User Manual Manual
© Sealevel Systems, Inc. 
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SeaLINK PIO-48 User Manual
Programming the SeaLINK PIO-48 
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 SeaLINK 
PIO-48. 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. 










