable. The maximum communication distance without using a repeater is 100 meters. You can send
your data 100 meters at data speeds of up to 100 Mbps using only one Ethernet cable connected to your
computer.

OM-NET-1608 User's Guide Functional Details
13
External power connector
Connect the 5 V external power adapter (OM-NET-PS) to this connector to provide 5 V external power to the
OM-NET-1608.
LEDs
The Power LED is steady green when external power between 3.3 V to 5.9 V is supplied to the OM-NET-1608.
The Power LED turns off when:
power is not supplied by the external supply (make sure that the supply is fully connected to the power
connector)
the input power is outside of the specified voltage range of the external supply (3.3 V to 5.9 V ), causing a
power fault
The OM-NET-1608 has an onboard voltage supervisory circuit that monitors the 5 V external power supply.
The Activity LED is on when there is a valid host connection, and blinks when a command is received or an
analog input scan is running.
Ethernet connector LEDS
The green Link/activity LED on the lower left of the Ethernet connector is on when there is a valid Ethernet
link, and blinks when network activity is detected.
The yellow Speed LED on the lower right of the Ethernet connector is on when the transmission speed is
100 Mbps, and off when the transmission speed is 10 Mbps or there is no link.
Factory reset button
Use the factory reset button to reset network configuration settings to the factory default values.
Refer to Restoring factory default network settings on page 10 to learn about resetting these values.
Signal connections
Analog input
You can configure the analog inputs for SE or DIFF mode. The input voltage range is software selectable for
±10 V, ±5 V, ±2 V, or ±1 V.
With SE mode, connect up to eight inputs to CH0xto CH3x. SE mode requires two wires:
Connect one wire to the signal you want to measure (CH#x).
Connect one wire to the analog ground reference (AGND).
With DIFF mode, connect up to four differential inputs to CH0H/CH0L to CH3H/CH3L. DIFF mode requires
two wires plus a ground reference:
Connect one wire to the high/positive signal (CHxH).
Connect one wire to the low/negative signal (CHxL).
Connect one wire to the analog ground reference (AGND).
Floating voltage source
When connecting DIFF voltage inputs to a floating voltage source, make sure the DIFF input channel has a DC
return path to ground. To create this path, connect a resistor from each low channel input to an AGND pin. A
value of approximately 100 kΩ can be used for most applications.
Leave unused input channels either floating or tied to an AGND terminal. Source impedances should be kept as
small as possible to avoid settling time and accuracy errors.

OM-NET-1608 User's Guide Functional Details
14
Figure 4 shows DIFF channels 0-3 connected to a ground path resistor.
Figure 4. DIFF connections with ground path resistor
Channel-Gain queue
The channel-gain queue feature allows you to configure a list of channels, modes, and gains for each scan. The
settings are stored in a channel-gain queue list that is written to local memory on the device.
The channel-gain queue list contains one or more channel numbers, modes, and range settings. You can
configure up to 8 elements. The channels can be listed in any order, and can include duplicate channels for
sampling at different ranges.
An example of a 4-element list is shown in the table below.
Sample channel gain queue list (SE mode)
Element
Channel
Range
0
CH5
BIP5V
1
CH1
BIP10V
2
CH3
BIP1V
3
CH5
BIP5V
Carefully match the gain to the expected voltage range on the associated channel or an over range condition
may occur. Although this condition does not damage the device, it does produce a useless full-scale reading,
and can introduce a long recovery time due to saturation of the input channel.
For more information about analog signal connections
For more information about analog input connections, refer to the OMB-DAQ-2400, OMB-DAQ-RACK,
OM-NET, OM-USB, OM-WEB, and OM-WLS Series General Guide to DAQ Signal Connections (this document
is available on our website at www.omega.com/manuals/manualpdf/M4830.pdf).

OM-NET-1608 User's Guide Functional Details
15
Analog output
Two 16-bit analog outputs are available at AOUT0 and AOUT1.
Each analog output channel has an output range of ±10 V. Throughput is system-dependent.
The D/A is software-paced. Each 16-bit analog output (AOUT0 and AOUT1) can be updated simultaneously at
rates from 1000 S/s to 5000 S/s. This is the typical throughput when the device and host are both hard-wired to
the same local network. Typical throughput is not guaranteed if a wireless connection is involved or data is sent
over the Internet.
External clock I/O
The OM-NET-1608 provides one external clock input (AICKI) and one clock output (AICKO) for analog inputs.
You can connect an external clock signal to AICKI.
When using the internal clock, AICKO outputs the ADC scan clock.
Digital I/O
You can connect up to eight digital I/O lines to DIO0 through DIO7. Each digital channel is individually
configurable for input or output. The digital I/O terminals can detect the state of any TTL-level input and offer .
advanced BiCMOS output.
Refer to the schematic shown in Figure 5.
Figure 5. Schematic showing switch detection by digital channel DIO0
If you set the switch to the +5 V input, DIO0 reads TRUE (1). If you move the switch to GND, DIO0 reads
FALSE (0).
Pull-up/down configuration
Unconnected inputs are pulled high by default to 5 V through 47 kΩ resistors via jumper W3 on the circuit
board (see Figure 6).
1
W3 pull-up/pull-down jumper
Figure 6. W3 jumper location
The pull-up/pull-down voltage is common to all 47 kΩ resistors. Jumper W3 is configured by default for pull-
up.

