The iNET-400 multichannel data acquisition system is a low cost card cage that attaches to Windows
computers via USB 2.0. The advantage of a card cage is that you
can select which I/O modules to install as needed to build a
customized system. The instruNet card cage typically has one A/D
measurement module and additional modules provide signal
conditioning. The conditioned analog signal is routed to the A/D
module via the backplane. This is dramatically different from
comparable systems which place A/D measurement electronics on
The advantage of the iNET-400 topology is cost. After the
1st module is installed, additional iNET-400 channels are conditioned
at a very low cost per channel. iNET-400 measurement modules
have universal inputs that enable one to directly connect each channel
to one of: thermocouple, thermistor, strain gage, load cell, counter/timer,
RTD, voltage, current, resistance and accelerometer.
Absolute accuracy for all of these sensor types is specified. In some
cases, the end user adds an external shunt resistor. The advantage of
universal inputs is cost.
Low Cost 4/8/12/16-Slot Card Cages
The iNET-400 card cage provides 4 slots, and multiple iNET-400’s
can be bolted together by the end user, side-by-side, to create an
8, 12, or 16 slot system. In many applications, one iNET-400
with 4 slots is sufficient.
The iNET-400 card cage is 15 D x 11 W x 14 cm H
(6 x 4.5 x 5.6") in size. The slots are numbered such
that #1 is the left-most slot, #2 is to the right of #1, and
so forth and so on. Cards are held into position with
jackscrews that are tightened with a slotted
screwdriver. Slot #1 is a special slot and is used to
interface to a computer.
The iNET-410 card slides into slot #1 and then cables
to the computer via a DB25 cable that connects to an
instruNet controller. Also, an iNET-300 Power Adaptor
cable is used to route power from an iNET-312-8
desktop power supply to the iNET-410 interface card
in slot #1, which in turn routes that power to the card
cage backplane (i.e. pcb at back of card cage that
attaches to all cards). See PDF attached for illustrated diagram.
The iNET-400 Card Cage needs at least one
iNET-430 A/D card if analog voltages are to be
measured. The iNET-430 cards includes an A/D
converter and serves this purpose.
The iNET-420 and iNET-423 cards contain various
signal conditioning circuits and route signals along the
backplane to the iNET-430 for measurement. This
happens automatically and does not require
programmer intervention, other than insertion of cards
and attaching end user signals to the card’s front
iNET-240 instruNet DSP Card
Each instruNet Network is controlled by an instruNet
DSP controller card that attaches to a Microsoft
Windows computer. The iNET-240 attaches to a free
USB 2.0 high speed port (requires Windows ≥ XP
Sp2). Each Controller is an independent computer in
itself that utilizes a powerful 32-bit DSP processor and
onboard RAM to control all aspects of data acquisition
along its network. All real-time tasks are off-loaded to
this processor, therefore the host computer is not
burdened with real-time issues. Between 1 and 4
controllers can be installed, space permitting, since
each controller operates independently.
Connect up to 8 iNET-400 Card Cages
Each instruNet network supports up to 8 instruNet
iNET-400 card cages.
These devices are connected in a daisy-chain
configuration to form a chain of Devices. Each network
can be up to 300 meters long. All networks are
anchored with an instruNet Terminator at the far end,
and an instruNet Controller at the near end. This
makes instruNet a cost effective method for designing
large scale, high speed, multi-channel data acquisition systems.
instruNet Version ≥ 3.0 software requires Windows XP, Vista, or 7
(XP/VS/7) computer with at least 256MB of RAM Memory and at least
256 MB of free disk space. The iNET-240 USB controller requires
32-bit or 64-bit Windows XP SP2 (service pack #2) or newer.
instruNet ≥ v3.0 software does not run under Linux, does not run on
Windows 95/98/Me/Nt/2K computers and does not run on
iNET-410 Communications Card
The iNET-410 communications card connects an
iNET-400 card cage to a Windows computer via an
instruNET iNET-240 USB controller. The iNET-410
plugs into the left-most slot (slot #1) of an iNET-400
card cage. One and only one iNET-410 is required per
iNET-400 card cage when working with instruNet
controllers. The iNET-410 provides the following
features: • Two DB25 connectors allow daisy-chaining multiple
iNET-400 card cage devices to one instruNet
controller card. • Front panel red power light shows presence of 5V,
12V and -12V power. • Front panel green I/O light blinks when computer
communicates with card cage. • Includes one DB25 male to female 3 m (10') cable.
iNET-420 Analog I/O Module
The iNET-420 provides 20 single-ended (SE)/10
differential (DI) voltage input channels and 4 universal
digital I/O (20 mA sink, -10V to 30V) and requires the
iNET-430 A/D module to measure voltages. The iNET-
420 connects directly to voltage, thermocouple,
thermistor, RTD, load cell, strain gage, potentiometer,
current and resistance inputs.
iNET-423 Analog I/O Module
The iNET-423 provides 6 differential (DI) voltage
input channels, 4 universal digital I/O (20 mA sink,
-10 to 30V) and requires the iNET-430 A/D module
to measure voltages. The iNET-423 connects directly
to voltage, thermocouple, thermistor, RTD, load cell,
strain gage, potentiometer, current and resistance
inputs. Each input channel passes through it’s own
amplifier with a software selectable gain of 1 or
64 and optional low pass filter.
iNET-430 A/D Module
The iNET-430 provides 16 single-ended (SE)/8
differential (DI) voltage input channels with a 16-bit
A/D converter, 2 precision analog voltage outputs
(±10V, 14-bit D/A), 2 analog voltage outputs
(0 to 10 V output, 8-bit D/A) and 4 universal digital
I/O (20 mA sink, -10 to 30 V). The iNET-430 connects
directly to voltage, thermocouple, thermistor, RTD,
load cell, strain gage, potentiometer, current and
iNET-460 Digital I/O Module
The iNET-460 provides 12 universal digital I/O
(20 mA sink, -10 to 30 V) and 16 digital I/O
(200 mA sink, -10 to 30 V).
