beautypg.com

Programming the iso-16 – Impulse 3094 User Manual

Page 10

background image

© Sealevel Systems, Inc.

- 8 -

ISO-16 User Manual

Programming the ISO-16

Sealevel’s SeaI/O software is provided to assist in the development of reliable
applications for the Sealevel Systems family of digital I/O adapters. Included on the
SeaI/O CD are driver functions for use in accessing the I/O as well as helpful
samples and utilities.

Programming for Windows

The SeaI/O API (Application Programmer Interface) provides a variety of useful
high-level function calls implemented in a Windows dynamic link library (DLL).
The API is defined in the help file (Start/Programs/SeaIO/SeaIO Help) under
“Application Programmers Interface”. This help file also includes detailed
information dealing with installation / removal of the software and information
about latency, logic states, and device configuration.

For C language programmers we recommend using the API to access the ISO-16. If
you are programming in Visual Basic, using the ActiveX control included with
SeaI/O is advised.

Samples and Utilities

A variety of sample programs and utilities (both executable and source code) are
included with SeaI/O. Further documentation on these samples can be found by
selecting “Start/Programs/SeaIO/Sample Application Description”. Information
about where the files are physically stored on your disk is also included in this same
file.

Programming for Linux

SeaI/O for Linux consists of two major parts: a kernel module

and a library. The

kernel module is a simple IO pass-through device, allowing the library to handle the
more sophisticated functions provided to SeaI/O users. It is provided in a ‘tarball’
format and can easily be compiled and included in the kernel build.

Application Programmers Interface (API)

Most modern operating systems do not allow direct hardware access. The SeaIO
driver and API have been included to provide control over the hardware in Windows
and Linux environments.
The purpose of this section of the manual is to help the customer with the mapping
of the API to the actual inputs and relays for the 3093 specifically. Complete
documentation of the API can be found in its accompanying help file.

Digital I/O Interface

The ISO-16 provides four parallel input/output (I/O) ports. The ports are organized
as ports A, B, C, and D. Port A and B are input ports interfaced to optically-isolated
inputs, while ports C and D are not unused. Assuming an I/O address of 300 Hex the
following table shows the Port Addresses.

Base Address

Hex

Decimal

Mode

Port A Address

300

768

Port B Address

301

769

Optically Isolated Input Port

Port C Address

302

770

Port D Address

303

771

Unused