Omega Products iNET-240 User Manual

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Expandable Modular Data Acquisition System iNET-400 Series

iNET-555

990

Complete Starter

System

⻬ USB 2.0 High Speed Data

Acquisition Hardware for Windows®≥XP SP2, Vista or 7 (XP/VS/7)

⻬ Analog and Digital Input

and Outputs

⻬ Free instruNet World Software ⻬ Directly Connects to

Thermocouple, RTD, Thermistor, Strain Gage, Load Cell, Voltage, Current, Resistance and Accelerometer Input’s

⻬ Reduce Noise by Placing

Boxes Near Sensors and up to 1000' From Noisy Computer

⻬ Digitize Any Combination

of Channels at 166,000 Samples Per Second Aggregate

⻬ Each Channel has

Independently Programmable Analog Filters, Integration Time, Voltage Range, and Sample Rate; Programmable Digital Filters on All Channels (LP, HP, BP, BS)

The iNET-400 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.

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Shown smaller than actual size.

iNET-400 card cage, $390.

This is dramatically different from comparable systems which place A/D measurement electronics on each module. 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.

iNET-410, $190.

4/8/12/16-slot card cages

4 slots

8 slots

12 slots

16 slots

iNET-430, $490.

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Connect Directly to Common Sensors

Data acquisition cards connect directly to thermocouple, thermistor, strain gage, load cell, counter/timer, RTD, voltage, current, resistance and accelerometer.

Voltage

Resistance

Current

Strain Gage

RTD

Thermistor

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). This is illustrated in the below 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 panel connectors.

Windows PC

iNET-300 cable (included with iNET-312-8)

iNET-240

110 to 220 Vac

Thermocouple

iNET-312-8 Power supply

i410

i430

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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.

instruNet Network

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.

iNET-240, $290, USB controller, shown smaller than actual size

instruNet terminator

iNET-400

card cage

Windows PC

DB-25 connector (male)

iNET-240 instruNet

controller

DB-25 cable DB-25 connector (female)

iNET-400

card cage

instruNet Version ≥ 3.0 software requires Windows XP, Vista, or 7 (XP/VS/7) computer with at least

Summary of Computers Compatible with instruNet

Controller

Model No. Type Size Computer Required

iNET-240 USB 2.0 4 x 2 x 1" 32-bit or 64-bit Windows ≥ XP SP2,

Vista or 7 (XP/VS/7) Computer with 1 available USB 2.0 High Speed port (480Mbaud).

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 Macintosh computers.

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