NET-400 cards are installed by the end user into an instruNET card cage that is 4, 8, 12 or 16 slots
wide. Each card is 13 x 2.5 x 13 cm (5.1 x 1.0 x 5.1") in size. Below is a list of available cards.
Number of Channels
Low Pass (KHz)
Number of Channels
Number of Channels
The iNET-410 connects card cage to windows computer via an instruNet controller.
The following table shows maximum aggregate sample rates for an iNET-240 USB controller attached to an
iNET-400 card cage. To calculate the sample rate for each channel, divide by the number of channels attached to
the iNET-240 controller. For example, if the maximum aggregate sample rate is 166K samples/sec/controller, and
you digitize 4 channels, then you could digitize each channel at 41Ks/sec/channel. Up to four iNET-240 controllers
can be attached to a computer to increase total system throughput.
Max Aggregate Sample Rate per Controller (K samples/sec/controller)
±10mV.. ±80mV Range
Sensor Connection Table
The table below shows which sensors directly connect to each hardware product. The numbers in the table
refer to number of channels. The following sensors require an external shunt resistor: RTD, thermistor,
resistance measurement, current measurement, 1/4 bridge strain gage, and 1/2 bridge strain gage.
Thermocouple sensors require an iNET-510 Wiring Box attached to the iNET-400 card.
No. of Slots: Each iNET-400 supports up to four cards. Multiple
iNET-400's can be bolted together side-by-side to create an 8, 12, or
16 slot system Material: Solid aluminum construction Dimensions:
15 D x 11 W x 14 cm H
(6 x 4.5 x 5.6") Mounting: Place on desktop, affix to DIN rail, 19" rack, or wall mount
No. of Channels:
iNET-420: 20 single-ended (SE)/10 differential (DI) iNET-423: 6 differential (DI) iNET-430: 16 single-ended (SE)/8 differential (DI) A/D Converter: 16-bit (iNET-430 only) Voltage: See voltage accuracy/range charts (on PDF) Thermocouple: J/K/T/E/R/S/B/N/C/G/D Thermistor: 2252 Ω (OMEGA 44000 Series) RTD: 100 Ω , 500 Ω , 1 kΩ platinum Load Cell: 10 kg, 25 kg, 100 kg, 250 kg, 1000 kg, 5000 kg Strain: 350 Ω (1/4 bridge, half bridge or full bridge), 1 kΩ
(1/4 bridge) Potentiometer: 10 kΩ , 50 kΩ Current: ±80 uA, ±120 uA, ±500 uA, ±600 uA, ±800 uA, ±1.2 mA, ±2.5
mA, ±12 mA, ±24 mA, 0 to 24 mA Resistance: 0 to 33 Ω, 0 to 100 Ω,
0 to 330 Ω, 0 to 1 kΩ, 0 to 3300 Ω,
0 to 10 kΩ Common Mode Voltage: ±10 Vdc
(iNET-420 and iNET-430), ±5 Vdc (iNET-423) Crosstalk: <-80 dB typical Input Impedance: 100 MΩ
iNET-430 PRECISION ANALOG
No. of Channels: 2 Resolution: 14-bit Range: ±10.1V Output Current Drive: ±4 mA
No. of Channels: 2 Resolution: 8-bit Range: 0 to 10.1V Output Current Drive: ±4 mA
No. of Channels: 4 universal digital I/O (20 mA sink, -10 to 30V) Working Voltage: -10 to 30 Vdc "0" Input Voltage: -10 to 0.65V "0" Input Current: Amps = (4.5V - Vin)/3900 "1" Input Voltage: 2.1 to 30 Vdc "1" Input Current: <1.4 mA "0" Output Voltage: <0.8V @ < 5 mA; < 2V @ <20 mA "1" Output Voltage: 3.9 to 4.5V "1" Output Current: See "1" input current Pull-Up Resistor: 3.9 kΩ ±10% Schmitt Trigger Input: Yes
Operating Environment: 1 to 45°C (34 to 113°F), <90% RH Storage Temperature: -20 to 70°C (-4 to 158°F)
Required: +5 Vdc, ±12 Vdc required (supplied by iNET-312-8) User Available: 3.3 Vdc, 5 Vdc, ±12 Vdc
† All amounts shown in EUR, GBP, or USD Note: Comes complete with CD, including instruNet World Software and user manual. Ordering Example: (1) INET-555-EU Starter system, with 230Vac Power supply (including iNET-240, iNET-430, iNET-510, iNET-400, iNET-410 and iNET-312-8), £675.00