Product category: PC-Compatible Boards and Assemblies
News Release from: Acces I/O Products | Subject: 104-COM-8S and 104-COM-4S
Edited by the Electronicstalk Editorial Team on 23 June 2003
Boards embed four or
eight switchable serial ports
The 104-COM-8S and 104-COM-4S are the latest additions to the line of PC/104 boards from Acces I/O Products
These eight- and four-port, asynchronous, serial communication boards support RS485 and RS422 communications. They are ideal for POS, gaming systems, machine monitoring, military, high-density networking applications and more. The boards may be installed in any standard PC/104 stack. Ports are accessed via a 50-pin IDC-type right-angle connector.
This article was originally published on Electronicstalk on 23 June 2003 at 8.00am (UK)
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For the most economical version, type 16550 UARTs are used.
Optional type 16850 UARTs with 128byte of transmit and receive FIFO may be specified for reducing processor overhead.
Further reading
Digital I/O cards have individually isolated lines
Low-cost PCI isolated digital I/O cards offer a range of 16, 32 or 48 individually optically isolated inputs or outputs
USB board suits many measurement applications
The Model USB-CTR-15 embedded digital counter/timer board is packaged in a small, rugged, industrial enclosure and features 15 independent 16bit counter/timers
The board was designed to protect against lost data in multitasking systems while maintaining 100% compatibility with Windows COM port drivers.
A crystal oscillator located on the board permits precise baud rate capability up to 921.6Kbaud.
Both boards can be operated in two modes.
In the default mode, the base address for the board is selected by jumpers and all the channel addresses are sequential.
Alternately, 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 nonvolatile memory in both modes.
Other features include: an operating temperature range from -40 to +85C; humidity range from 5 to 95% RH, noncondensing; low power consumption of typically 80mA at +5V DC at 80mA; field selectable RS422 or RS485 communications; and interrupt sharing.
A free software package includes sample programs and source code in C and Pascal for DOS, and Windows.
Also included is a graphical option selection setup program in Windows.
An easy-to-use Windows terminal program simplifies verification of proper operation.
Linux support includes basic samples for register-level programming in C.
Full 95/98/Me/NT/2000/XP support and samples are provided for register-level access to the boards' features, as well as kernel mode IRQ operations.
The eight-channel 104-COM-8S is priced at $219, including manual and software, and the four-channel 104-COM-4S is priced at $195.
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