RDAG12-8(H) Remote Analog Output Digital I/O Pod

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  • Remote intelligent analog output and digital I/O units with opto-isolated RS-485 serial interface to host computer
  • Eight 12-bit analog current (4-20mA) and voltage outputs
  • Software selectable voltage ranges of 0-5V, 0-10V, ±5V
  • Seven bits of digital I/O configured on a bit-by-bit basis as either inputs or high-current outputs.
  • Field connections accomplished via 50-pin removable screw terminals.
  • Onboard 16-bit 8031 compatible microcontroller with 32K SRAM and EEPROM
  • Watchdog circuit for reset on power-up and microprocessor failure
  • Protective metal T-Box for high-power model (RDAG12-8H)
  • Protective NEMA4 enclosure for harsh atmospheric and marine environments (RDAG12-8 only)
  • High-Power Model can drive loads up to 250mA per channel
  • Designed, made, supported, and manufactured in the USA
Last updated on January 24, 2024, 2:53 pm


In Stock


These units each contain eight independent 12-bit digital-to-analog converters (DACs) and amplifiers for voltage outputs and voltage-to-current conversion. The DACs may be updated in a channel-by-channel mode or simultaneously. There are eight channels of voltage output and eight corresponding channels of 4-20mA current output. The output voltage ranges are software selectable. Calibration is performed by software. Factory calibration constants are stored in the EEPROM memory and can be updated by disconnecting the I/O wiring and entering software calibration mode. The units have analog voltage ranges of 0-5V, 0-10V, and ±5V, all at up to 10mA. Model RDAG12-8 is packaged in a NEMA4-compliant enclosure.

Model RDAG12-8H is similar except that each DAC output can drive loads up to 250mA. RDAG12-8H is packaged in a non-sealed “T-Box” steel enclosure.

Both models also have seven digital input/output ports. Each port can be individually programmed to be an input or an output. Digital input ports can accept logic high input voltages up to 50V and are overvoltage protected to 200VDC. Output drivers are open-collector and can comply with voltages up to 50VDC user-supplied voltage. Each output port can sink up to 350mA but total sink current is limited to a cumulative 650mA for the seven bits.




Drivers and Downloads

Full list of available Downloads: Software Packages, Drivers, Manuals, and other documents

Information about our Free Software packages:

ACCES is proud to provide a full suite of software support with every Data Acquisition product. We are committed to supporting the most popular operating systems and platforms for our customers. Currently we are actively supporting XP -> 10, both 32 & 64 bit, including “Server 2008,” “Embedded,” and “Compact” flavors for all plug-and-play products including PCI, PCI Express, USB, and more. Many products continue to ship with support for additional operating systems such as DOS, Windows 95, 98, Me, NT4, and 2000.


Among the software we deliver with our products are sample programs in a wide variety of programming languages. These samples are used to demonstrate the software interfaces to our products — and many can be used as-is in your production environments, or to test functionality of the devices out-of-the-box. We’re currently actively supporting sample programs in Microsoft Visual C#, Visual Basic, Delphi, and Visual C/C++, with many devices including samples in Borland C/C++ 3.1 for DOS. Additionally we provide National Instruments LabVIEW compatible DLLs and many demonstration VIs for our devices.


Drivers for various operating systems are also provided, including active support for Windows XP -> 10 — all in both 32-bit and 64-bit flavors, and including consumer, server, and embedded varieties — as well as the 2.6 and newer Linux kernels and recent OSX / macOS versions. Many products continue to ship with driver support for Windows 95, 98, Me, NT4, and Windows 2000, but support for these operating systems is considered deprecated.

Setup Programs and Utilites

Our Data Acquisition devices also include a graphical setup utility that walks you through the process of configuring any option jumpers or switches on the device, as well as explaining a little about the various connectors present.

