Impulse 3095 - Manual (Page 9)

© Sealevel Systems, Inc. - 7 - REL-16 User Manual
Programming the REL-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 REL-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 3095
specifically. Complete documentation of the API can be found in its accompanying
help file.
Digital I/O Interface
The REL-16 provides two output ports. The ports, which are reed relay output ports,
are organized as ports A and B. Assuming an I/O address of 302 Hex the following
table shows the Port Addresses.
Base Address Hex Decimal Mode
300 768
301 769
Unused
Port A Address 302 770
Port B Address 303 771
Reed Relay Output Port