STB-120CH, 50-Pin Multi-Header Universal Screw Terminal Board for up to 120 Digital I/O Channels


  • Screw terminals for up to 120 I/O channels in multiples of 24-bit groups
  • 45 degree angle terminals with captive screws eliminates headaches associated with non-captive style
  • 50-pin male header connectors
  • Specifically designed for use with 24-bit 8255-based digital I/O products from any manufacturer that have grounds on all the even pins and the I/O on the odd pins of a 50-pin connector
  • Pin 49 (connects to +5V of I/O card) breaks out in screw terminal pairs next to the corresponding 50 pin connector
  • A pair of ground pin terminals are located adjacent to the pin 49 terminals for utility usage such as exciting sensors or sourcing current to external devices
  • Silk screen labeling clearly identifies terminal to corresponding connector pin number
  • Screw terminals accept 26 to 12 AWG wire
  • Installed in a steel powder coated enclosure model T-BOX
  • T-BOX is DIN-rail mountable using our MP104-DIN accessory
Last updated on November 2, 2023, 6:29 pm


In Stock


The STB-120CH screw terminal board family allows you to break out signals from an I/O card to screw terminals for easy field signal wiring of relays, sensors and switches commonly found in industrial environments. It features 50 position header connectors and can be used with any I/O card that has a compatible 50 pin mating connector. The STB can be mounted using the provided 4/40 x ½ inch standoffs to a panel or plate. It was designed to be used in rugged industrial environments but is small enough to fit nicely onto any desk or testing station. The board ships inside a steel powder-coated enclosure with an anti-skid bottom. A DIN rail mounting provision is available for installation in industrial environments. Typical mating cables (Model CAB50F-6) are flat ribbon cables used to connect with a variety of ACCES I/O’s digital I/O products.

The STB-120CH is a fully populated board which contains 152 screw terminals with 5-50 pin connectors. This would be ideal for interfacing with our PCI-DIO-120 digital I/O card.

For old-school applications this product is useful with many of our legacy ISA digital I/O products.

Versions with different channel count:

  • STB-DIO48CH  48 Channels
  • STB-DIO72CH  72 Channels
  • STB-DIO96CH  96 Channels


Data Sheets

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.

ModelDescriptionPrice (USD)

120 DIO Screw Terminal Board


48 DIO Screw Terminal Board


72 DIO Screw Terminal Board


96 DIO Screw Terminal Board

CAB50F-6 50-pin ribbon cable with 2 Female connectors. (available in different lengths, contact us)
MP104-DIN DIN rail mounting provision
Options (call for pricing)
-OEM Board Only version (no enclosure )