Manual 104i-COM-8SM
5
Chapter 1: INTRODUCTION
This communications card interfaces to the CPU through a 32bit PCI bus. It is a PCI-104
card, with no ISA bus connector.
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High Performance Octal PCI UART
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16550 Compatible Register Set
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Up to 921.6kbps Serial Data Rate in all modes
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Global Interrupt Source Register
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Data Transfer in Byte, Word, and Double-Word
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64-Byte Transmit and Receive FIFOs per each of eight UARTs
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Transmit and Receive FIFO Level Counters
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Programmable Transmit and Receive FIFO Trigger Level
Factory Options
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Extended Temperature Operation of -
40˚ to +85˚C
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RoHS Compliance
The 104i-COM-8SM and 104i-COM-4SM (PCI-104) multi-port multi-protocol serial
communication cards deliver eight or four high-speed serial communication ports for use
in a wide variety of applications. The cards were developed for use by system
integrators and manufacturers in the design of industrial and commercial systems.
Based on the XR17D158, the boards have eight enhanced 16550 UARTs, each with a
set of modem signals (CTS, RTS, RI, DTR, DSR, CD) in RS-232 mode. Each UART has
both a 64 byte transmit and a 64 byte receive FIFO.
The provided Windows drivers are 100% compatible with the normal Microsoft-provided
Serial Application Programming Interface. This means every program you've ever used
with a standard serial port in Windows will also work with these ports, no problem. In
addition, we provide several utility and sample programs to help you write your own
code, if you're not using something off-the-shelf.
This serial Interface board contains eight independent ports and provides RS-232, RS-
422 and RS-485 multipoint communication. The -4SM board contains four such ports.
Each channel may be configured to any protocol using jumpers on the board, including
termination.
In RS-232, RS-422 or RS-485 modes, the board can achieve speeds up to 921.6kbps per
port. Use a high-quality cable for best results and to achieve higher baud rates.
