VIPA CP 1413plus, Руководство пользователя

Страница: 119 / 328

CP1413plus manual Programming
Rev. 00/07 4-13
4.2.2 General H1 Layer 4 functions
The following conditions apply to all functions of the layer 4 interface:
•
All functions for the layer 4 interface have an H1 prefix.
•
The return value of the function is the return value as defined for the respective operating
system for the
DeviceIOCtl
function. Please refer to the documentation of the respective
operating system for a list of possible return values.
•
On a PC user programs may access layer 4 tasks directly. The file H1DEF.H contains a listing
of all the functions.
4.2.2.1 Driver open
#include <H1Def.h>
unsigned short WENTRY_C H1DriverOpen(void)
The
H1DriverOpen
function is used to initialize access to the VIPA H1 driver.
Parameters
None.
Return value
0
H1_NO_DRIVER
H1_NO_ADAPTER
Note
This function must be the first one that is executed. The driver can be closed by
executing the
H1DriverClose
function.
See also
H1DriverClose
H1StopConnectAll