Comtrol API (6508) for the MS-DOS Bedienungsanleitung PDF herunterladen (Seite 22)

22 API Functions

aaChangeModemState

Changes the state of modem output lines.

aaChangeModemState(Dev,

RTSState,DTRState)

int Dev Device number

int

RTSState State of RTS line: ON, OFF, or

NOCHANGE

int DTRState State of DTR line: ON, OFF, or

NOCHANGE

int: NO_ERR if successful

ERR_DEV if device out of range

Function

Purpose

Call

Return

aaClose

Closes a device.

aaClose(Dev,ModemCtl)

int Dev Device number

unsigned char ModemCtl Modem control lines to turn

OFF, can be

COM_MDM_RTS or

COM_MDM_DTR. If the flag

is not set the state of the

modem line is not changed.

int:

NO_ERR if successful

ERR_DEV if device number out of range

ERR_MDMCTL if invalid modem control flag

ERR_NOTOPEN if device not open

This function waits for the device’s transmit buffer to

drain before completing the close. The maximum wait

time defaults to

CLOSE_TBEDLY, but can be changed

with the aaSetCloseDelay() function.

This function disables and enables interrupts.

Function

Purpose

Call

Return

Comments

Warning

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