The OM-NET-TC thermocouple
input data acquisition module
offers high-accuracy temperature
measurement with an Ethernet
interface. The device offers the
best value per channel and the
best possible accuracy because
the accuracy of the internal
measurement electronics exceeds
the accuracy specifications of
the thermocouple sensors. The
OM-NET-TC is functionally
equivalent to an OMEGATM OM-USB-TC
module (USB interface to computer)
which makes application migration
very easy.
Ethernet Interface
The OM-NET-TC has a built-in highspeed
communication port. Users
can remotely access and configure
the device with software over the
Internet.
Thermocouple Input
Connect up to eight differential
thermocouple (TC) input channels
to the OM-NET-TC. The OM-NET-TC
supports a maximum sample rate of
4 S/s per channel, and thermocouple
types J, K, T, E, R, S, B and N.
Thermocouple types are softwareselectable
per channel.
Cold-Junction
Compensation
The OM-NET-TC has two
high-resolution cold-junction
compensation (CJC) sensors (one
per four thermocouple inputs).
Open-Thermocouple
Detection
The OM-NET-TC is equipped with
open-thermocouple detection
(OTD) for all thermocouple input
channels. With OTD enabled,
users can monitor for broken or
disconnected thermocouple inputs.
Digital I/O
The OM-NET-TC has eight digital
I/O channels that are electrically
isolated from the analog circuits.
Each bit is individually configurable
for input or output. Data can be
transferred at rates up to 5 kS/s
when the device and host are
connected by Ethernet to the same
local network. Typical throughput
is system-dependent. All DIO
channels are pulled high by default
to 5V through 47 kO resistors with
a jumper on the circuit board. Each
jumper configures the digital port
for pull-up or pull-down.
Temperature Alarms
Each digital output can be
optionally configured as an alarm
for each thermocouple input.
When an alarm is enabled, the
output line associated with the
alarm is driven to the appropriate
state determined by the alarm
options and input temperature.
Use the alarm outputs to control a
device or application that indicates
when a temperature threshold has
been exceeded, or to indicate an
open thermocouple condition.
Counter Input
The 32-bit event counter pin
counts TTL pulses, and accepts
frequency inputs up to 10 MHz.
Power
The OM-NET-TC requires external
power from the 5V, 1A power
adapter (OM-NET-PS) included
with the device.
Calibration
The OM-NET-TC is factorycalibrated
using a NIST-traceable
calibration process. Specifications
are guaranteed for one year.
For calibration beyond one year,
Contact Omega and return the
device for recalibration.
Software
The OMB-NET-TC module
ships with an impressive array
of software, including the new
TracerDAQ®, a full-featured, out-ofthe-
box data logging, viewing, and
analysis application. Driver support
and detailed example programs
are included for Universal Library
programming libraries for Microsoft®
Visual Studio® programming
languages, and other languages,
including DASYLab®, and ULx for
NI LabVIEW® (comprehensive
library of VIs and example
programs compatible with 32-
bit and 64-bit LabVIEW 2010 or
later) and InstaCalTM installation,
calibration and test utility-powerful
solutions for programmers and
nonprogrammers alike. These
modules operate under Microsoft
Windows® VISTA/7/8/10 (32-bit and
64-bit) operating systems.
The OMB-NET-TC data acquisition
module is supplied with TracerDAQ
software which is a collection of
four virtual instrument applications
used to graphically display and
store input data and generate
output signals:
• Strip Chart—Log and graph
values acquire from analog
inputs, digital inputs, temperature
inputs and counter inputs
• Oscilloscope—Display values
acquired from analog inputs
• Function Generator—Generate
waveforms for analog outputs
• Rate Generator—Generate
waveforms for counter outputs
TracerDAQ PRO is an enhanced
version of TracerDAQ and is
available as a purchased upgrade
(SWD-TRACERDAQ-PRO).
A comparison of some of the
features included in TracerDAQ vs
TracerDAQ Pro (see Spec page PDF).
