ASYNC GETMODEMOUTPUT: Difference between revisions

Revision as of 08:34, 12 May 2020

Returns the modem control output signals.

Category: IOCTL_ASYNC (01h)
Function: ASYNC_GETMODEMOUTPUT (66h)

Parameter Packet Format

None. Packet pointer must be NULL.

Data Packet Format

Field	Length	C Datatype
Modem Control Output Status	BYTE	UCHAR

Modem Control Output Status

If a bit has a value of 1, the condition is on. If a bit has a value of 0, the condition is off.

Bit 0: Data Terminal Ready (DTR)

Bit 1: Request To Send (RTS)

Bits 2-7: Undefined

Returns

If the call is made with an invalid Parameter Packet value, a general failure error is reported and valid information is not returned in the Data Packet.

Remarks

If a general failure error is not returned, the physical device driver returns the current modem control output signals of the COM device.

@@ Line 1: / Line 1: @@
-Returns the modem control output signals.
+{{DISPLAYTITLE:ASYNC_GETMODEMOUTPUT}}
-; Category:IOCTL_ASYNC (01h)
+Returns the modem control output signals.
-; Function:ASYNC_GETMODEMOUTPUT (66h)
+;Category:IOCTL_ASYNC (01h)
+;Function:ASYNC_GETMODEMOUTPUT (66h)
 ==Parameter Packet Format==
 None. Packet pointer must be NULL.
 ==Data Packet Format==
-<pre>
+{|class="wikitable"
-┌──────────────────────────────────────────────────────┐
+!Field||Length||C Datatype
-│Field                          Length     C Datatype  │
+|-
-├──────────────────────────────────────────────────────┤
+|Modem Control Output Status||BYTE||UCHAR
-│Modem Control Output Status    BYTE       UCHAR       │
+|}
-└──────────────────────────────────────────────────────┘
-</pre>
-;Modem Control Output Status
+;Modem Control Output Status:If a bit has a value of 1, the condition is on. If a bit has a value of 0, the condition is off.
-If a bit has a value of 1, the condition is on. If a bit has a value of 0, the condition is off.
+::Bit 0: Data Terminal Ready (DTR)
+::Bit 1: Request To Send (RTS)
-:;Bit 0 ::Data Terminal Ready (DTR)
+::Bits 2-7: Undefined
-:;Bit 1 ::Request To Send (RTS)
-::;Bits 2-7 :::Undefined
 ==Returns==
 If the call is made with an invalid Parameter Packet value, a general failure error is reported and valid information is not returned in the Data Packet.
 ==Remarks==
 If a general failure error is not returned, the physical device driver returns the current modem control output signals of the COM device.
 [[Category:IOCtl Commands]]
-{{DISPLAYTITLE:ASYNC_GETMODEMOUTPUT (66h)}}