ASYNC GETMODEMINPUT: Difference between revisions

Revision as of 08:31, 12 May 2020

Returns the modem control input signals.

Category: IOCTL_ASYNC (01h)
Function: ASYNC_GETMODEMINPUT (67h)

Parameter Packet Format

None. Packet pointer must be NULL.

Data Packet Format

Field	Length	C Datatype
Modem Control Input Status	BYTE	UCHAR

Modem Control Input 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 0-3: Undefined

Bit 4: Clear To Send (CTS)

Bit 5: Data Set Ready (DSR)

Bit 6: Ring Indicator (RI)

Bit 7: Data Carrier Detect (DCD)

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 input signals of the COM device.

@@ Line 1: / Line 1: @@
-Returns the modem control input signals.
+{{DISPLAYTITLE:ASYNC_GETMODEMINPUT}}
-; Category:IOCTL_ASYNC (01h)
+Returns the modem control input signals.
-; Function:ASYNC_GETMODEMINPUT (67h)
+;Category:IOCTL_ASYNC (01h)
+;Function:ASYNC_GETMODEMINPUT (67h)
 ==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 Input Status||BYTE||UCHAR
-│Modem Control Input Status     BYTE       UCHAR       │
+|}
-└──────────────────────────────────────────────────────┘
-</pre>
-;Modem Control Input 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 0-3 ::Undefined
+;Modem Control Input 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 4 ::Clear To Send (CTS)
+::Bit 0-3: Undefined
-:;Bit 5 ::Data Set Ready (DSR)
+::Bit 4: Clear To Send (CTS)
-:;Bit 6 ::Ring Indicator (RI)
+::Bit 5: Data Set Ready (DSR)
-:;Bit 7 ::Data Carrier Detect (DCD)
+::Bit 6: Ring Indicator (RI)
+::Bit 7: Data Carrier Detect (DCD)
 ==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 input signals of the COM device.
 [[Category:IOCtl Commands]]
-{{DISPLAYTITLE:ASYNC_GETMODEMINPUT (67h)}}