ASYNC SETMODEMCTRL

This function sets the modem control signals.

Category

IOCTL_ASYNC (01h)

Function

ASYNC_SETMODEMCTRL (46h)

Parameter Packet Format

┌──────────────────────────────────────────────────────┐
│Field                          Length     C Datatype  │
├──────────────────────────────────────────────────────┤
│Modem Control Signals ON Mask  BYTE       BYTE        │
├──────────────────────────────────────────────────────┤
│Modem Control Signals OFF Mask BYTE       BYTE        │
└──────────────────────────────────────────────────────┘

Related C Data Structure

The MODEMSTATUS data structure can be used by C programmers.

To include this data structure in your file, make sure INCL_DOSDEVIOCTL is defined before you include OS2.H.

Data Packet Format

┌───────────────────────────────────────────────────┐
│Field                       Length     C Datatype  │
├───────────────────────────────────────────────────┤
│COM Error WORD (COMERR)     WORD       USHORT      │
└───────────────────────────────────────────────────┘

Returns

If the call is made with invalid Parameter Packet values and a general failure error is reported, then the modem control signals are not changed and the Data Packet information returned to the application is undefined.