Description

The ADU71 USB to Current Output Interface (Transmitter) is a USB bus powered current loop source for driving 4-20mA or 0-20mA input devices. The ADU71 can also be used with external resistors to provide 1-5VDC, 0-5VDC or 0-10VDC signals for variable frequency drives, valves etc. The ADU71 internally generated 24VDC loop supply eliminates the need for an external loop power supply. This low-cost USB to Current Output Interface is easy to use with VB, VB.NET, Visual C++, C , MATLAB, LABView etc. via standard HID drivers included with Windows. A mini-driver (DLL) is also provided allowing control using standard ASCII commands using familiar readfile, writefile commands. The ADU71 includes a 10' USB cable and is available in a flange mount enclosure with a DIN rail mount option.

Click here to view sample connection diagrams.

Download the ADU 71 Operating Commands

Download the ADU 71 User Manual

Download ADU71 3D STEP files for FLANGE or DIN mounting types.

Key Features

USB to standard 0-20mA or 4-20mA powered current loop output .
Drives 4-20mA, 0-20mA, devices or 1-5VDC, 0-5VDC or 0-10VDC inputs using external resistors.
Ideal for controlling VFD's, valves, etc.
Internal 24VDC loop power supply supply derived from USB bus.
Programmable slew rate from 1ms to 10 seconds
Programmable host watchdog functions.
Loop error detection.
Over temperature protection.
2500V Isolation to loop.
Bus powered
High retention USB Connector
CE Marked
Bi-colour LED status indicator.
High quality cage-clamp type terminal blocks.
Uses standard HID drivers included with Windows 32-bit or 64-bit
Mini-driver (DLL) provided. See Programming Page for details
Meets IEC61000-4-2 ESD protection for USB port.
Available in flange (standard) or DIN rail mount.

Typical Applications

Industrial Instrumentation
VFD or Valve Controller
4-20mA Actuator Controller
SCADA Systems
OEM Instruments Embedded Control

Technical Specification

ADU71 Features
Supply Voltage	NONE (Bus Powered)
USB Supply Current	70mA Typical 100mA Max ( 24V loop supply disabled) 180mA Typical 200mA Max ( 24V loop supply enabled)
Operating Temperature	-25C Min to 85C Max
Isolation	2500V

Current Loop Output
Resolution	16 Bits
Range	0-20mA or 4-20mA programmable
Total Unadjusted Error	-0.3%FSR MIN +0.3% FSR MAX
Full Scale Error	-0.2% FSR MIN +0.2% FSR MAX
Temperature Stability	+/- 16 ppm /Degree C
Slew Rate	1ms to 10s programmable

Internal Loop Power Supply
Voltage	24 Volts Nominal
Isolation	2500V
Loop Compliance Voltage	21VDC

Special Functions
Internal Loop Power Supply	24VDC
Mounting Options	Flange Mount (STANDARD), DIN Rail