104-COM-8S Eight, Four, and Two Port RS422/RS485 Serial Boards

PC/104 Eight, Four, and Two-Port RS-422/485 Serial Communication

Features

  • 8, 4, or 2 independent asynchronous serial COM ports
  • Field selectable RS-422 and RS-485, independent for each port
  • Auto-RTS feature makes half-duplex RS-485 communications effortless
  • Speeds up to 921.6K
  • Fixed bias and jumper selectable termination provided on each transmit and receive channel simplifies cabling
  • Programmable individual non-volatile base addresses and IRQs simplifies installation
  • Low power required: +5VDC at 80 mA typical
  • Operates as a standard COM port in all operating systems

$119.00$219.00

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Description

These are eight, four, or two-port, asynchronous, serial communication boards designed for use on the PC/104 bus. They support RS-485 and RS-422 communications. The boards may be installed in any standard PC/104 stack. Connections are made via a 50 pin IDC type right angle connector.Common applications include POS, gaming systems, machine monitoring, military and high-density networking.

Type 16550 UARTs are used as the asynchronous communication elements. These include 16-byte transmit/receive FIFO buffers to protect against lost data in multitasking systems while maintaining 100% compatibility with the original IBM serial port.

A crystal oscillator located on the board permits precise baud rate capability up to 115,200. Higher speeds, up to 921.6K, are achieved by installing a jumper on the board. The driver/receivers used, type SN75176, are capable of driving long communication lines at high baud rates. They can drive up to ±60 mA on balanced lines and receive inputs as low as 200 mV differential signal superimposed on common mode noise of +12 to -7V. In case of communication conflict, the driver/receivers feature thermal shutdown.

This board may be operated in two modes. In the Default Mode, the base address for the board is selected by jumpers and all of the channel addresses are sequential. Because it is sometimes difficult to find a large enough block of addresses to permit this approach, an alternative is provided. The addresses and interrupts of the individual channels may be stored in non volatile memory on the board and loaded into programmed logic when the board is initially powered. Individual interrupts for each channel are programmed into the non-volatile memory in both modes.

AUTO TRANSCEIVER CONTROL

In RS-485 multidrop communications individual drivers must be enabled when needed and then disabled after use to permit all ports on the network to share a two-wire or four -wire cable. The 104-COM-8S Series uses an automatic (AUTO) control. The driver is enabled (and the receiver disabled) when data is ready to be transmitted. When transmission is complete, the driver remains enabled for the transmission time of one additional character and then is disabled. This is ideal for use in Windows based applications.

UTILITY SOFTWARE

The 104-COM-8S Series is supported by all operating systems and include a free DOS, Linux and XP -> 10, both 32 & 64 bit compatible software package. This includes sample programs and source code in “C” and Pascal for DOS, and Visual Basic, Delphi, and Visual C++ for Windows. Also included is a graphical setup program in Windows. An easy-to-use Windows terminal program simplifies verification of proper operation.

Factory Options: (call for pricing and availability)

  • 16850 UARTs with 128-byte FIFO
  • 0 to 70°C and -40 to +85°C versions available
  • RoHS Available. Please contact us for ordering information

Downloads

Data Sheets

Manuals

Software


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.

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#, 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

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.

Communications Interface

  • I/O Connections: Via a 50 pin IDC type right angle connector. There are four 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 115.2K baud, asynchronous. A faster range of rates, up to 921.6K, is achieved by jumper selection.
  • Multidrop: Compatible with RS-485 specifications. Up to 32 drivers and receivers allowed on line. Driver/Receivers used are type 75ALS180.
  • Compatible with RS-422 specifications. Up to ten receivers allowed on line.
  • Address: ISA BUS address is set by jumpers on the board. A “Default” jumper determines whether the channel addresses are sequential or loaded from nonvolatile memory on the board.
  • Interrupts: Individual IRQs for each channel are stored onboard in non-volatile memory.
  • Receiver Input Sensitivity: ±200 mV differential input
  • Common Mode Voltage Range: +12V to -7V
  • Transmitter Output Drive Capability: 60 mA with thermal shutdown. Jumper selectable terminations for input and output, by channel, are provided.

Environmental

  • 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
  • Power Required: +5 VDC at 80 mA typical, all outputs open

CE testing & approval must be done at the system level, in the designed enclosure, and is not done on individual boards.

ModelDescriptionPrice (USD)
104-COM-8S

Eight Port RS422/RS485 Serial Board

$219.00
104-COM-4S

Four Port RS422/RS485 Serial Boards

$149.00
104-COM-2S

Two Port RS422/RS485 Serial Boards

$119.00