OM-NET-1608 User's Guide Functional Details
16
Figure 7 shows the jumper configured for pull-up and pull-down.
Caution! The discharge of static electricity can damage some electronic components. Before touching the
board, ground yourself using a wrist strap or touch the computer chassis or other grounded object
to eliminate any stored static charge.
Figure 7. W3 jumper configurations
For more information about digital signal connections
For general information about digital signal connections and digital I/O techniques, refer to the
OMB-DAQ-2400, OMB-DAQ-RACK, OM-NET, OM-USB, OM-WEB, and OM-WLS Series General Guide to
Signal Connections (available on our web site at www.omega.com/manuals/manualpdf/M4830.pdf).
Trigger input
The TRIG terminal is an external digital trigger input. The trigger mode is software selectable for edge or level
sensitive.
Edge sensitive mode is configurable for rising or falling edge.
Level sensitive mode is configurable for high or low level.
The default setting at power up is edge sensitive, rising edge.
Counter input
The CTR terminal is a 32-bit event counter that can accept frequency inputs up to 10 MHz. The internal counter
increments when the TTL levels transition from low to high.
Power output
The +VO terminal can output up to 10 mA maximum. You can use this terminal to supply power to external
devices or circuitry.
Ground
The analog ground (AGND) terminals provide a common ground for all analog channels.
The digital ground (GND) terminals provide a common ground for the digital, counter, timer, and clock
channels and the power terminal.

OM-NET-1608 User's Guide Functional Details
17
Mechanical drawings
Figure 8. OM-NET-1608 circuit board dimensions

OM-NET-1608 User's Guide Functional Details
18
Figure 9. Bottom enclosure dimensions

OM-NET-1608 User's Guide Functional Details
19
Figure 10. Top enclosure dimensions
DIN-rail compatible
The OM-NET-1608 can be mounted on a DIN rail using the OM-NET-DINRAILKIT accessory. Refer to our
website for more information.

20
Chapter 4
Specifications
All specifications are subject to change without notice.
Typical for 25 °C unless otherwise specified.
Specifications in italic text are guaranteed by design.
Analog input
Table 1. General analog input specifications
Parameter
Condition
Specification
A/D converter type
Successive approximation
ADC resolution
16 bits
Number of channels
4 differential, 8 single-ended
Software-selectable
Input voltage range
±10 V, ±5 V, ±2 V, ±1 V; software-selectable per channel
Absolute max input voltage
CHx relative to AGND
±20 V max (power on)
±12 V max (power off)
Input impedance
1 GΩ (power on)
1200 Ω (power off)
Input bias current
±10 nA
Input bandwidth
All input ranges,
small signal (–3 dB)
700 kHz
Input capacitance
60 pf
Max working voltage (signal
+ common mode)
±10 V range
±10.2 V max relative to AGND
±5 V range
±10.2 V max relative to AGND
±2 V range
±9.5 V max relative to AGND
±1 V range
±9.0 V max relative to AGND
Common mode rejection ratio
(fIN = 60 Hz, all input
ranges)
86 dB
Crosstalk
Adjacent differential mode
channels, DC to 10 kHz
–75 dB
Input coupling
DC
Sample rate
0.019 Hz to 250 kHz
Software-selectable
Trigger source
TRIG (see External trigger on page 24)
Sample clock source
Internal A/D clock or external A/D clock (AICKI pin)
Internal sample clock stability
±50 ppm
Internal sample clock
timebase
80 MHz timer with 32-bit period
(available frequencies are 80 MHz / integer period)
Throughput
Software paced
1000 to 5000 S/s typ, on local network (Note 1)
Hardware paced
250 kS/s max
Channel gain queue
Up to 8 elements
Software-selectable channel and range for each queue
element
Warm-up time
15 minutes min
Note 1: This is the typical throughput when the device and host are both connected by Ethernet to the same local
network. The throughput can vary significantly if a wireless connection is involved or data is sent over the
internet and is not guaranteed.