Omega Vehicle Security OMG-USB-DIO48 - Manual (Page 11)

Programming
OMG-USB-DIO48 Page 7
Programming
Application Programmers Interface (API)
The SeaIO driver, API, and utilities have been included to provide control over
the hardware in Windows environments. The following section is designed to
help the customer understand the API connection to the actual I/O for the OMG-
USB-DIO48. Complete documentation of the API can be found in the SeaI/O
help file.
Presetting an Output Port:
Each port has an output register associated with it. This register may be written
and retains its value whether the port is configured as an input or an output. To
preset the value of an output port the program should writ e to the port when it is
configured as an input then configure it as an output. Inputs cannot be written to
with relative addressing, absolute addressing must be used. Refer to Relative
Addressing vs. Absolute Addressing for more information.
Interrupts:
Interrupt sampling can be set up in the API. Port A1 bit zero (0) is the interrupt
source (pin 47 of P2). Refer to the API section in the SeaI/O help file for more
information.