Specifications
(Typical for 25°C unless
otherwise specified) THERMOCOUPLE INPUT A/D Converter Type: Delta-Sigma A/D Resolution: 24-bit Number of Channels: 8 differential
channels Isolation Between Any Thermocouple
Input Channel and Digital/Chassis Ground: 500 Vdc absolute max Channel Configuration: Software selectable
for thermocouple types
J, K, T, E, R, S, B, N (factory default
configuration is type J). Channel
configuration is stored on EEPROM
external to the isolated microcontroller
by the firmware whenever any item is
modified. Modification is performed by
commands issued from an external
application, and the configuration is
made non-volatile through the use of
the EEPROM. Differential Input Voltage Range:
±0.128V (calibration is performed at
±70 mV) Absolute Maximum Input Voltage
(Between any Two TCx Inputs): ±25V
(power on), ±25V (power off) Differential InputImpedance: 40 MΩ Input Current: Open Thermocouple Detect
Disabled: 1 nA Open Thermocouple Detect
Enabled: 65 nA Common Mode Rejection
(fin = 50 Hz or 60 Hz): 110 dB Noise Rejection
(fin = 50 Hz or 60 Hz): 75 dB Input Bandwidth: 10 Hz Crosstalk Between Any Two
Thermocouple Inputs: -90 dB Sample Rate: 4 Hz max (per channel).
The enabled thermocouple inputs are
continuously converted at the maximum
A/D converter rate. If channels are
enabled and have an open thermocouple
connection the sampling rate will be lower. Input Noise: 250 nV rms Gain Error: 0.006% FSR Offset Error: 3 µV Measurement Sensitivity (Smallest
Change in Temperature That Can Be
Detected): Thermocouple Type J,K,T,E,N: 0.09°C Thermocouple Type R,S: 0.11°C Thermocouple Type B: 0.13°C Warm-Up Time: 20 minutes min Open Thermocouple Detect Response
Time: 1 s CJC Sensor Accuracy (0 to 45°C):
±0.20°C typ, ±0.40°C max DIGITAL I/O Digital Type: 5V TTL input/ CMOS
output Number of I/O: One port of 8 bits,
shared with temperature alarms
Configuration: Each bit can be
independently configured for input or
output Pull-Up Configuration: All pins pulled
up to 5V using 47 K resistors (default).
Can be changed to pull-down using an
internal jumper Digital I/O Transfer Rate (System-
Paced): 100 to 5000 port reads/writes
or single bit reads/writes per second
typ, on local network. 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, and typical throughput is
not guaranteed if a wireless connection
is involved or data is sent over the
internet Alarm Functionality: Any combination
of DIO bits may be configured to become
outputs and go to defined values when
an Ethernet connection with a host is
established or lost Power On and Reset State: All bits are
input unless the alarm functionality is
enabled for them Input High Voltage Threshold: 2.0V min Input High Voltage Limit: 5.5V absolute
max Input Low Voltage Threshold: 0.8V max Input Low Voltage Limit: -0.5V absolute
min, 0 V recommended min Output High Voltage: 4.4V min
(IOH = -50 µA), 3.76V min
(IOH = -24 µA) Output Low Voltage: 0.1V max
(IOL = 50 µA), 0.44V max (IOL = 24 µA) Power On and Reset State: Input TEMPERATURE ALARMS Number of Alarms: 8 (one per digital
I/O line) Alarm Functionality: Each alarm
controls its associated digital I/O line
as an alarm output. When an alarm is
enabled, its associated I/O line is set
to output and driven to the appropriate
state determined by the alarm options
and input temperature. The alarm
configurations are stored in non-volatile
memory and loaded at power on Alarm Input Modes:
• Alarm when input temperature =T1,
reset alarm when input temperature < T2
• Alarm when input temperature =T1,
reset alarm when input temperature
>T2
• Alarm when input temperature is T2
• T1 and T2 may be independently set
for each alarm Alarm Error Modes:
• Alarm on temperature reading only
• Alarm on temperature reading or
open thermocouple error
• Alarm on thermocouple error only Alarm Output Modes:
• Disabled, digital I/O line may be used
for normal operation
