ProSoft Technology MVI69-ADM - Manual (Page 246)

Serial Port Library Functions MVI-ADM ♦ 'C' Programmable
Developer's Guide 'C' Programmable Application Development Module
Page 246 of 342 ProSoft Technology, Inc.
February 20, 2013
MVIsp_GetDTR
Syntax
int MVIsp_GetDTR(int comport, int *state);
Parameters
comport port for which DTR is requested
state pointer to int for desired state
Description
This function allows the state of the DTR signal to be determined. comport must
be previously opened with MVIsp_Open. The current state of the DTR signal is
copied to the int pointed to by state.
Return Values
MVI_SUCCESS the DTR state was read successfully
MVI_ERR_NOACCESS comport has not been opened
MVI_ERR_BADPARAM invalid pointer
Example
int state;
if (MVIsp_GetDTR(COM1, &state) == MVI_SUCCESS)
{
if (state == ON)
printf("DTR is ON\n");
else
printf("DTR is OFF\n");
}
See Also
MVIsp_SetDTR (page 245)