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Product Groups
USB Interface Modules
TRODEKS Engineering | Thermocouples, Pressure Transducers, Flow Meters, PID Controllers
  • Complete Data Acquisition Systems
  • Analog and Digital I/O Models Available
  • USB Interface
  • Modbus® RTU Protocol
  • Up to 25 Conversions per Second
  • 500 Vrms Analog Input or Analog Output Isolation
  • 16-Bit Analog Input Measurement Resolution
  • Continuous Self-Calibration; No Adjustments Required
  • Programmable Analog Input Digital Filters
  • Requires 10 to 30 Vdc Unregulated Supply
  • Removable Screw Terminal Plug Connectors Supplied
  • Process Monitoring and Control
  • Data Logging to any Host Computer
  • Product Testing
 Manuals (contact with email : [email protected])


The D8000 series USB interface modules are a familyof complete data acquisition modules for use in processcontrol systems. The analog input models can measureprocess signals such as thermocouples, 4 to 20 mAcurrent loops, and discrete contact closures. The analogoutput models can generate voltage or current signalsfor controlling annunciators or valves. The digital inputand output models can sense the state of remote digitalsignals or control solid state relays. Complete dataacquisition systems can be created with ease with theD8000 modules and a host computer.

The modules provide direct connection to a wide varietyof sensors and annunciators such as thermocoupleprobes, 4 to 20 mA loops, and DC voltage. Theyperform all signal conditioning, linearization and containno internal pots or DIP switches. All user-selectablefeatures such as ranges, communications settings arestored in nonvolatile EEPROM, which maintains thesevalues even after power is removed.

The D8000 series USB interface modules connect toa host computer using a USB interface cable and theycommunicate using a virtual serial communications portusing the Modbus RTU protocol.

Use a USB cable to connect the D8000 to a hostcomputer. Plugging the cable into the computer willcreate a virtual serial port in the computer. The virtualserial port will be used by the host to communicate withthe module. Serial communication ports are supportedby almost all data acquisition and process controlprograms in the marketplace.

The Modbus RTU protocol is used to read and writedata values to the D8000 series modules. The ModbusRTU protocol is a serial protocol and communicateswith external devices through serial ports. The ModbusRTU protocol is widely recognized throughout the dataacquisition industry and is supported by almost allcommercial process control programs.

Multiple D8000 series modules can be connected toone host computer. A unique and separate serial portis created for each module that is connected. Theserial port approach provides instant compatibility withalmost all industry standard data acquisition programsthat support the Modbus RTU protocol.

With the D8000 series modules, anyone familiar witha personal computer can construct a data acquisitionsystem. This approach to data acquisition is veryflexible, easy to use and cost effective. The modulescan be mixed and matched to fit your application. Youdo not need engineering experience in complicateddata acquisition hardware to build a system.

The D8100 through D8400 series analog inputmodules contain seven differential analog inputchannels. Each module contains analog signalconditioning circuits that are optimized for a specificsignal input type. Signal types include DC voltage,4 to 20 mA current loops, and eight thermocoupletypes. Each input channel can be programmed toaccept a different signal input range.

The sensor signals are converted to digital datawith a microprocessor-controlled integrating A/Dconverter. Offset and gain errors in the analog circuitryare continuously monitored and corrected usingmicroprocessor techniques.

The analog input modules communicate the resultantdata values as 16-bit unsigned integer numbersthat represent a percentage of the full. The modulescontinuously convert data values at the rate of up to25 conversions per second and store the latest resultin a buffer. The data values are requested by sendinga Modbus query to the module. The D8000 seriesmodules will instantly respond by communicating thedata values back to the host processor.

The D8500 analog output modules contain two12-bit digital to analog converters (DAC) for generatingeither voltage or current output signals. The outputsignal type for each DAC is user-selectable and eachDAC is independently controlled via a host computerusing the Modbus RTU protocol. Four different analogoutput ranges are available, two voltage ranges and twocurrent ranges.

The D8500 analog output modules contain userselectablefeatures such as programmable outputslew rate, a communications watchdog timer andprogrammable startup signal value. They also includean 8-bit analog to digital converter for analog readbackthe output signal.

The communications watchdog timer can be usedto move the analog output signal to a known “safe”condition in the event of a communications failure.

The D8710 digital input modules contain 15 individualinputs for monitoring logic levels, contact closures, orother ON/OFF signals in a data acquisition system.Each digital input terminal contains a pull-up biasingresistor allowing for direct connection to a set ofcontacts. The input terminals can accept signalsbetween ±30 Vdc without damage.

The D8720 digital output modules contain 15 individualopen-collector transistor outputs for controllingannunciators, lamps, or other devices that require anON/OFF signal.

The D8720 digital output modules also containprogrammable features such as a communicationswatchdog timer and programmable startup signalvalues for each bit.

The communications watchdog timer can be usedto move the digital output signals to a known “safe”condition in the event of a communications failure.

The D8000 series modules are designed to easilyinterface with computers using a USB interface. TheUSB interface creates a virtual serial communicationsport on the host computer. All communications to andfrom the module, through the virtual serial port areperformed using the Modbus RTU protocol. A newserial port is added for each D8000 series module.