• Enabled, active high output (DIO line
goes high when alarm condition is met)
• Enabled, active low output (DIO line
goes low when alarm condition is met) Alarm Latency: 1 second (Alarm
settings are applied when changed
and at power-ON. Temperatures
are converted on enabled channels
and processed for alarm conditions
regardless of the communications
connectivity) COUNTER Pin Name: CTR Counter Type: Event counter Number of Channels: 1 Input Type: Schmitt trigger, 47 kO pulldown
to ground Input Source: CTR screw terminal
Resolution: 32 bits Schmitt Trigger Hysteresis: 0.6V min,
1.7V max Input High Voltage Threshold: 1.9V
min, 3.6V max Input High Voltage Limit: 5.5V
absolute max Input Low Voltage Threshold: 1.0V
min, 2.3V max Input Low Voltage Limit: -0.5V
absolute min, 0V recommended min Input Frequency: 10 MHz max High Pulse Width: 50 ns min Low Pulse Width 50 ns min MEMORY EEPROM: 4096 bytes POWER External Power Supply: 5V, 1A (via
included AC adapter) Supply Current (Quiescent Current):
177 mA typ (this is the total quiescent
current requirement for the device that
includes the LEDs and does not include
any potential loading of the digital I/O
bits or +VO terminal User Output Voltage Range
(Available at +VO Terminal): 4.40V
min to 5.25V max, assumes supplied
AC adapter is used User Output Current (Available at
+VO Terminal): 10 mA max NETWORK Ethernet Connection
Ethernet Type: 100 Base-TX,
10 Base-T Communication Rates: 10/100 Mbps,
auto-negotiated Connector: RJ-45, 8 position Cable Length: 1 meter standard and up
to 100 meters (328') max Additional Parameters: HP auto-MDIX
support NETWORK INTERFACE Protocols Used: TCP/IP (IPv4 only), UDP Network Ports Used: UDP:54211
(discovery), UDP:6234 (bootloader
only), TCP:54211 (com¬mands)
Network IP Configuration: DHCP + linklocal,
DHCP, static, link-local Network Name: E-TC-xxxxxx, where
xxxxxx are the lower 6 digits of the
device MAC address Network Name Publication: By NBNS
(responds to b-node broadcasts,
therefore only available on the local
subnet) NETWORK FACTORY
DEFAULT SETTINGS Factory Default IP Address:
192.168.0.101 Factory Default Subnet Mask:
255.255.255.0 Factory Default Gateway: 192.168.0.1 Factory Default DHCP Setting: DHCP
+ link-local enabled NETWORK SECURITY Security Implementation: TCP
sockets are not opened unless
application sends the correct PIN code
(stored in non-volatile memory, may be
changed by user, default value 0000) Number of Concurrent Sessions: 1 Vulnerabilities: TCP sequence number
approximation vulnerability LED DISPLAYS AND THE
FACTORY RESET BUTTON Factory Reset Button: Used to reset
the network configuration settings to the
factory default values. Power LED (Top) 4.2V < Vext <5.6V: On Vext <4.2V, Vext >5.6V: Off (power fault) Activity LED (Bottom): On when there
is a valid host connection and blinks
when a command is received Ethernet Connector LEDs Left, Green:
Link/activity indicator; on when there is
a valid Ethernet link and blinks when
network activity is detected. Right, Yellow: Speed indicator; on for
100 Mbps, off for 10 Mbps or no link. ENVIRONMENTAL Operating Temperature Range:
0 to 55°C max (32 to 131°F) Storage Temperature Range:
-40 to 85°C max (-40 to 185°F) Humidity: 0 to 90% RH non-condensing
max Screw Terminal Connectors
Connector Type: Screw terminal Wire Gauge Range: 16 to 30 AWG MECHANICAL Dimensions:
117.9 L × 82.8 W × 29.0 mm H
(4.64 × 3.26 × 1.14") Weight: 0.4 kg (0.88 lb)
† All dollar amounts on this site are shown in Singapore currency.
Note: Comes complete with 1 m (3.2') CAT-6 Ethernet cable, universal AC adapter, quick start guide, software and operator’s manual on CD. Ordering Example: OM-NET-TC 8-channel thermocouple input Ethernet data acquisition module.
Keywords:Ethernet Data Acquisition Module, 8 Channel Data Acquisition Module, Temperature Data Acquisition, Thermocouple Data Acquisition, Ethernet Interface