Many devices also include utility programs – little tools to make your use of the device easier, such as EWriter, a program that allows you to read and write data in the user-accessible EEPROM locations on all our USB data acquisitition products; or WinRISC, a “Really Incredibly Simple Communications” terminal program that lets you get started instantly with serial devices.

“Register Level” Documentation

Besides all this software in all these languages and operating systems ACCES has a policy of open and transparent development: none of our lowest-level “register” interfaces are hidden from you — we document every register in every bus card, every command in every serial board, and every usb control transfer in every USB Data Acquisition board. These lowest-level interfaces allow you to develop for our products in ANY operating system or language, regardless of our actively supporting it or having a driver for it. We have customers actively developing in ADA, Android, Python, Java, MATLAB, Solaris, and more, just by referring to our complete low-level interface documentation! And we provide the full source code to all of our drivers, regardless of operating system, to give you an even bigger head start in your own development tasks.

No Fees or Royalties

All of this software is provided at no additional charge, and is licensed under any of a variety of flexible — and royalty free — options. Check out our software license explanation if you’d like more information.

Custom Software

ACCES also offers Custom Software Services for our products. Our prices are unbelievably low, often as inexpensive as free! If you need something tweaked to support your needs, or an entire enterprise application developed from scratch, it is definitely worth your time to inquire with us, first.

Further information about available ACCES Software:

Redistributing Windows Drivers
A list of ACCES drivers and the files that compose them under different versions of Windows, so you can easily redistribute ACCES cards and drivers.

Analog Outputs

  • Channels: Eight independent.
  • Type: 12 bits, double-buffered.
  • Non-linearity: ±0.9 LSB maximum.
  • Output Ranges: 0-5V, 0-10V, ±5V.
  • Current Output: 4-20mA (user supplied 5.5-28V).
  • Output Drive: up to 10mA maximum.
  • Drive Capability:
    • RDAG12-8H: 250mA outputs.
  • Output Resistance: 0.5Ω.
  • Monotonicity: ±½ bit.
  • Settling Time: 15usec to ±½LSB for full-scale change of output.

Digital I/O

  • Number of Bits: Seven parallel bits. Each is software configured to be input or output on a bit-by-bit basis.
  • INPUT:Logic Low: -30.0 to +0.8 VDC at -0.4 mA max. Protected to -140VDC
  • INPUT:Logic High: 2.0 to 50.0 VDC (20uA max at 5V in, 5mA max at 50V in)
  • OUTPUT:Logic-Low Sink Current: 350 mA maximum. Inductive-kick suppression diode included in each circuit.
  • OUTPUT:High-Level Output Voltage: Open collector, compliance with up to 50V user-supplied voltage. If no user-supplied voltage exists, outputs are pulled up to +5VDC via 10 kilohm resistors.


  • RDAG12-8
    • Operating Temperature Range: 0° to 65°C. (Optional -40°C to +80°C.)
    • Storage Temperature Range: -20°C to +70°C.
  • RDAG12-8H
    • Operating Temperature Range:0° to 65°C. (Optional -40°C to +80°C.)
    • Storage Temperature Range: -20°C to +70°C.
  • Humidity: 5% to 95% RH, non-condensing. Enclosure is designed to meet NEMA 4 requirements.

Power Required

  • Power for the opto-isolated section can be applied from the computer’s +12 VDC power supply via the serial communications cable, if a four-wire cable is used, or by a local isolated power supply. Power for the rest of the pod can be provided by a local power supply.
  • Opto-Isolated Section: 7.5 to 28 VDC @ 40 mA maximum (7 mA at 12 VDC .)
  • Local Power
    • RDAG12-8
      • 7.5 to 16 VDC at 400 mA (typical).
    • RDAG12-8H
      • 7.5 to 16VDC @ 2.3A
      • -7.5 to -16VDC @ 2.0A

Power Required

  • This product is in full compliance with CE requirements.
ModelDescriptionPrice (USD)

Remote Analog Output Digital I/O Pod


High Current Remote Analog Output Digital I/O Pod