104-COM232-8 Serial Board
Eight RS-232 ports on PC/104
Features
- 8, 4 or 2 RS-232 asynchronous serial COM ports
- Speeds up to 230.4K with 64-byte FIFO
- Programmable IRQ sharing simplifies system design and installation
- Low power required: +5VDC at 80mA typical
- Operates as a standard COM port in all operating systems
Factory Options: (call for pricing and availability)
- 128-byte FIFO
- 0 to 70°C and -40 to +85°C versions available
- RoHS Available. Please contact us for ordering information
- Designed, made, supported, and manufactured in the USA
Price range: $149.00 through $274.00
In StockDescription
Eight, Four, and Two-Port RS-232 Serial Communication
This is an eight, four, or two-port, asynchronous, serial communication board designed for use on the PC/104 bus. It supports full RS-232 serial communications. The board may be installed in any standard PC/104 stack. Connections are made via two 40 pin IDC type right angle connectors for the boards optional breakout cable. The boards are feature-rich and allow for the connection of multiple serial devices—ideal for a variety of applications such as POS, barcode readers, modems, machine monitoring and control, military, high-density networking applications or any other application requiring the connection of RS-232 serial devices to a PC/104 compatible system. Type 16780 UARTS are used as the asynchronous communication elements. These include 64-byte transmit/receive FIFO buffers to protect against lost data in multitasking systems while maintaining 100% compatibility with all operating system COM port drivers. ACCES offers the 104-COM232-8 series in both standard and extended temperature versions ideal for outdoor applications or harsh industrial surroundings. Ordering options include UARTs with larger FIFOs, support for custom baud rates, vertical I/O pins, and custom cabling.
A crystal oscillator located on the board permits precise baud rate capability up to 230.4K. The addresses of the individual channels and IRQ are stored in non volatile memory on the board and loaded into programmed logic when the board is initially powered.
SOFTWARE
Modified-COTS (MCOTS) Customization
ACCES can tailor any standard product to your precise requirements — electrical, mechanical, firmware, environmental, or connector-level. Common MCOTS options include alternate I/O ranges, isolation enhancements, firmware changes, private labeling, conformal coating, extended temperature operation, ruggedized enclosures, and military-grade components. If this product is close but not a perfect fit, our engineering team can deliver a rapid-turn MCOTS variant with minimal NRE and dependable, Made-in-USA quality.
Downloads
Data Sheets
Manuals
Software
- 104-COM232-8 Software Package ( -- Last Uploaded 2025-05-07)
- 104-COM232-4 Software Package ( -- Last Uploaded 2025-05-07)
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 7 -> 11, 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, 2000, and XP.
Samples
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#, and Delphi, with many devices including samples in Visual Basic (5 and .NET), Visual C/C++, and Borland C/C++ 3.1 for DOS. Additionally we provide National Instruments LabVIEW compatible DLLs and many demonstration VIs for our devices.
Drivers
Drivers for various operating systems are also provided, including active support for Windows 7 -> 11 — 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, Windows 2000, XP, and more, but support for these operating systems is considered deprecated.
Setup Programs and Utilities
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 acquisition 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.
Communications Interface
- I/O Connections: Via two 40 pin IDC type right angle connectors. There are eight pins per port plus common grounds.
- Character Length: 5,6,7, or 8 bits
- Parity: Even, odd, or none
- Stop Interval: 1, 1.5, or 2 bits
- Serial Data Rates: Up to 230.4K baud, asynchronous.
- Common Mode Voltage Range: +12V to -7V
- Base Address Options: Programmable
- Interrupts: Shared IRQ is programmed and stored onboard in non-volatile memory
Environmental
- Short Circuit Protection: All outputs are protected against continuous short circuit
- Power Required: +5 VDC at 80 mA typical, all outputs open
- Operating Temperature: 0 to 70°C, (-40 to +85°C Optional)
- Storage Temperature Range: -50 to +120°C
- Humidity: 5% to 95% RH, non-condensing
- PC/104 bus 8-bit and 16-bit bus headers are used
CE testing & approval must be done at the system level, in the designed enclosure, and is not done on individual boards.
| Model | Description | Price (USD) | |
|---|---|---|---|
| 104-COM232-8 | Eight-Port Serial Communication PC/104 Card | $274.00 | |
| 104-COM232-4 | Four-Port Serial Communication PC/104 Card | $184.00 | |
| 104-COM232-2 | Two-Port Serial Communication PC/104 Card | $149.00 |