ProSoft Technology MVI69-ADM - Manual (Page 249)

MVI-ADM ♦ 'C' Programmable Serial Port Library Functions
'C' Programmable Application Development Module Developer's Guide
ProSoft Technology, Inc. Page 249 of 342
February 20, 2013
MVIsp_GetDCD
Syntax
int MVIsp_GetDCD(int comport, int *state);
Parameters
comport port for which DCD is requested
state pointer to int for desired state
Description
This function allows the state of the DCD signal to be determined. comport must
be previously opened with MVIsp_Open. The current state of the DCD signal is
copied to the int pointed to by state.
Return Value
MVI_SUCCESS the DCD state was read successfully
MVI_ERR_NOACCESS comport has not been opened
MVI_ERR_BADPARAM invalid pointer
Example
int state;
if (MVIsp_GetDCD(COM1, &state) == MVI_SUCCESS)
{
if (state == ON)
printf("DCD is ON\n");
else
printf("DCD is OFF\n");
}