Before you get started, Introduction – Impulse SIO4-104.2+2 (3544) User Manual
Page 3
© Sealevel Systems, Inc.
SL9120 Revision 7/2006
- 1 -
SIO4-104.2+2 User Manual
Introduction
SIO4-104.2+2
The SIO4-104.2+2, Item Number 3544, is a PC/104 module that provides two RS-232 serial
interface ports for Ports 1 and 2 and two RS-422/485 serial interface ports for Ports 3 and 4. The
board is designed using the XR16C554 UART, which provides a 16-byte FIFO.
In addition to the standard XR16C554 UART, the XR16C854 (‘SE’ option) and the OX16C954
(‘SN’ option) are available. Both UARTS feature enhanced FIFOs (128 byte transmit and
receive) and both maintain compatibility with the XR16C554. The OX16C954 additionally
features a flexible clock prescalar (from 1 to 31.875), 9 bit protocol, and an isochronous mode.
The RS-232 compatibility allows for connection to devices utilizing the RS-232 electrical
interface, such as modems, data-entry terminals, and plotters.
RS-422 provides excellent communications for long distance device connections up to 4000ft.,
where noise immunity and high data integrity are essential.
RS-485 is optimized for ‘Multi-Drop’ or ‘Party-line’ operations selecting data from multiple
peripherals (as many as 31 devices can be connected on an RS-485 bus).
The SIO4-104.2+2 is designed to be used with a variety of Operating Systems including
Windows 98/NT/ME/2000/XP, Linux and DOS. The SeaCOM API (Application Programmer
Interface) included on CD with the SIO4-104.2+2 provides a variety of useful high-level function
calls implemented as a Windows dynamic link library (DLL) and as a Linux kernel module and
library. In addition to the API, SeaCOM includes sample code and utilities to simplify software
development.
Other Sealevel PC104 Serial Interface Products
ULTRA SIO-104
(Item Number 3550)
Single Port RS-422/485
SIO-104
(Item Number 3551)
Single Port RS-232
SIO.104+2
(Item Number 3502)
Dual Port RS-232/422/485
C4-104.ULTRA
(Item Number 3540)
Four Port RS-232/422/485
SIO4-104.2+2
(Item Number 3542)
Four Port RS-232
SIO4-104.2+2
(Item Number 3543)
Four Port 422/485