The D8000 series modules use the Modbus RTUprotocol for communications. The Modbus RTU binaryprotocol uses a master-slave technique, in which onlythe master device can initiate transactions. The slavedevices respond by supplying the requested data tothe master or by performing the requested action inthe query. The master can address any slave device.The returned messages are considered responsemessages. The supported master function codes are:

Modbus RTU Functions and Descriptions
01 – Read Coil Status
02 – Read Register Status
03 – Read Holding Registers
04 – Read Input Register (Analog Inputs)
05 – Force Single Coil
06 – Preset Single Register
0F – Force Multiple Coils
10 – Preset Multiple Registers

Modbus RTU protocol is one of the most widelysupported serial protocols in the data acquisitionmarket. Modbus RTU software drivers are availablefor almost every data acquisition software programavailable today. Thus providing instant connectivitybetween the D8000 modules and most dataacquisition software programs.

The D8000 series modules are initialized at thefactory using the Modbus RTU protocol. Userselectable features such as individual channel rangeselection and digital filters are easily configuredusing the D6000/D8000 series utility software. EachD8000 module must be properly configured beforeinstallation into a Modbus system.

UTILITY SOFTWAREComplimentary Utility Software is included with eachmodule. The software is compatible with Windowsoperating systems and distributed on CDROM.The Utility Software simplifies configuration of alluser selectable options such as device address,baud rate and filtering constants. The latest versionof our software is always available on our web site.

(Typical at +25°C and nominal power supply unlessotherwise noted)
Programmable Digital Filters: In analog input modules
Max CMV (Input to Output at 115 Vrms, 60 Hz): 500 Vrms
Setups: Stored in EEPROM
Unused Analog Input Channels: Software disable
Communications: Modbus RTU protocol
Interface: USB port
Supply Voltage: Unregulated 10 to 30 Vdc; protectedagainst power supply reversals
Operating Temperature Range: -25 to 70°C(-13 to 158°F)
Storage Temperature Range: -25 to 85°C(-13 to 185°F)
Relative Humidity: 0 to 95% RH non-condensing
Case: ABS thermoplastic, UL-94-5VA rated
Dimensions: 102 H x 152 W x 36 mm D (4 x 6 x 1.5")
Mounting Holes: 165 mm (6.5") on center
Connectors: Screw terminal barrier plug (supplied)

Number of Channels: 7 differential voltage inputs
Ranges: ±0.025V, ±0.05V, ±0.1V, ±1V, ±5V, ±10V
Resolution: 16-bit ADC, 25/20 conversions per second
Accuracy: ±0.05% of FS max
Span Tempco: ±50 ppm/°C max
Input Burnout Protection: To 250 Vac
Input Impedance: 20 MΩ min
Power Requirements: Serial = 1.4 W

Number of Channels: 7 differential current inputs
Range: ±20 mA
Resolution: 16-bit ADC, 25/20 conversions per second
Accuracy: ±0.05% of FS max
Span Tempco: ±50 ppm/°C max
Voltage Drop: 2.0V max
Input Impedance: <100 Ω (70 typical)
Power Requirements: Serial = 1.4 W

Number of Channels: 7 differential thermocoupleinputs
Thermocouple Types: J, K, T, E, R, S, B, and CRanges:
J: -200 to 760°C (-328 to 400°F)
K: -150 to 1250°C (-238 to 2282°F)
T: -200 to 400°C (-328 to 752°F)
E: -100 to 1000°C (-148 to 1832°F)
R: 0 to 1750°C (32 to 3182°F)
S: 0 to 1750°C (32 to 3182°F)
B: 0 to 1820°C (33 to 3308°F)
C: 0 to 2315°C (32 to 4199°F)
Thermocouple Accuracy
(Error From all Sources) from 0 to 40°C Ambient:
    J, K, T, E: ±1.5°C max
    R, S, B, C: ±3.5°C max (300°C to +F.S.)
Resolution: 16-bit ADC, 25/20 conversions per second
Input Impedance: 20 MΩ min
Cold Junction Compensation: Automatic
Lead Resistance Effect: <40 µV per 350 Ω
Indication: Open thermocouple and over rangeindication
Input Burnout Protection: To 250 Vac
Power Requirements: Serial = 1.4W

Number of Channels: 7 differential voltage,thermocouple, current inputs
Specifications: Equal to D8100, D8200 and D8300series

Number of Channels: Two analog outputs(programmable for voltage or current output)
Voltage Ranges: 0 to 10 Vdc, ±10 Vdc
Current Ranges: 0 to 20 mA, 4 to 20 mA
Update Rate: 250 conversions per second
Accuracy: ±0.1%
Resolution: 12-bit DAC resolution
Span Tempco: ±25 ppm/°C max
Settling Time to 0.1% FS: 1 mS
Communications: Watchdog timer
Current Output Compliance: ±12 Vdc
Voltage Output Drive: 5 mA max
Analog Output Signal Readback: 8-bit ADC
Isolation: 500 Vac, output common to system ground
Current Output Burnout: Protected to 250 Vac
Power Requirements: Serial = 2.1 W

Number of Channels: 15 digital inputs
Internal: 10K pull-up resistors on each bit;accept direct switch closure
Logic “0”: <1 Vdc
Logic “1”: >3.5 Vdc
Input Burnout: To ±30 Vdc without damage
Isolation: 500 Vac, input common to system ground
Power Requirements: Serial = 0.75 W

Number of Channels: 15 open-collector outputs to30 Vdc, 100 mA max
Vsat: +0.3 Vdc max at 100 mA
Short Circuit Protection: To 500 mA
Communications: Watchdog timer
Digital Output Update Rate: 4.5 Hz
Isolation: 500 Vac, output common to system ground
Power Requirements: Serial = 1.0W
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